Write ESP DHT22 demo

.gitmodules

@@ -4,3 +4,7 @@
 [submodule "dht22/lib/SimpleDHT"]
 	path = dht22/lib/SimpleDHT
 	url = https://github.com/winlinvip/SimpleDHT
+[submodule "dht22-esp8266/lib/esp8266-dht22"]
+	path = dht22-esp8266/lib/esp8266-dht22
+	url = https://github.com/Defozo/esp8266-dht22.git
+	branch = patch-1

dht22-esp8266/dht22-esp8266.ino

@@ -0,0 +1,33 @@
+#include "lib/esp8266-dht22/dht22.h"
+#include "lib/esp8266-dht22/dht22.c"
+
+#define DHT_TYPE		DHT22
+// D1
+#define DHT_PIN_DATA	5
+
+void setup() {
+	Serial.begin(115200);
+	Serial.println("DHT22 Demo");
+	Serial.println("==========");
+	Serial.println("Board: ESP8266");
+	
+	Serial.print("Initialising the DHT - ");
+	DHT_init(DHT_PIN_DATA, DHT_TYPE, 1);
+	DHT_begin();
+	
+    Serial.println("done"); 
+	Serial.print("Waiting to warm DHT22 up - ");
+	delay(2000); // Give the DHT22 time to warm up
+}
+
+void loop() {
+	float temp, humidity;
+	
+	temp = readTemperature(false);
+	humidity = readHumidity();
+	
+	Serial.print("Temperature: "); Serial.print(temp); Serial.println("°C");
+	Serial.print("Humidity: "); Serial.print(humidity); Serial.println("%");
+	
+	delay(1000);
+}

dht22-esp8266/lib/esp8266-dht22

@@ -0,0 +1 @@
+Subproject commit b949ac35a553e4089f3e81dc7e4d739a02a00f78

dht22/dht22.ino

@@ -39,4 +39,3 @@ void loop() {
 
     delay(2000); // We can only read every 2 seconds
 }
-

dht22/lib/SimpleDHT

@@ -1 +1 @@
-Subproject commit 80ac2b47c9caca07edf75f38289cfd64023872c9
+Subproject commit 155f77445daa0b4757f79d984865ba68a59a7cf8