Arduino Sensors: Magnetic Reed Switches

today we'll take a look at using magnetic Reed switches with your Arduino.
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ARDUINO Code:
#define led 13
#define reed 3
boolean trig ;
void setup() {
pinMode(led, OUTPUT);
pinMode(reed, INPUT);
}
void loop() {
if (digitalRead(reed) == true)
{
digitalWrite(led, LOW);
}
else
{
digitalWrite(led, HIGH);
}
}