Weather station: Arduino, DHT11 sensor, Oled display

How to make a mini weather station (temperature, humity monitor) using Arduino, DHT11 sensor and Oled display

Jun 6, 2020

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Components and supplies

SSD1306 OLED 128X64 0.96 inch - I2C

DHT11 Temperature & Humidity Sensor (3 pins)

Jumper wires (generic)

Solderless Breadboard Half Size

Arduino UNO

Apps and platforms

Arduino IDE

Project description

Code

weather station code

c_cpp

1#include "DHT.h"
2#define DHT11Pin 2
3#define DHTType DHT11
4//OLED
5#include   <Wire.h>
6#include <Adafruit_GFX.h>
7#include <Adafruit_SSD1306.h>
8
9DHT   HT(DHT11Pin,DHTType);
10float humi;
11float tempC;
12float tempF;
13
14//OLED   define
15#define SCREEN_WIDTH 128 // OLED display width, in pixels
16#define SCREEN_HEIGHT   64 // OLED display height, in pixels
17// Declaration for an SSD1306 display connected   to I2C (SDA, SCL pins)
18Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,   &Wire, -1);
19
20void setup() {
21  Serial.begin(9600);
22  //For DHT11
23   HT.begin();
24  //For OLED I2C
25  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))   { // Address 0x3D for 128x64
26    Serial.println(F("SSD1306 allocation failed"));
27     for(;;);
28  }
29  display.display(); //Display logo
30  delay(1000); 
31   display.clearDisplay();
32}
33
34void loop() {
35 delay(1000);
36 humi =   HT.readHumidity();
37 tempC = HT.readTemperature();
38 tempF = HT.readTemperature(true);
39
40   Serial.print("Humidity:");
41 Serial.print(humi,0);
42 Serial.print("%");
43   Serial.print(" Temperature:");
44 Serial.print(tempC,1);
45 Serial.print("C   ~ ");
46 Serial.print(tempF,1);
47 Serial.println("F");
48
49 display.clearDisplay();
50   oledDisplayHeader();
51 
52
53 oledDisplay(3,5,28,humi,"%");
54 oledDisplay(2,70,16,tempC,"C");
55   oledDisplay(2,70,44,tempF,"F");
56 
57 display.display(); 
58 
59}
60void   oledDisplayHeader(){
61 display.setTextSize(1);
62 display.setTextColor(WHITE);
63   display.setCursor(0, 0);
64 display.print("Humidity");
65 display.setCursor(60,   0);
66 display.print("Temperature");
67}
68void oledDisplay(int size, int x,int   y, float value, String unit){
69 int charLen=12;
70 int xo=x+charLen*3.2;
71   int xunit=x+charLen*3.6;
72 int xval = x; 
73 display.setTextSize(size);
74 display.setTextColor(WHITE);
75   
76 if (unit=="%"){
77   display.setCursor(x, y);
78   display.print(value,0);
79    display.print(unit);
80 } else {
81   if (value>99){
82    xval=x;
83   }   else {
84    xval=x+charLen;
85   }
86   display.setCursor(xval, y);
87   display.print(value,0);
88    display.drawCircle(xo, y+2, 2, WHITE);  // print degree symbols (  )
89   display.setCursor(xunit,   y);
90   display.print(unit);
91 }
92 
93}
94

#include "DHT.h"
#define DHT11Pin 2
#define DHTType DHT11
//OLED
#include   <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DHT   HT(DHT11Pin,DHTType);
float humi;
float tempC;
float tempF;

//OLED   define
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT   64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected   to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,   &Wire, -1);

void setup() {
  Serial.begin(9600);
  //For DHT11
   HT.begin();
  //For OLED I2C
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))   { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
     for(;;);
  }
  display.display(); //Display logo
  delay(1000); 
   display.clearDisplay();
}

void loop() {
 delay(1000);
 humi =   HT.readHumidity();
 tempC = HT.readTemperature();
 tempF = HT.readTemperature(true);

   Serial.print("Humidity:");
 Serial.print(humi,0);
 Serial.print("%");
   Serial.print(" Temperature:");
 Serial.print(tempC,1);
 Serial.print("C   ~ ");
 Serial.print(tempF,1);
 Serial.println("F");

 display.clearDisplay();
   oledDisplayHeader();
 

 oledDisplay(3,5,28,humi,"%");
 oledDisplay(2,70,16,tempC,"C");
   oledDisplay(2,70,44,tempF,"F");
 
 display.display(); 
 
}
void   oledDisplayHeader(){
 display.setTextSize(1);
 display.setTextColor(WHITE);
   display.setCursor(0, 0);
 display.print("Humidity");
 display.setCursor(60,   0);
 display.print("Temperature");
}
void oledDisplay(int size, int x,int   y, float value, String unit){
 int charLen=12;
 int xo=x+charLen*3.2;
   int xunit=x+charLen*3.6;
 int xval = x; 
 display.setTextSize(size);
 display.setTextColor(WHITE);
   
 if (unit=="%"){
   display.setCursor(x, y);
   display.print(value,0);
    display.print(unit);
 } else {
   if (value>99){
    xval=x;
   }   else {
    xval=x+charLen;
   }
   display.setCursor(xval, y);
   display.print(value,0);
    display.drawCircle(xo, y+2, 2, WHITE);  // print degree symbols (  )
   display.setCursor(xunit,   y);
   display.print(unit);
 }
 
}

weather station code

c_cpp

1#include "DHT.h"
2#define DHT11Pin 2
3#define DHTType DHT11
4//OLED
5#include  <Wire.h>
6#include <Adafruit_GFX.h>
7#include <Adafruit_SSD1306.h>
8
9DHT  HT(DHT11Pin,DHTType);
10float humi;
11float tempC;
12float tempF;
13
14//OLED  define
15#define SCREEN_WIDTH 128 // OLED display width, in pixels
16#define SCREEN_HEIGHT  64 // OLED display height, in pixels
17// Declaration for an SSD1306 display connected  to I2C (SDA, SCL pins)
18Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,  &Wire, -1);
19
20void setup() {
21  Serial.begin(9600);
22  //For DHT11
23  HT.begin();
24  //For OLED I2C
25  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))  { // Address 0x3D for 128x64
26    Serial.println(F("SSD1306 allocation failed"));
27    for(;;);
28  }
29  display.display(); //Display logo
30  delay(1000); 
31  display.clearDisplay();
32}
33
34void loop() {
35 delay(1000);
36 humi =  HT.readHumidity();
37 tempC = HT.readTemperature();
38 tempF = HT.readTemperature(true);
39
40  Serial.print("Humidity:");
41 Serial.print(humi,0);
42 Serial.print("%");
43  Serial.print(" Temperature:");
44 Serial.print(tempC,1);
45 Serial.print("C  ~ ");
46 Serial.print(tempF,1);
47 Serial.println("F");
48
49 display.clearDisplay();
50  oledDisplayHeader();
51 
52
53 oledDisplay(3,5,28,humi,"%");
54 oledDisplay(2,70,16,tempC,"C");
55  oledDisplay(2,70,44,tempF,"F");
56 
57 display.display(); 
58 
59}
60void  oledDisplayHeader(){
61 display.setTextSize(1);
62 display.setTextColor(WHITE);
63  display.setCursor(0, 0);
64 display.print("Humidity");
65 display.setCursor(60,  0);
66 display.print("Temperature");
67}
68void oledDisplay(int size, int x,int  y, float value, String unit){
69 int charLen=12;
70 int xo=x+charLen*3.2;
71  int xunit=x+charLen*3.6;
72 int xval = x; 
73 display.setTextSize(size);
74 display.setTextColor(WHITE);
75  
76 if (unit=="%"){
77   display.setCursor(x, y);
78   display.print(value,0);
79   display.print(unit);
80 } else {
81   if (value>99){
82    xval=x;
83   }  else {
84    xval=x+charLen;
85   }
86   display.setCursor(xval, y);
87   display.print(value,0);
88   display.drawCircle(xo, y+2, 2, WHITE);  // print degree symbols (  )
89   display.setCursor(xunit,  y);
90   display.print(unit);
91 }
92 
93}
94

#include "DHT.h"
#define DHT11Pin 2
#define DHTType DHT11
//OLED
#include  <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DHT  HT(DHT11Pin,DHTType);
float humi;
float tempC;
float tempF;

//OLED  define
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT  64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected  to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,  &Wire, -1);

void setup() {
  Serial.begin(9600);
  //For DHT11
  HT.begin();
  //For OLED I2C
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))  { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display(); //Display logo
  delay(1000); 
  display.clearDisplay();
}

void loop() {
 delay(1000);
 humi =  HT.readHumidity();
 tempC = HT.readTemperature();
 tempF = HT.readTemperature(true);

  Serial.print("Humidity:");
 Serial.print(humi,0);
 Serial.print("%");
  Serial.print(" Temperature:");
 Serial.print(tempC,1);
 Serial.print("C  ~ ");
 Serial.print(tempF,1);
 Serial.println("F");

 display.clearDisplay();
  oledDisplayHeader();
 

 oledDisplay(3,5,28,humi,"%");
 oledDisplay(2,70,16,tempC,"C");
  oledDisplay(2,70,44,tempF,"F");
 
 display.display(); 
 
}
void  oledDisplayHeader(){
 display.setTextSize(1);
 display.setTextColor(WHITE);
  display.setCursor(0, 0);
 display.print("Humidity");
 display.setCursor(60,  0);
 display.print("Temperature");
}
void oledDisplay(int size, int x,int  y, float value, String unit){
 int charLen=12;
 int xo=x+charLen*3.2;
  int xunit=x+charLen*3.6;
 int xval = x; 
 display.setTextSize(size);
 display.setTextColor(WHITE);
  
 if (unit=="%"){
   display.setCursor(x, y);
   display.print(value,0);
   display.print(unit);
 } else {
   if (value>99){
    xval=x;
   }  else {
    xval=x+charLen;
   }
   display.setCursor(xval, y);
   display.print(value,0);
   display.drawCircle(xo, y+2, 2, WHITE);  // print degree symbols (  )
   display.setCursor(xunit,  y);
   display.print(unit);
 }
 
}

Downloadable files

Weather station schematic

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