DTH je čislo teploty a vlhkosti.
Já ho mám jako variantu AM2302 (napájenou na destičce s odporem…)
INSTALACE KNIHOVNY DTH
1) DHT sensor library
2) Adafruit Unifield Sensor
Sériový monitor je potřeba manstavit na 9600kbps
/**
* Example for reading temperature and humidity
* using the DHT22 and ESP8266
*
* Copyright (c) 2016 Losant IoT. All rights reserved.
* https://www.losant.com
*/
#include "DHT.h"
#define DHTPIN 4 // what digital pin the DHT22 is conected to
#define DHTTYPE DHT22 // there are multiple kinds of DHT sensors
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.setTimeout(2000);
// Wait for serial to initialize.
while(!Serial) { }
Serial.println("Device Started");
Serial.println("-------------------------------------");
Serial.println("Running DHT!");
Serial.println("-------------------------------------");
}
int timeSinceLastRead = 0;
void loop() {
// Report every 2 seconds.
if(timeSinceLastRead > 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("Failed to read from DHT sensor!");
timeSinceLastRead = 0;
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("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *F\t");
Serial.print("Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.println(" *F");
timeSinceLastRead = 0;
}
delay(100);
timeSinceLastRead += 100;
}
Zdroj: https://www.losant.com/blog/getting-started-with-the-esp8266-and-dht22-sensor