Arduino+LCD1602/I2C+DHT11 hygrothermograph thermometer

1// Example testing sketch for various DHT humidity/temperature sensors
2//  Written by ladyada, public domain
3
4// REQUIRES the following Arduino libraries:
5//  - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
6// - Adafruit  Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
7
8#include  "DHT.h"
9
10#define DHTPIN 2     // Digital pin connected to the DHT sensor
11//  Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
12// Pin 15 can  work but DHT must be disconnected during program upload.
13
14// Uncomment whatever  type you're using!
15//#define DHTTYPE DHT11   // DHT 11
16#define DHTTYPE DHT11   // DHT 22  (AM2302), AM2321
17//#define DHTTYPE DHT21   // DHT 21 (AM2301)
18#include  <LiquidCrystal_I2C.h>
19
20LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address  to 0x27 for a 16 chars and 2 line display
21
22// Connect pin 1 (on the left)  of the sensor to +5V
23// NOTE: If using a board with 3.3V logic like an Arduino  Due connect pin 1
24// to 3.3V instead of 5V!
25// Connect pin 2 of the sensor  to whatever your DHTPIN is
26// Connect pin 4 (on the right) of the sensor to GROUND
27//  Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
28
29//  Initialize DHT sensor.
30// Note that older versions of this library took an optional  third parameter to
31// tweak the timings for faster processors.  This parameter  is no longer needed
32// as the current DHT reading algorithm adjusts itself to  work on faster procs.
33DHT dht(DHTPIN, DHTTYPE);
34
35void setup() {
36  lcd.init();                      // initialize the lcd 
37  lcd.backlight();
38  lcd.print("Small  Hammer");
39  Serial.begin(9600);
40  Serial.println(F("DHTxx test!"));
41
42  dht.begin();
43}
44
45void loop() {
46  // Wait a few seconds between measurements.
47  delay(2000);
48
49  // Reading temperature or humidity takes about 250 milliseconds!
50  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
51  float h = dht.readHumidity();
52  // Read temperature as Celsius (the default)
53  float t = dht.readTemperature();
54  // Read temperature as Fahrenheit (isFahrenheit  = true)
55  float f = dht.readTemperature(true);
56
57  // Check if any reads  failed and exit early (to try again).
58  if (isnan(h) || isnan(t) || isnan(f))  {
59    Serial.println(F("Failed to read from DHT sensor!"));
60    return;
61  }
62
63  // Compute heat index in Fahrenheit (the default)
64  float hif =  dht.computeHeatIndex(f, h);
65  // Compute heat index in Celsius (isFahreheit =  false)
66  float hic = dht.computeHeatIndex(t, h, false);
67
68  Serial.print(F("Humidity:  "));
69  Serial.print(h);
70  Serial.print(F("%  Temperature: "));
71  Serial.print(t);
72  Serial.print(F("C "));
73  Serial.print(f);
74  Serial.print(F("F  Heat index:  "));
75  Serial.print(hic);
76  Serial.print(F("C "));
77  Serial.print(hif);
78  Serial.println(F("F"));
79     lcd.setCursor(0, 0);
80                lcd.print("Temp:");
81                lcd.print(t);
82                
83                lcd.write(0xDF);
84                lcd.print("C");
85 
86                lcd.setCursor(0, 1);
87                lcd.print("Humidity:");
88             lcd.print(f);
89                lcd.print("%");
90}
91

1// Example testing sketch for various DHT humidity/temperature sensors
2//
3  Written by ladyada, public domain
4
5// REQUIRES the following Arduino libraries:
6//
7  - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
8// - Adafruit
9  Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
10
11#include
12  "DHT.h"
13
14#define DHTPIN 2     // Digital pin connected to the DHT sensor
15//
16  Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
17// Pin 15 can
18  work but DHT must be disconnected during program upload.
19
20// Uncomment whatever
21  type you're using!
22//#define DHTTYPE DHT11   // DHT 11
23#define DHTTYPE DHT11
24   // DHT 22  (AM2302), AM2321
25//#define DHTTYPE DHT21   // DHT 21 (AM2301)
26#include
27  <LiquidCrystal_I2C.h>
28
29LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address
30  to 0x27 for a 16 chars and 2 line display
31
32// Connect pin 1 (on the left)
33  of the sensor to +5V
34// NOTE: If using a board with 3.3V logic like an Arduino
35  Due connect pin 1
36// to 3.3V instead of 5V!
37// Connect pin 2 of the sensor
38  to whatever your DHTPIN is
39// Connect pin 4 (on the right) of the sensor to GROUND
40//
41  Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
42
43//
44  Initialize DHT sensor.
45// Note that older versions of this library took an optional
46  third parameter to
47// tweak the timings for faster processors.  This parameter
48  is no longer needed
49// as the current DHT reading algorithm adjusts itself to
50  work on faster procs.
51DHT dht(DHTPIN, DHTTYPE);
52
53void setup() {
54  lcd.init();
55                      // initialize the lcd 
56  lcd.backlight();
57  lcd.print("Small
58  Hammer");
59  Serial.begin(9600);
60  Serial.println(F("DHTxx test!"));
61
62
63  dht.begin();
64}
65
66void loop() {
67  // Wait a few seconds between measurements.
68
69  delay(2000);
70
71  // Reading temperature or humidity takes about 250 milliseconds!
72
73  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
74
75  float h = dht.readHumidity();
76  // Read temperature as Celsius (the default)
77
78  float t = dht.readTemperature();
79  // Read temperature as Fahrenheit (isFahrenheit
80  = true)
81  float f = dht.readTemperature(true);
82
83  // Check if any reads
84  failed and exit early (to try again).
85  if (isnan(h) || isnan(t) || isnan(f))
86  {
87    Serial.println(F("Failed to read from DHT sensor!"));
88    return;
89
90  }
91
92  // Compute heat index in Fahrenheit (the default)
93  float hif =
94  dht.computeHeatIndex(f, h);
95  // Compute heat index in Celsius (isFahreheit =
96  false)
97  float hic = dht.computeHeatIndex(t, h, false);
98
99  Serial.print(F("Humidity:
100  "));
101  Serial.print(h);
102  Serial.print(F("%  Temperature: "));
103  Serial.print(t);
104
105  Serial.print(F("C "));
106  Serial.print(f);
107  Serial.print(F("F  Heat index:
108  "));
109  Serial.print(hic);
110  Serial.print(F("C "));
111  Serial.print(hif);
112
113  Serial.println(F("F"));
114     lcd.setCursor(0, 0);
115                lcd.print("Temp:");
116
117                lcd.print(t);
118                
119                lcd.write(0xDF);
120
121                lcd.print("C");
122 
123                lcd.setCursor(0, 1);
124
125                lcd.print("Humidity:");
126             lcd.print(f);
127                lcd.print("%");
128}
129