Create IRSensor

Author: bocin58

arduino/IRSensor

@@ -0,0 +1,43 @@
+#define irLedPin 4          // IR Led on this pin
+#define irSensorPin 5       // IR sensor on this pin
+
+
+void setup()
+{
+  pinMode(irSensorPin, INPUT);
+  pinMode(irLedPin, OUTPUT);
+  Serial.begin(9600); 
+  // prints title with ending line break 
+  Serial.println("Program Starting"); 
+  // wait for the long string to be sent 
+  delay(100); 
+}
+
+void loop()
+{  
+  Serial.println(irRead(irSensorPin, irLedPin)); //display the results
+  delay(1); //wait for the string to be sent
+}
+
+/******************************************************************************
+ * This function returns a zero if something is detected by the sensor, and a 1 otherwise
+ * The function bit bangs a 38.5khZ waveform to an IR led connected to the
+ * triggerPin for 1 millisecond, and then reads the IR sensor pin to see if
+ * the reflected IR has been detected
+ * also sends back the analog data read by the sensor
+ ******************************************************************************/
+int irRead(int readPin, int triggerPin)
+{
+  int halfPeriod = 13; //one period at 38.5khZ is aproximately 26 microseconds
+  int cycles = 38; //26 microseconds * 38 is more or less 1 millisecond
+  int i;
+  for (i=0; i <=cycles; i++)
+  {
+    digitalWrite(triggerPin, HIGH); 
+    delayMicroseconds(halfPeriod);
+    digitalWrite(triggerPin, LOW); 
+    delayMicroseconds(halfPeriod - 1);     // - 1 to make up for digitaWrite overhead    
+  }
+  return digitalRead(readPin);
+  return analogRead(readPin);
+}