> For the complete documentation index, see [llms.txt](https://longer-vision-robot.gitbook.io/arduino-full-stack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://longer-vision-robot.gitbook.io/arduino-full-stack/06_magnetic_sensors/022_reed.md).

# 6.4 Reed

## Hardware Wiring

![Reed](/files/-LCFECeMmimzKNfOvo0t)

## Sketch

The code can be found at [Examples\_Arduino - sensor-kit-for-arduino - \_022\_Reed - \_022\_Reed.ino](https://github.com/LongerVisionRobot/Examples_Arduino/blob/master/sensor-kit-for-arduino/_022_Reed/_022_Reed.ino).

```
int Led=13;      // Define LDE Pin
int buttonpin=3; // Define reed sensor's pin
int val;         // Define Variable val
void setup()
{
  pinMode(Led,OUTPUT);  // Define LED as output
  pinMode(buttonpin,INPUT); // Define reed sensor's pin as output
}
void loop()
{
  val=digitalRead(buttonpin); // assign digital pin 3's reading to val
  if(val==HIGH)  // anything detected by linear hall sensor, LED starts
  {
    digitalWrite(Led,HIGH);
  }
  else
  {
    digitalWrite(Led,LOW);
  }
}
```