mirror of
https://github.com/adafruit/DHT-sensor-library.git
synced 2023-10-23 22:20:38 +03:00
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// Example testing sketch for various DHT humidity/temperature sensors
|
|
// Written by ladyada, public domain
|
|
|
|
#include "DHT.h"
|
|
|
|
#define DHTPIN 2 // what digital pin we're connected to
|
|
|
|
// Uncomment whatever type you're using!
|
|
//#define DHTTYPE DHT11 // DHT 11
|
|
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
|
|
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
|
|
|
|
// Connect pin 1 (on the left) of the sensor to +5V
|
|
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
|
|
// to 3.3V instead of 5V!
|
|
// Connect pin 2 of the sensor to whatever your DHTPIN is
|
|
// Connect pin 4 (on the right) of the sensor to GROUND
|
|
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
|
|
|
|
// Initialize DHT sensor.
|
|
// Note that older versions of this library took an optional third parameter to
|
|
// tweak the timings for faster processors. This parameter is no longer needed
|
|
// as the current DHT reading algorithm adjusts itself to work on faster procs.
|
|
DHT dht(DHTPIN, DHTTYPE);
|
|
|
|
void setup() {
|
|
Serial.begin(9600);
|
|
Serial.println(F("DHTxx test!"));
|
|
|
|
dht.begin();
|
|
}
|
|
|
|
void loop() {
|
|
// Wait a few seconds between measurements.
|
|
delay(2000);
|
|
|
|
// Reading temperature or humidity takes about 250 milliseconds!
|
|
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
|
|
float h = dht.readHumidity();
|
|
// Read temperature as Celsius (the default)
|
|
float t = dht.readTemperature();
|
|
// Read temperature as Fahrenheit (isFahrenheit = true)
|
|
float f = dht.readTemperature(true);
|
|
|
|
// Check if any reads failed and exit early (to try again).
|
|
if (isnan(h) || isnan(t) || isnan(f)) {
|
|
Serial.println(F("Failed to read from DHT sensor!"));
|
|
return;
|
|
}
|
|
|
|
// Compute heat index in Fahrenheit (the default)
|
|
float hif = dht.computeHeatIndex(f, h);
|
|
// Compute heat index in Celsius (isFahreheit = false)
|
|
float hic = dht.computeHeatIndex(t, h, false);
|
|
|
|
Serial.print(F("Humidity: "));
|
|
Serial.print(h);
|
|
Serial.print(F("% Temperature: "));
|
|
Serial.print(t);
|
|
Serial.print(F("°C "));
|
|
Serial.print(f);
|
|
Serial.print(F("°F Heat index: "));
|
|
Serial.print(hic);
|
|
Serial.print(F("°C "));
|
|
Serial.print(hif);
|
|
Serial.println(F("°F"));
|
|
}
|