Reed Switch With Arduino
Reed switch is used in many of the real-life applications such as magnetic door switch, laptops, smartphones etc. In this instructables, we will learn about Reed Switch and guide you, how to Interface a Reed Switch with Arduino.
Things You Need
For this instructables we will need following things :
Arduino Uno
Reed switch
Resistors
LED
Magnet
Connecting wires
Breadboard
Schmatics
To interface reed switch with Arduino we need to build a voltage divider circuit as shown in the figure below. Voltage is +5V when the switch is open and 0V when the switch is closed. We are using a normally open reed switch in this project. Switch is closed in the presence of magnetic field and it is open in the absence of magnetic field.
Code
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Please copy the following code and upload it to the arduino Board :
int LED = 7;
int reed_switch = 4;
int reed_status;
void setup()
{
pinMode(LED, OUTPUT);
pinMode(reed_switch, INPUT);
}
void loop()
{
reed_status = digitalRead(reed_switch);
if (reed_status == 1)
digitalWrite(LED, LOW);
else
digitalWrite(LED, HIGH);
delay(1000);
}
Reed Switch in Action
After connecting everything together and uploading the code to your arduino so whenever i put a magnet near to the reed switch it gets triggered and LED turns ON.