Beautifully Finished Humidity and Temperature Sensor

We built a stylish and useful humidity and temperature sensor for our home workshop that uses color to alert us to big swings in humidity.

Mar 26, 2018

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94 respects

weather

environmental sensing

art

Components and supplies

Arduino UNO

Jumper wires (generic)

Breadboard (generic)

NeoPixel Ring: WS2812 5050 RGB LED

DHT22 Temperature Sensor

4xAA battery holder

Adafruit 1.44" Color TFT LCD Display with MicroSD Card breakout - ST7735R

Tools and machines

Soldering iron (generic)

Hot glue gun (generic)

Project description

Code

Arduino Work Shop Sensor Code

arduino

1#include <Adafruit_NeoPixel.h>
2#include <Adafruit_ST7735.h>
3#include   <Adafruit_GFX.h>
4#include <FastLED.h>
5#include <SPI.h>
6#include <SD.h>
7#include   <cactus_io_DHT22.h> // There's a bunch of DHTXX libraries you can find online. They   all have varying levels of features.
8
9// Define Pins
10#define TFT_CS    10
11#define   TFT_RST   9
12#define TFT_DC    8
13#define DHT_PIN   2
14#define PIXEL_PIN 6
15#define   PIXEL_NUM 24
16#define SD_PIN    4
17#define BMP_BUF   20  
18
19// Global Variables
20int   currentColor = 9999; //(Numbers correspond to chart. See below.)
21CRGB leds[PIXEL_NUM];
22Adafruit_ST7735    tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
23DHT22 dht(DHT_PIN);
24int   loopDelay = 2000; //ms
25
26// SETUP
27void setup() {
28 
29  Serial.begin(9600);
30   Serial.println("Starting up.");
31
32  // Begin DHT
33  dht.begin();
34
35   // Initialize LCD Screen
36  tft.initR(INITR_144GREENTAB);
37
38  // Initialize   SD Card
39  Serial.print("Initializing SD card.");
40  if (!SD.begin(SD_PIN))   {
41    Serial.println("Failed!");
42    return;
43  }
44
45  // Set Screen   Background to Black
46  tft.fillScreen(ST7735_BLACK);
47
48  // Initialize LEDs
49   FastLED.addLeds<NEOPIXEL, PIXEL_PIN>(leds, PIXEL_NUM);
50
51  // Let everything   catch up before starting loop
52  delay(500);
53
54}
55
56
57// LOOP
58void   loop() {
59
60  // Get Sensor Data
61  dht.readTemperature();
62  dht.readHumidity();
63   int f = dht.temperature_F; // Degrees in Fahrenheit
64  int h = dht.humidity;   // Percentage
65
66  // Draw Degrees Icon
67  tft.fillCircle(102, 42, 6, ST7735_WHITE);
68   tft.fillCircle(102, 42, 4, ST7735_BLACK);
69
70  // Draw Temperature on LCD   Screen
71  drawTemperature(f);
72
73  // Humidity
74  setHumidityColors(h);
75   
76  //Print Data to Serial Monitor
77  Serial.print("Temperature: ");
78   Serial.println(f);
79  Serial.print("Humidity: ");
80  Serial.print(h);
81   Serial.println("%");
82
83  // Delay
84  delay(1000);
85  
86}
87
88
89//   Draw Bitmap - This is for the LCD Screen
90void bmpDraw(char *filename, uint8_t   x, uint8_t y) {
91
92  File     bmpFile;
93  int      bmpWidth, bmpHeight;   //   W+H in pixels
94  uint8_t  bmpDepth;              // Bit depth (currently must   be 24)
95  uint32_t bmpImageoffset;        // Start of image data in file
96  uint32_t   rowSize;               // Not always = bmpWidth; may have padding
97  uint8_t  sdbuffer[3*BMP_BUF];    // pixel buffer (R+G+B per pixel)
98  uint8_t  buffidx = sizeof(sdbuffer); //   Current position in sdbuffer
99  boolean  goodBmp = false;       // Set to true   on valid header parse
100  boolean  flip    = true;        // BMP is stored bottom-to-top
101   int      w, h, row, col;
102  uint8_t  r, g, b;
103  uint32_t pos = 0, startTime   = millis();
104
105  if((x >= tft.width()) || (y >= tft.height())) return;
106
107//   Serial.println();
108//  Serial.print("Loading Bitmap Image: '");
109//  Serial.print(filename);
110//   Serial.println('\\'');
111
112  // Open requested file on SD card
113  if ((bmpFile   = SD.open(filename)) == NULL) {
114    Serial.print("Bitmap file not found!");
115     return;
116  }
117
118  // Parse BMP header
119  if(read16(bmpFile) == 0x4D42)   {
120    read32(bmpFile);
121    (void)read32(bmpFile);
122    bmpImageoffset =   read32(bmpFile);
123    //Serial.println());
124    read32(bmpFile);
125    bmpWidth   = read32(bmpFile);
126    bmpHeight = read32(bmpFile);
127    if(read16(bmpFile)   == 1) {
128      bmpDepth = read16(bmpFile);
129      //Serial.print("Bit Depth:   ");
130      if((bmpDepth == 24) && (read32(bmpFile) == 0)) {
131
132        goodBmp   = true;
133
134        // BMP rows are padded (if needed) to 4-byte boundary
135         rowSize = (bmpWidth * 3 + 3) & ~3;
136
137        // If bmpHeight is negative,   image is in top-down order.
138        // This is not canon but has been observed   in the wild.
139        if(bmpHeight < 0) {
140          bmpHeight = -bmpHeight;
141           flip      = false;
142        }
143
144        // Crop area to be loaded
145         w = bmpWidth;
146        h = bmpHeight;
147        if((x+w-1) >= tft.width())   w = tft.width()  - x;
148        if((y+h-1) >= tft.height()) h = tft.height()   - y;
149
150        // Set TFT address window to clipped image bounds
151        tft.setAddrWindow(x,   y, x+w-1, y+h-1);
152
153        for (row=0; row<h; row++) { // For each scanline...
154           if(flip) {
155            pos = bmpImageoffset + (bmpHeight - 1 - row)   * rowSize;
156          } else {
157            pos = bmpImageoffset + row * rowSize;
158           }
159          if(bmpFile.position() != pos) {
160            bmpFile.seek(pos);
161             buffidx = sizeof(sdbuffer);
162          }
163
164          for (col=0;   col<w; col++) {
165            if (buffidx >= sizeof(sdbuffer)) {
166              bmpFile.read(sdbuffer,   sizeof(sdbuffer));
167              buffidx = 0;
168            }
169
170            //   Convert pixel from BMP to TFT format, push to display
171            b = sdbuffer[buffidx++];
172             g = sdbuffer[buffidx++];
173            r = sdbuffer[buffidx++];
174             tft.pushColor(tft.Color565(r,g,b));
175          }
176        }
177       }
178    }
179  }
180
181  bmpFile.close();
182  if(!goodBmp) Serial.println("BMP   format not recognized.");
183
184}
185
186// This is for the Bitmap/LCD Screen
187uint16_t   read16(File f) {
188  uint16_t result;
189  ((uint8_t *)&result)[0] = f.read();   // LSB
190  ((uint8_t *)&result)[1] = f.read(); // MSB
191  return result;
192}
193
194//   This is for the Bitmap/LCD Screen
195uint32_t read32(File f) {
196  uint32_t result;
197   ((uint8_t *)&result)[0] = f.read(); // LSB
198  ((uint8_t *)&result)[1] = f.read();
199   ((uint8_t *)&result)[2] = f.read();
200  ((uint8_t *)&result)[3] = f.read(); //   MSB
201  return result;
202}
203
204
205// Draw Temperature on LCD Screen
206void   drawTemperature(int temp) {
207
208  // Get Number of Digits in the Temperature
209   int digits = numDigits(temp);
210 
211  // Define Cursor Positions to Draw Bitmaps
212   int x1_2 = 62;
213  int x2_2 = 32;
214  int x1_3 = 1;
215  int x2_3 = 1;
216  int   x3_3 = 1;
217  int y = 38;
218
219  char digit1[12];
220  char digit2[12];
221  char   digit3[12];
222  char digitStr1[24];
223  char digitStr2[24];
224  char digitStr3[24];
225   
226  // Get First Digit
227  itoa(temp % 10, digit1,10); 
228  //Serial.println(temp   % 10);
229  strcpy(digitStr1, "");
230  strcat(digitStr1, digit1);
231  strcat(digitStr1,   ".bmp");
232
233  // Get Second Digit
234  if(digits == 2){
235    itoa((temp   / 10) % 10, digit2,10);
236    strcpy(digitStr2, "");
237    strcat(digitStr2,   digit2);
238    strcat(digitStr2, ".bmp");
239  }
240
241  // Get Third Digit
242   if(digits == 3){
243    itoa((temp / 100) % 10, digit3,10);
244    strcpy(digitStr3,   "");
245    strcat(digitStr3, digit3);
246    strcat(digitStr3, ".bmp");
247   }  
248  
249  if(digits > 2){
250    bmpDraw(digitStr1,x1_3,y);
251    bmpDraw(digitStr2,x2_3,y);
252     bmpDraw(digitStr3,x3_3,y);
253  } else {
254    bmpDraw(digitStr1,x1_2,y);
255     bmpDraw(digitStr2,x2_2,y);
256  }
257
258}
259
260
261// Get number of digits   in temperature to determine placement on screen
262int numDigits(int number){
263
264   int valLen = 0;  
265  if(number > 99)
266    valLen = 3;
267  else
268    valLen   = 2;
269  return valLen;
270
271}
272
273
274// Set LED Colors
275void setColors(int   r, int g, int b){
276
277  for(int i = 0; i < PIXEL_NUM; i++){
278    
279    leds[i].setRGB(   r, g, b);
280    leds[i].fadeLightBy(125);
281    FastLED.show();    
282    delay(100);
283   
284  }
285  
286}
287
288
289// Determine which colors to use based on Humidity   level
290void setHumidityColors(int humidity){
291
292  // Humidity Color Chart   - This is just something we came up with.
293  // Red - 0-17%
294  // Orange - 18-34%
295   // Yellow - 35-51%
296  // Green - 52-68%
297  // Blue - 69-85%
298  // Purple   - 86-100%
299
300  // Define Colors
301  int cRed[3] = {255,0,0};
302  int cOrange[3]   = {255,90,0};
303  int cYellow[3] = {255,255,0};
304  int cGreen[3] = {0,255,0};
305   int cBlue[3] = {0,175,255};
306  int cPurple[3] = {255,0,255};
307
308  int range   = map(humidity, 0, 100, 0, 6);
309  switch (range) {
310    case 0:    // Red
311       if(currentColor == 0){
312        break;
313      }
314      else {
315        setColors(cRed[0],   cRed[1], cRed[2]);
316        currentColor = 0;
317      }
318      break;
319    case   1:    // Orange
320      if(currentColor == 1){
321        break;
322      }
323       else {
324        setColors(cOrange[0], cOrange[1], cOrange[2]);
325        currentColor   = 1;
326      }
327      break;
328    case 2:    // Yellow
329      if(currentColor   == 2){
330        break;
331      }
332      else {
333        setColors(cYellow[0],   cYellow[1], cYellow[2]);
334        currentColor = 2;
335      }
336      break;
337     case 3:    // Green
338      if(currentColor == 3){
339        break;
340      }
341       else {
342        setColors(cGreen[0], cGreen[1], cGreen[2]);
343        currentColor   = 3;
344      }
345      break;
346    case 4:    // Blue
347      if(currentColor   == 4){
348        break;
349      }
350      else {
351        setColors(cBlue[0],   cBlue[1], cBlue[2]);
352        currentColor = 4;
353      }
354      break;
355     case 5:    // Purple
356      if(currentColor == 5){
357        break;
358      }
359       else {
360        setColors(cPurple[0], cPurple[1], cPurple[2]);
361        currentColor   = 5;
362      }      
363      break;
364  }
365}

#include <Adafruit_NeoPixel.h>
#include <Adafruit_ST7735.h>
#include   <Adafruit_GFX.h>
#include <FastLED.h>
#include <SPI.h>
#include <SD.h>
#include   <cactus_io_DHT22.h> // There's a bunch of DHTXX libraries you can find online. They   all have varying levels of features.

// Define Pins
#define TFT_CS    10
#define   TFT_RST   9
#define TFT_DC    8
#define DHT_PIN   2
#define PIXEL_PIN 6
#define   PIXEL_NUM 24
#define SD_PIN    4
#define BMP_BUF   20  

// Global Variables
int   currentColor = 9999; //(Numbers correspond to chart. See below.)
CRGB leds[PIXEL_NUM];
Adafruit_ST7735    tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
DHT22 dht(DHT_PIN);
int   loopDelay = 2000; //ms

// SETUP
void setup() {
 
  Serial.begin(9600);
   Serial.println("Starting up.");

  // Begin DHT
  dht.begin();

   // Initialize LCD Screen
  tft.initR(INITR_144GREENTAB);

  // Initialize   SD Card
  Serial.print("Initializing SD card.");
  if (!SD.begin(SD_PIN))   {
    Serial.println("Failed!");
    return;
  }

  // Set Screen   Background to Black
  tft.fillScreen(ST7735_BLACK);

  // Initialize LEDs
   FastLED.addLeds<NEOPIXEL, PIXEL_PIN>(leds, PIXEL_NUM);

  // Let everything   catch up before starting loop
  delay(500);

}


// LOOP
void   loop() {

  // Get Sensor Data
  dht.readTemperature();
  dht.readHumidity();
   int f = dht.temperature_F; // Degrees in Fahrenheit
  int h = dht.humidity;   // Percentage

  // Draw Degrees Icon
  tft.fillCircle(102, 42, 6, ST7735_WHITE);
   tft.fillCircle(102, 42, 4, ST7735_BLACK);

  // Draw Temperature on LCD   Screen
  drawTemperature(f);

  // Humidity
  setHumidityColors(h);
   
  //Print Data to Serial Monitor
  Serial.print("Temperature: ");
   Serial.println(f);
  Serial.print("Humidity: ");
  Serial.print(h);
   Serial.println("%");

  // Delay
  delay(1000);
  
}


//   Draw Bitmap - This is for the LCD Screen
void bmpDraw(char *filename, uint8_t   x, uint8_t y) {

  File     bmpFile;
  int      bmpWidth, bmpHeight;   //   W+H in pixels
  uint8_t  bmpDepth;              // Bit depth (currently must   be 24)
  uint32_t bmpImageoffset;        // Start of image data in file
  uint32_t   rowSize;               // Not always = bmpWidth; may have padding
  uint8_t  sdbuffer[3*BMP_BUF];    // pixel buffer (R+G+B per pixel)
  uint8_t  buffidx = sizeof(sdbuffer); //   Current position in sdbuffer
  boolean  goodBmp = false;       // Set to true   on valid header parse
  boolean  flip    = true;        // BMP is stored bottom-to-top
   int      w, h, row, col;
  uint8_t  r, g, b;
  uint32_t pos = 0, startTime   = millis();

  if((x >= tft.width()) || (y >= tft.height())) return;

//   Serial.println();
//  Serial.print("Loading Bitmap Image: '");
//  Serial.print(filename);
//   Serial.println('\\'');

  // Open requested file on SD card
  if ((bmpFile   = SD.open(filename)) == NULL) {
    Serial.print("Bitmap file not found!");
     return;
  }

  // Parse BMP header
  if(read16(bmpFile) == 0x4D42)   {
    read32(bmpFile);
    (void)read32(bmpFile);
    bmpImageoffset =   read32(bmpFile);
    //Serial.println());
    read32(bmpFile);
    bmpWidth   = read32(bmpFile);
    bmpHeight = read32(bmpFile);
    if(read16(bmpFile)   == 1) {
      bmpDepth = read16(bmpFile);
      //Serial.print("Bit Depth:   ");
      if((bmpDepth == 24) && (read32(bmpFile) == 0)) {

        goodBmp   = true;

        // BMP rows are padded (if needed) to 4-byte boundary
         rowSize = (bmpWidth * 3 + 3) & ~3;

        // If bmpHeight is negative,   image is in top-down order.
        // This is not canon but has been observed   in the wild.
        if(bmpHeight < 0) {
          bmpHeight = -bmpHeight;
           flip      = false;
        }

        // Crop area to be loaded
         w = bmpWidth;
        h = bmpHeight;
        if((x+w-1) >= tft.width())   w = tft.width()  - x;
        if((y+h-1) >= tft.height()) h = tft.height()   - y;

        // Set TFT address window to clipped image bounds
        tft.setAddrWindow(x,   y, x+w-1, y+h-1);

        for (row=0; row<h; row++) { // For each scanline...
           if(flip) {
            pos = bmpImageoffset + (bmpHeight - 1 - row)   * rowSize;
          } else {
            pos = bmpImageoffset + row * rowSize;
           }
          if(bmpFile.position() != pos) {
            bmpFile.seek(pos);
             buffidx = sizeof(sdbuffer);
          }

          for (col=0;   col<w; col++) {
            if (buffidx >= sizeof(sdbuffer)) {
              bmpFile.read(sdbuffer,   sizeof(sdbuffer));
              buffidx = 0;
            }

            //   Convert pixel from BMP to TFT format, push to display
            b = sdbuffer[buffidx++];
             g = sdbuffer[buffidx++];
            r = sdbuffer[buffidx++];
             tft.pushColor(tft.Color565(r,g,b));
          }
        }
       }
    }
  }

  bmpFile.close();
  if(!goodBmp) Serial.println("BMP   format not recognized.");

}

// This is for the Bitmap/LCD Screen
uint16_t   read16(File f) {
  uint16_t result;
  ((uint8_t *)&result)[0] = f.read();   // LSB
  ((uint8_t *)&result)[1] = f.read(); // MSB
  return result;
}

//   This is for the Bitmap/LCD Screen
uint32_t read32(File f) {
  uint32_t result;
   ((uint8_t *)&result)[0] = f.read(); // LSB
  ((uint8_t *)&result)[1] = f.read();
   ((uint8_t *)&result)[2] = f.read();
  ((uint8_t *)&result)[3] = f.read(); //   MSB
  return result;
}


// Draw Temperature on LCD Screen
void   drawTemperature(int temp) {

  // Get Number of Digits in the Temperature
   int digits = numDigits(temp);
 
  // Define Cursor Positions to Draw Bitmaps
   int x1_2 = 62;
  int x2_2 = 32;
  int x1_3 = 1;
  int x2_3 = 1;
  int   x3_3 = 1;
  int y = 38;

  char digit1[12];
  char digit2[12];
  char   digit3[12];
  char digitStr1[24];
  char digitStr2[24];
  char digitStr3[24];
   
  // Get First Digit
  itoa(temp % 10, digit1,10); 
  //Serial.println(temp   % 10);
  strcpy(digitStr1, "");
  strcat(digitStr1, digit1);
  strcat(digitStr1,   ".bmp");

  // Get Second Digit
  if(digits == 2){
    itoa((temp   / 10) % 10, digit2,10);
    strcpy(digitStr2, "");
    strcat(digitStr2,   digit2);
    strcat(digitStr2, ".bmp");
  }

  // Get Third Digit
   if(digits == 3){
    itoa((temp / 100) % 10, digit3,10);
    strcpy(digitStr3,   "");
    strcat(digitStr3, digit3);
    strcat(digitStr3, ".bmp");
   }  
  
  if(digits > 2){
    bmpDraw(digitStr1,x1_3,y);
    bmpDraw(digitStr2,x2_3,y);
     bmpDraw(digitStr3,x3_3,y);
  } else {
    bmpDraw(digitStr1,x1_2,y);
     bmpDraw(digitStr2,x2_2,y);
  }

}


// Get number of digits   in temperature to determine placement on screen
int numDigits(int number){

   int valLen = 0;  
  if(number > 99)
    valLen = 3;
  else
    valLen   = 2;
  return valLen;

}


// Set LED Colors
void setColors(int   r, int g, int b){

  for(int i = 0; i < PIXEL_NUM; i++){
    
    leds[i].setRGB(   r, g, b);
    leds[i].fadeLightBy(125);
    FastLED.show();    
    delay(100);
   
  }
  
}


// Determine which colors to use based on Humidity   level
void setHumidityColors(int humidity){

  // Humidity Color Chart   - This is just something we came up with.
  // Red - 0-17%
  // Orange - 18-34%
   // Yellow - 35-51%
  // Green - 52-68%
  // Blue - 69-85%
  // Purple   - 86-100%

  // Define Colors
  int cRed[3] = {255,0,0};
  int cOrange[3]   = {255,90,0};
  int cYellow[3] = {255,255,0};
  int cGreen[3] = {0,255,0};
   int cBlue[3] = {0,175,255};
  int cPurple[3] = {255,0,255};

  int range   = map(humidity, 0, 100, 0, 6);
  switch (range) {
    case 0:    // Red
       if(currentColor == 0){
        break;
      }
      else {
        setColors(cRed[0],   cRed[1], cRed[2]);
        currentColor = 0;
      }
      break;
    case   1:    // Orange
      if(currentColor == 1){
        break;
      }
       else {
        setColors(cOrange[0], cOrange[1], cOrange[2]);
        currentColor   = 1;
      }
      break;
    case 2:    // Yellow
      if(currentColor   == 2){
        break;
      }
      else {
        setColors(cYellow[0],   cYellow[1], cYellow[2]);
        currentColor = 2;
      }
      break;
     case 3:    // Green
      if(currentColor == 3){
        break;
      }
       else {
        setColors(cGreen[0], cGreen[1], cGreen[2]);
        currentColor   = 3;
      }
      break;
    case 4:    // Blue
      if(currentColor   == 4){
        break;
      }
      else {
        setColors(cBlue[0],   cBlue[1], cBlue[2]);
        currentColor = 4;
      }
      break;
     case 5:    // Purple
      if(currentColor == 5){
        break;
      }
       else {
        setColors(cPurple[0], cPurple[1], cPurple[2]);
        currentColor   = 5;
      }      
      break;
  }
}

Arduino Work Shop Sensor Code

arduino

1#include <Adafruit_NeoPixel.h>
2#include <Adafruit_ST7735.h>
3#include  <Adafruit_GFX.h>
4#include <FastLED.h>
5#include <SPI.h>
6#include <SD.h>
7#include  <cactus_io_DHT22.h> // There's a bunch of DHTXX libraries you can find online. They  all have varying levels of features.
8
9// Define Pins
10#define TFT_CS    10
11#define  TFT_RST   9
12#define TFT_DC    8
13#define DHT_PIN   2
14#define PIXEL_PIN 6
15#define  PIXEL_NUM 24
16#define SD_PIN    4
17#define BMP_BUF   20  
18
19// Global Variables
20int  currentColor = 9999; //(Numbers correspond to chart. See below.)
21CRGB leds[PIXEL_NUM];
22Adafruit_ST7735   tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
23DHT22 dht(DHT_PIN);
24int  loopDelay = 2000; //ms
25
26// SETUP
27void setup() {
28 
29  Serial.begin(9600);
30  Serial.println("Starting up.");
31
32  // Begin DHT
33  dht.begin();
34
35  // Initialize LCD Screen
36  tft.initR(INITR_144GREENTAB);
37
38  // Initialize  SD Card
39  Serial.print("Initializing SD card.");
40  if (!SD.begin(SD_PIN))  {
41    Serial.println("Failed!");
42    return;
43  }
44
45  // Set Screen  Background to Black
46  tft.fillScreen(ST7735_BLACK);
47
48  // Initialize LEDs
49  FastLED.addLeds<NEOPIXEL, PIXEL_PIN>(leds, PIXEL_NUM);
50
51  // Let everything  catch up before starting loop
52  delay(500);
53
54}
55
56
57// LOOP
58void  loop() {
59
60  // Get Sensor Data
61  dht.readTemperature();
62  dht.readHumidity();
63  int f = dht.temperature_F; // Degrees in Fahrenheit
64  int h = dht.humidity;  // Percentage
65
66  // Draw Degrees Icon
67  tft.fillCircle(102, 42, 6, ST7735_WHITE);
68  tft.fillCircle(102, 42, 4, ST7735_BLACK);
69
70  // Draw Temperature on LCD  Screen
71  drawTemperature(f);
72
73  // Humidity
74  setHumidityColors(h);
75  
76  //Print Data to Serial Monitor
77  Serial.print("Temperature: ");
78  Serial.println(f);
79  Serial.print("Humidity: ");
80  Serial.print(h);
81  Serial.println("%");
82
83  // Delay
84  delay(1000);
85  
86}
87
88
89//  Draw Bitmap - This is for the LCD Screen
90void bmpDraw(char *filename, uint8_t  x, uint8_t y) {
91
92  File     bmpFile;
93  int      bmpWidth, bmpHeight;   //  W+H in pixels
94  uint8_t  bmpDepth;              // Bit depth (currently must  be 24)
95  uint32_t bmpImageoffset;        // Start of image data in file
96  uint32_t  rowSize;               // Not always = bmpWidth; may have padding
97  uint8_t  sdbuffer[3*BMP_BUF];   // pixel buffer (R+G+B per pixel)
98  uint8_t  buffidx = sizeof(sdbuffer); //  Current position in sdbuffer
99  boolean  goodBmp = false;       // Set to true  on valid header parse
100  boolean  flip    = true;        // BMP is stored bottom-to-top
101  int      w, h, row, col;
102  uint8_t  r, g, b;
103  uint32_t pos = 0, startTime  = millis();
104
105  if((x >= tft.width()) || (y >= tft.height())) return;
106
107//  Serial.println();
108//  Serial.print("Loading Bitmap Image: '");
109//  Serial.print(filename);
110//  Serial.println('\\'');
111
112  // Open requested file on SD card
113  if ((bmpFile  = SD.open(filename)) == NULL) {
114    Serial.print("Bitmap file not found!");
115    return;
116  }
117
118  // Parse BMP header
119  if(read16(bmpFile) == 0x4D42)  {
120    read32(bmpFile);
121    (void)read32(bmpFile);
122    bmpImageoffset =  read32(bmpFile);
123    //Serial.println());
124    read32(bmpFile);
125    bmpWidth  = read32(bmpFile);
126    bmpHeight = read32(bmpFile);
127    if(read16(bmpFile)  == 1) {
128      bmpDepth = read16(bmpFile);
129      //Serial.print("Bit Depth:  ");
130      if((bmpDepth == 24) && (read32(bmpFile) == 0)) {
131
132        goodBmp  = true;
133
134        // BMP rows are padded (if needed) to 4-byte boundary
135        rowSize = (bmpWidth * 3 + 3) & ~3;
136
137        // If bmpHeight is negative,  image is in top-down order.
138        // This is not canon but has been observed  in the wild.
139        if(bmpHeight < 0) {
140          bmpHeight = -bmpHeight;
141          flip      = false;
142        }
143
144        // Crop area to be loaded
145        w = bmpWidth;
146        h = bmpHeight;
147        if((x+w-1) >= tft.width())  w = tft.width()  - x;
148        if((y+h-1) >= tft.height()) h = tft.height()  - y;
149
150        // Set TFT address window to clipped image bounds
151        tft.setAddrWindow(x,  y, x+w-1, y+h-1);
152
153        for (row=0; row<h; row++) { // For each scanline...
154          if(flip) {
155            pos = bmpImageoffset + (bmpHeight - 1 - row)  * rowSize;
156          } else {
157            pos = bmpImageoffset + row * rowSize;
158          }
159          if(bmpFile.position() != pos) {
160            bmpFile.seek(pos);
161            buffidx = sizeof(sdbuffer);
162          }
163
164          for (col=0;  col<w; col++) {
165            if (buffidx >= sizeof(sdbuffer)) {
166              bmpFile.read(sdbuffer,  sizeof(sdbuffer));
167              buffidx = 0;
168            }
169
170            //  Convert pixel from BMP to TFT format, push to display
171            b = sdbuffer[buffidx++];
172            g = sdbuffer[buffidx++];
173            r = sdbuffer[buffidx++];
174            tft.pushColor(tft.Color565(r,g,b));
175          }
176        }
177      }
178    }
179  }
180
181  bmpFile.close();
182  if(!goodBmp) Serial.println("BMP  format not recognized.");
183
184}
185
186// This is for the Bitmap/LCD Screen
187uint16_t  read16(File f) {
188  uint16_t result;
189  ((uint8_t *)&result)[0] = f.read();  // LSB
190  ((uint8_t *)&result)[1] = f.read(); // MSB
191  return result;
192}
193
194//  This is for the Bitmap/LCD Screen
195uint32_t read32(File f) {
196  uint32_t result;
197  ((uint8_t *)&result)[0] = f.read(); // LSB
198  ((uint8_t *)&result)[1] = f.read();
199  ((uint8_t *)&result)[2] = f.read();
200  ((uint8_t *)&result)[3] = f.read(); //  MSB
201  return result;
202}
203
204
205// Draw Temperature on LCD Screen
206void  drawTemperature(int temp) {
207
208  // Get Number of Digits in the Temperature
209  int digits = numDigits(temp);
210 
211  // Define Cursor Positions to Draw Bitmaps
212  int x1_2 = 62;
213  int x2_2 = 32;
214  int x1_3 = 1;
215  int x2_3 = 1;
216  int  x3_3 = 1;
217  int y = 38;
218
219  char digit1[12];
220  char digit2[12];
221  char  digit3[12];
222  char digitStr1[24];
223  char digitStr2[24];
224  char digitStr3[24];
225  
226  // Get First Digit
227  itoa(temp % 10, digit1,10); 
228  //Serial.println(temp  % 10);
229  strcpy(digitStr1, "");
230  strcat(digitStr1, digit1);
231  strcat(digitStr1,  ".bmp");
232
233  // Get Second Digit
234  if(digits == 2){
235    itoa((temp  / 10) % 10, digit2,10);
236    strcpy(digitStr2, "");
237    strcat(digitStr2,  digit2);
238    strcat(digitStr2, ".bmp");
239  }
240
241  // Get Third Digit
242  if(digits == 3){
243    itoa((temp / 100) % 10, digit3,10);
244    strcpy(digitStr3,  "");
245    strcat(digitStr3, digit3);
246    strcat(digitStr3, ".bmp");
247  }  
248  
249  if(digits > 2){
250    bmpDraw(digitStr1,x1_3,y);
251    bmpDraw(digitStr2,x2_3,y);
252    bmpDraw(digitStr3,x3_3,y);
253  } else {
254    bmpDraw(digitStr1,x1_2,y);
255    bmpDraw(digitStr2,x2_2,y);
256  }
257
258}
259
260
261// Get number of digits  in temperature to determine placement on screen
262int numDigits(int number){
263
264  int valLen = 0;  
265  if(number > 99)
266    valLen = 3;
267  else
268    valLen  = 2;
269  return valLen;
270
271}
272
273
274// Set LED Colors
275void setColors(int  r, int g, int b){
276
277  for(int i = 0; i < PIXEL_NUM; i++){
278    
279    leds[i].setRGB(  r, g, b);
280    leds[i].fadeLightBy(125);
281    FastLED.show();    
282    delay(100);
283  
284  }
285  
286}
287
288
289// Determine which colors to use based on Humidity  level
290void setHumidityColors(int humidity){
291
292  // Humidity Color Chart  - This is just something we came up with.
293  // Red - 0-17%
294  // Orange - 18-34%
295  // Yellow - 35-51%
296  // Green - 52-68%
297  // Blue - 69-85%
298  // Purple  - 86-100%
299
300  // Define Colors
301  int cRed[3] = {255,0,0};
302  int cOrange[3]  = {255,90,0};
303  int cYellow[3] = {255,255,0};
304  int cGreen[3] = {0,255,0};
305  int cBlue[3] = {0,175,255};
306  int cPurple[3] = {255,0,255};
307
308  int range  = map(humidity, 0, 100, 0, 6);
309  switch (range) {
310    case 0:    // Red
311      if(currentColor == 0){
312        break;
313      }
314      else {
315        setColors(cRed[0],  cRed[1], cRed[2]);
316        currentColor = 0;
317      }
318      break;
319    case  1:    // Orange
320      if(currentColor == 1){
321        break;
322      }
323      else {
324        setColors(cOrange[0], cOrange[1], cOrange[2]);
325        currentColor  = 1;
326      }
327      break;
328    case 2:    // Yellow
329      if(currentColor  == 2){
330        break;
331      }
332      else {
333        setColors(cYellow[0],  cYellow[1], cYellow[2]);
334        currentColor = 2;
335      }
336      break;
337    case 3:    // Green
338      if(currentColor == 3){
339        break;
340      }
341      else {
342        setColors(cGreen[0], cGreen[1], cGreen[2]);
343        currentColor  = 3;
344      }
345      break;
346    case 4:    // Blue
347      if(currentColor  == 4){
348        break;
349      }
350      else {
351        setColors(cBlue[0],  cBlue[1], cBlue[2]);
352        currentColor = 4;
353      }
354      break;
355    case 5:    // Purple
356      if(currentColor == 5){
357        break;
358      }
359      else {
360        setColors(cPurple[0], cPurple[1], cPurple[2]);
361        currentColor  = 5;
362      }      
363      break;
364  }
365}

#include <Adafruit_NeoPixel.h>
#include <Adafruit_ST7735.h>
#include  <Adafruit_GFX.h>
#include <FastLED.h>
#include <SPI.h>
#include <SD.h>
#include  <cactus_io_DHT22.h> // There's a bunch of DHTXX libraries you can find online. They  all have varying levels of features.

// Define Pins
#define TFT_CS    10
#define  TFT_RST   9
#define TFT_DC    8
#define DHT_PIN   2
#define PIXEL_PIN 6
#define  PIXEL_NUM 24
#define SD_PIN    4
#define BMP_BUF   20  

// Global Variables
int  currentColor = 9999; //(Numbers correspond to chart. See below.)
CRGB leds[PIXEL_NUM];
Adafruit_ST7735   tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
DHT22 dht(DHT_PIN);
int  loopDelay = 2000; //ms

// SETUP
void setup() {
 
  Serial.begin(9600);
  Serial.println("Starting up.");

  // Begin DHT
  dht.begin();

  // Initialize LCD Screen
  tft.initR(INITR_144GREENTAB);

  // Initialize  SD Card
  Serial.print("Initializing SD card.");
  if (!SD.begin(SD_PIN))  {
    Serial.println("Failed!");
    return;
  }

  // Set Screen  Background to Black
  tft.fillScreen(ST7735_BLACK);

  // Initialize LEDs
  FastLED.addLeds<NEOPIXEL, PIXEL_PIN>(leds, PIXEL_NUM);

  // Let everything  catch up before starting loop
  delay(500);

}


// LOOP
void  loop() {

  // Get Sensor Data
  dht.readTemperature();
  dht.readHumidity();
  int f = dht.temperature_F; // Degrees in Fahrenheit
  int h = dht.humidity;  // Percentage

  // Draw Degrees Icon
  tft.fillCircle(102, 42, 6, ST7735_WHITE);
  tft.fillCircle(102, 42, 4, ST7735_BLACK);

  // Draw Temperature on LCD  Screen
  drawTemperature(f);

  // Humidity
  setHumidityColors(h);
  
  //Print Data to Serial Monitor
  Serial.print("Temperature: ");
  Serial.println(f);
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println("%");

  // Delay
  delay(1000);
  
}


//  Draw Bitmap - This is for the LCD Screen
void bmpDraw(char *filename, uint8_t  x, uint8_t y) {

  File     bmpFile;
  int      bmpWidth, bmpHeight;   //  W+H in pixels
  uint8_t  bmpDepth;              // Bit depth (currently must  be 24)
  uint32_t bmpImageoffset;        // Start of image data in file
  uint32_t  rowSize;               // Not always = bmpWidth; may have padding
  uint8_t  sdbuffer[3*BMP_BUF];   // pixel buffer (R+G+B per pixel)
  uint8_t  buffidx = sizeof(sdbuffer); //  Current position in sdbuffer
  boolean  goodBmp = false;       // Set to true  on valid header parse
  boolean  flip    = true;        // BMP is stored bottom-to-top
  int      w, h, row, col;
  uint8_t  r, g, b;
  uint32_t pos = 0, startTime  = millis();

  if((x >= tft.width()) || (y >= tft.height())) return;

//  Serial.println();
//  Serial.print("Loading Bitmap Image: '");
//  Serial.print(filename);
//  Serial.println('\\'');

  // Open requested file on SD card
  if ((bmpFile  = SD.open(filename)) == NULL) {
    Serial.print("Bitmap file not found!");
    return;
  }

  // Parse BMP header
  if(read16(bmpFile) == 0x4D42)  {
    read32(bmpFile);
    (void)read32(bmpFile);
    bmpImageoffset =  read32(bmpFile);
    //Serial.println());
    read32(bmpFile);
    bmpWidth  = read32(bmpFile);
    bmpHeight = read32(bmpFile);
    if(read16(bmpFile)  == 1) {
      bmpDepth = read16(bmpFile);
      //Serial.print("Bit Depth:  ");
      if((bmpDepth == 24) && (read32(bmpFile) == 0)) {

        goodBmp  = true;

        // BMP rows are padded (if needed) to 4-byte boundary
        rowSize = (bmpWidth * 3 + 3) & ~3;

        // If bmpHeight is negative,  image is in top-down order.
        // This is not canon but has been observed  in the wild.
        if(bmpHeight < 0) {
          bmpHeight = -bmpHeight;
          flip      = false;
        }

        // Crop area to be loaded
        w = bmpWidth;
        h = bmpHeight;
        if((x+w-1) >= tft.width())  w = tft.width()  - x;
        if((y+h-1) >= tft.height()) h = tft.height()  - y;

        // Set TFT address window to clipped image bounds
        tft.setAddrWindow(x,  y, x+w-1, y+h-1);

        for (row=0; row<h; row++) { // For each scanline...
          if(flip) {
            pos = bmpImageoffset + (bmpHeight - 1 - row)  * rowSize;
          } else {
            pos = bmpImageoffset + row * rowSize;
          }
          if(bmpFile.position() != pos) {
            bmpFile.seek(pos);
            buffidx = sizeof(sdbuffer);
          }

          for (col=0;  col<w; col++) {
            if (buffidx >= sizeof(sdbuffer)) {
              bmpFile.read(sdbuffer,  sizeof(sdbuffer));
              buffidx = 0;
            }

            //  Convert pixel from BMP to TFT format, push to display
            b = sdbuffer[buffidx++];
            g = sdbuffer[buffidx++];
            r = sdbuffer[buffidx++];
            tft.pushColor(tft.Color565(r,g,b));
          }
        }
      }
    }
  }

  bmpFile.close();
  if(!goodBmp) Serial.println("BMP  format not recognized.");

}

// This is for the Bitmap/LCD Screen
uint16_t  read16(File f) {
  uint16_t result;
  ((uint8_t *)&result)[0] = f.read();  // LSB
  ((uint8_t *)&result)[1] = f.read(); // MSB
  return result;
}

//  This is for the Bitmap/LCD Screen
uint32_t read32(File f) {
  uint32_t result;
  ((uint8_t *)&result)[0] = f.read(); // LSB
  ((uint8_t *)&result)[1] = f.read();
  ((uint8_t *)&result)[2] = f.read();
  ((uint8_t *)&result)[3] = f.read(); //  MSB
  return result;
}


// Draw Temperature on LCD Screen
void  drawTemperature(int temp) {

  // Get Number of Digits in the Temperature
  int digits = numDigits(temp);
 
  // Define Cursor Positions to Draw Bitmaps
  int x1_2 = 62;
  int x2_2 = 32;
  int x1_3 = 1;
  int x2_3 = 1;
  int  x3_3 = 1;
  int y = 38;

  char digit1[12];
  char digit2[12];
  char  digit3[12];
  char digitStr1[24];
  char digitStr2[24];
  char digitStr3[24];
  
  // Get First Digit
  itoa(temp % 10, digit1,10); 
  //Serial.println(temp  % 10);
  strcpy(digitStr1, "");
  strcat(digitStr1, digit1);
  strcat(digitStr1,  ".bmp");

  // Get Second Digit
  if(digits == 2){
    itoa((temp  / 10) % 10, digit2,10);
    strcpy(digitStr2, "");
    strcat(digitStr2,  digit2);
    strcat(digitStr2, ".bmp");
  }

  // Get Third Digit
  if(digits == 3){
    itoa((temp / 100) % 10, digit3,10);
    strcpy(digitStr3,  "");
    strcat(digitStr3, digit3);
    strcat(digitStr3, ".bmp");
  }  
  
  if(digits > 2){
    bmpDraw(digitStr1,x1_3,y);
    bmpDraw(digitStr2,x2_3,y);
    bmpDraw(digitStr3,x3_3,y);
  } else {
    bmpDraw(digitStr1,x1_2,y);
    bmpDraw(digitStr2,x2_2,y);
  }

}


// Get number of digits  in temperature to determine placement on screen
int numDigits(int number){

  int valLen = 0;  
  if(number > 99)
    valLen = 3;
  else
    valLen  = 2;
  return valLen;

}


// Set LED Colors
void setColors(int  r, int g, int b){

  for(int i = 0; i < PIXEL_NUM; i++){
    
    leds[i].setRGB(  r, g, b);
    leds[i].fadeLightBy(125);
    FastLED.show();    
    delay(100);
  
  }
  
}


// Determine which colors to use based on Humidity  level
void setHumidityColors(int humidity){

  // Humidity Color Chart  - This is just something we came up with.
  // Red - 0-17%
  // Orange - 18-34%
  // Yellow - 35-51%
  // Green - 52-68%
  // Blue - 69-85%
  // Purple  - 86-100%

  // Define Colors
  int cRed[3] = {255,0,0};
  int cOrange[3]  = {255,90,0};
  int cYellow[3] = {255,255,0};
  int cGreen[3] = {0,255,0};
  int cBlue[3] = {0,175,255};
  int cPurple[3] = {255,0,255};

  int range  = map(humidity, 0, 100, 0, 6);
  switch (range) {
    case 0:    // Red
      if(currentColor == 0){
        break;
      }
      else {
        setColors(cRed[0],  cRed[1], cRed[2]);
        currentColor = 0;
      }
      break;
    case  1:    // Orange
      if(currentColor == 1){
        break;
      }
      else {
        setColors(cOrange[0], cOrange[1], cOrange[2]);
        currentColor  = 1;
      }
      break;
    case 2:    // Yellow
      if(currentColor  == 2){
        break;
      }
      else {
        setColors(cYellow[0],  cYellow[1], cYellow[2]);
        currentColor = 2;
      }
      break;
    case 3:    // Green
      if(currentColor == 3){
        break;
      }
      else {
        setColors(cGreen[0], cGreen[1], cGreen[2]);
        currentColor  = 3;
      }
      break;
    case 4:    // Blue
      if(currentColor  == 4){
        break;
      }
      else {
        setColors(cBlue[0],  cBlue[1], cBlue[2]);
        currentColor = 4;
      }
      break;
    case 5:    // Purple
      if(currentColor == 5){
        break;
      }
      else {
        setColors(cPurple[0], cPurple[1], cPurple[2]);
        currentColor  = 5;
      }      
      break;
  }
}

Downloadable files

Picture of Actual Setup

Schematic

Fritzing didn't have most of the actual components so I did my best to represent the flow of things.

Schematic

Picture of Actual Setup

Documentation

Arduino Work Shop Sensor Plans

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