Ractive at 14:57, 7 October 2018

2018-10-07T14:57:09Z

← Older revision		Revision as of 14:57, 7 October 2018
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	[[File:DHT22-Sensor-Pinout.png]]		[[File:DHT22-Sensor-Pinout.png]]
	[[File:DHT22-DHT11-Circuit-Schematics.png]]		[[File:DHT22-DHT11-Circuit-Schematics.png]]

			// Example testing sketch for various DHT humidity/temperature sensors
			// Written by ladyada, public domain
			#include <Adafruit_Sensor.h>
			#include "DHT.h"
			#define DHTPIN 8 // 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("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("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("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");
			}

Ractive at 14:31, 7 October 2018

2018-10-07T14:31:09Z

← Older revision		Revision as of 14:31, 7 October 2018
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	[[File:DHT22-Sensor-Pinout.png]]		[[File:DHT22-Sensor-Pinout.png]]
			[[File:DHT22-DHT11-Circuit-Schematics.png]]

Ractive: Created page with "File:DHT22-Sensor-Pinout.png"

2018-10-07T14:24:22Z

Created page with "File:DHT22-Sensor-Pinout.png"

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[[File:DHT22-Sensor-Pinout.png]]

DHT22 - Revision history

Ractive at 14:57, 7 October 2018

Ractive at 14:31, 7 October 2018

Ractive: Created page with "File:DHT22-Sensor-Pinout.png"