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Iot-Project.ino

+//Internet of Things Project Code
+//This code will be used to connect the ESP8266 microcontroller to the internet
+//and then gather the humidity and temperature data from the DHT11 sensor
+//and display it on the cloud service ThingSpeak
+
+//Libraries 
+#include <ESP8266WiFi.h>
+#include <DHT.h>
+
+//Network access SSID and password
+WiFiClient client;
+const char *ssid = "BTHub6-FHZM";
+const char *password = "exQ4EDgfVT7R";
+
+//ThingSpeak API key and server address
+const char* server ="api.thingspeak.com";
+String thinkspeakAPIKey = "QC30MAFXUWR6V8IH";
+
+//Define what pin the DHT11 is connected on the microcontroller
+#define DHTPIN 3
+DHT dht11(DHTPIN, DHT11);
+
+void setup() {
+  // put your setup code here, to run once:
+  //Connecting the ESP8266 to the internet
+  Serial.begin(115200);
+  dht11.begin();
+
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(1000);
+  }
+  Serial.println("WiFi connected");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  // Read humidity and temperature
+  float temp = dht11.readTemperature();
+  float humidity = dht11.readHumidity();
+
+  if (client.connect(server, 80)) {
+    //Posts humidity and temperature to fields 1 and 2 on thingspeak
+    String postData = thinkspeakAPIKey;
+    postData +="&field1=";
+    postData += String(temp);
+    postData +="&field2=";
+    postData += String(humidity);
+    postData += "\r\n\r\n";
+
+    //Connect to thingspeak and send data via the API key
+    client.print("POST /update HTTP/1.1\n");
+    client.print("Host: api.thingspeak.com\n");
+    client.print("Connection: close\n");
+    client.print("X-THINGSPEAKAPIKEY: "+thinkspeakAPIKey+"\n");
+    client.print("Content-Type: application/x-www-form-urlencoded\n");
+    client.print("Content-Length: ");
+    client.print(postData.length());
+    client.print("\n\n");
+    client.print(postData);
+
+    // Prints temperature and humitity to the serial monitor.
+    Serial.print("Temperature: ");
+    Serial.print(temp);
+    Serial.print("Humidity: ");
+    Serial.print(humidity);
+  }
+  client.stop();
+  // Thingspeak needs 15 seconds to update so I have set a delay for 30 seconds. 
+  delay(10000);
+}