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https://github.com/adafruit/DHT-sensor-library.git
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74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// Example testing sketch for various DHT humidity/temperature sensors
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// Written by ladyada, public domain
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// REQUIRES the following Arduino libraries:
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// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
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// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
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#include "DHT.h"
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#define DHTPIN 2 // Digital pin connected to the DHT sensor
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// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
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// Pin 15 can work but DHT must be disconnected during program upload.
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// Uncomment whatever type you're using!
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//#define DHTTYPE DHT11 // DHT 11
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#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
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//#define DHTTYPE DHT21 // DHT 21 (AM2301)
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// Connect pin 1 (on the left) of the sensor to +5V
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// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
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// to 3.3V instead of 5V!
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// Connect pin 2 of the sensor to whatever your DHTPIN is
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// Connect pin 4 (on the right) of the sensor to GROUND
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// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
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// Initialize DHT sensor.
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// Note that older versions of this library took an optional third parameter to
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// tweak the timings for faster processors. This parameter is no longer needed
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// as the current DHT reading algorithm adjusts itself to work on faster procs.
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DHT dht(DHTPIN, DHTTYPE);
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void setup() {
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Serial.begin(9600);
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Serial.println(F("DHTxx test!"));
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dht.begin();
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}
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void loop() {
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// Wait a few seconds between measurements.
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delay(2000);
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// Reading temperature or humidity takes about 250 milliseconds!
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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float h = dht.readHumidity();
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// Read temperature as Celsius (the default)
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float t = dht.readTemperature();
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// Read temperature as Fahrenheit (isFahrenheit = true)
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float f = dht.readTemperature(true);
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// Check if any reads failed and exit early (to try again).
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if (isnan(h) || isnan(t) || isnan(f)) {
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Serial.println(F("Failed to read from DHT sensor!"));
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return;
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}
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// Compute heat index in Fahrenheit (the default)
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float hif = dht.computeHeatIndex(f, h);
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// Compute heat index in Celsius (isFahreheit = false)
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float hic = dht.computeHeatIndex(t, h, false);
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Serial.print(F("Humidity: "));
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Serial.print(h);
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Serial.print(F("% Temperature: "));
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Serial.print(t);
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Serial.print(F("°C "));
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Serial.print(f);
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Serial.print(F("°F Heat index: "));
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Serial.print(hic);
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Serial.print(F("°C "));
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Serial.print(hif);
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Serial.println(F("°F"));
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}
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