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Example sketch

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ladyada committed Jun 22, 2011
1 parent 57ac62d commit 53f985c6b43ed56c177ec0a632a06d793d21a41c
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  1. +43 −0 examples/DHTtester/DHTtester.pde
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+// Example testing sketch for various DHT humidity/temperature sensors
+// Written by ladyada, public domain
+
+#include "DHT.h"
+
+#define DHTPIN 2 // what pin we're connected to
+
+// Uncomment whatever type you're using!
+//#define DHTTYPE DHT11 // DHT 11 works
+#define DHTTYPE DHT22 // DHT 22 (AM2302)
+//#define DHTTYPE DHT21 // DHT 21 (AM2301)
+
+// Connect pin 1 (on the left) of the sensor to +5V
+// Connect pin 2 of the sensor to whatever your DHTPIN is
+// Connect pin 4 (on the right) of the sensor to GROUND
+
+DHT dht(DHTPIN, DHTTYPE);
+
+void setup() {
+ Serial.begin(9600);
+ Serial.println("DHTxx test!");
+
+ dht.begin();
+}
+
+void loop() {
+ // 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();
+ float t = dht.readTemperature();
+
+ // check if returns are valid, if they are NaN (not a number) then something went wrong!
+ if (isnan(t) || isnan(h)) {
+ Serial.println("Failed to read from DHT");
+ } else {
+ Serial.print("Humidity: ");
+ Serial.print(h);
+ Serial.print(" %\t");
+ Serial.print("Temperature: ");
+ Serial.print(t);
+ Serial.println(" *C");
+ }
+}

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