Build a Simple Robotic Metal Detector (part four)

Here is the code for the arduino that allows it to receive input from the metal detecting circuit.

//Begin Arduino code


// Programmer: Gunther Cox
// http://salviusrobot.blogspot.com
// Created: 02/15/12
// Hardware setup instructions:
// Plug relay shield directly into arduino so that all pins line up.
// Attach 9 volt power supply to GND and +9V plugs of relay shield.

//  connect whatever you want to indicate metal is detected with (ex: an LED) to pin 4
int outPin1 = 4;
int detectorPin = 3;  // connect positive wire from circuit here
int detectorState = LOW; // we start, assuming no metal has been detected
int val;            // variable for reading the pin status

void setup() {
  pinMode(detectorPin, INPUT);        // declare sensor as input
  pinMode(outPin1, OUTPUT);    // declare relay as output
  digitalWrite(outPin1, LOW);
  digitalWrite(detectorPin, LOW);
}

void loop() {
  val = digitalRead(detectorPin);  // read input value and store it in val
  if(digitalRead(detectorPin) == HIGH) {
    // turn output pin on for one second
    digitalWrite(outPin1, HIGH);  // sets relay1 on
    delay(1000);                    // waits for 1 second
    digitalWrite(outPin1, LOW);   // sets relay1 off
  }
}



//End Arduino code