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DHTtest sample

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  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 DHT22   // DHT 22  (AM2302), AM2321
  17. //#define DHTTYPE DHT21   // DHT 21 (AM2301)
  18.  
  19. // Connect pin 1 (on the left) of the sensor to +5V
  20. // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
  21. // to 3.3V instead of 5V!
  22. // Connect pin 2 of the sensor to whatever your DHTPIN is
  23. // Connect pin 4 (on the right) of the sensor to GROUND
  24. // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
  25.  
  26. // Initialize DHT sensor.
  27. // Note that older versions of this library took an optional third parameter to
  28. // tweak the timings for faster processors.  This parameter is no longer needed
  29. // as the current DHT reading algorithm adjusts itself to work on faster procs.
  30. DHT dht(DHTPIN, DHTTYPE);
  31.  
  32. void setup() {
  33.   Serial.begin(9600);
  34.   Serial.println(F("DHTxx test!"));
  35.  
  36.   dht.begin();
  37. }
  38.  
  39. void loop() {
  40.   // Wait a few seconds between measurements.
  41.   delay(2000);
  42.  
  43.   // Reading temperature or humidity takes about 250 milliseconds!
  44.   // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  45.   float h = dht.readHumidity();
  46.   // Read temperature as Celsius (the default)
  47.   float t = dht.readTemperature();
  48.   // Read temperature as Fahrenheit (isFahrenheit = true)
  49.   float f = dht.readTemperature(true);
  50.  
  51.   // Check if any reads failed and exit early (to try again).
  52.   if (isnan(h) || isnan(t) || isnan(f)) {
  53.     Serial.println(F("Failed to read from DHT sensor!"));
  54.     return;
  55.   }
  56.  
  57.   // Compute heat index in Fahrenheit (the default)
  58.   float hif = dht.computeHeatIndex(f, h);
  59.   // Compute heat index in Celsius (isFahreheit = false)
  60.   float hic = dht.computeHeatIndex(t, h, false);
  61.  
  62.   Serial.print(F("Humidity: "));
  63.   Serial.print(h);
  64.   Serial.print(F("%  Temperature: "));
  65.   Serial.print(t);
  66.   Serial.print(F("°C "));
  67.   Serial.print(f);
  68.   Serial.print(F("°F  Heat index: "));
  69.   Serial.print(hic);
  70.   Serial.print(F("°C "));
  71.   Serial.print(hif);
  72.   Serial.println(F("°F"));
  73. }
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