added all the required files for MQ2 Gas Sensor

Author: das1396

Diff for: MQ2 Combustible Gas Sensor with Arduino/README.md

@@ -0,0 +1,28 @@
+// Sensor pins pin D6 LED output, pin A0 analog Input
+#define ledPin 6
+#define sensorPin A0
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(ledPin, OUTPUT);
+  digitalWrite(ledPin, LOW);
+}
+
+void loop() {
+  Serial.print("Analog output: ");
+  Serial.println(readSensor());
+  delay(500);
+}
+
+//  This function returns the analog data to calling function
+int readSensor() {
+  unsigned int sensorValue = analogRead(sensorPin);  // Read the analog value from sensor
+  unsigned int outputValue = map(sensorValue, 0, 1023, 0, 255); // map the 10-bit data to 8-bit data
+
+  if (outputValue > 65)
+    analogWrite(ledPin, outputValue); // generate PWM signal
+
+  else
+    digitalWrite(ledPin, LOW);
+  return outputValue;             // Return analog moisture value
+}