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guys the Arduino code you used for the magnetic sensor was left on the laptop in the Phys Comp area. in case you did not save it, i am posting it here -marc

// declare variables: int switchPin = 2; // digital input pin for a switch int yellowLedPin = 3; // digital output pin for an LED //int redLedPin = 4; // digital output pin for an LED int switchState = 0; // the state of the switch

void setup() {

  pinMode(switchPin, INPUT);       // set the switch pin to be an input
  pinMode(yellowLedPin, OUTPUT);   // set the yellow LED pin to be an output
 // pinMode(redLedPin, OUTPUT);      // set the red LED pin to be an output

}

void loop() {

  // read the switch input:
  switchState = digitalRead(switchPin);

  if (switchState == 1) {
    // if the switch is closed:
    digitalWrite(yellowLedPin, HIGH);    // turn on the yellow LED
    //digitalWrite(redLedPin, LOW);       // turn off the red LED
  } 
  else {
    // if the switch is open:
    digitalWrite(yellowLedPin, LOW);   // turn off the yellow LED
    //digitalWrite(redLedPin, HIGH);     // turn on the red LED
  }

}