Lesson: 16 – How to Use Reed Switch with Arduino | DIY Door Security Alarm System

Lesson: 16 – How to Use Reed Switch with Arduino | DIY Door Security Alarm System

Hello and Welcome to Electro Nerds Academy, In this video we will learn how to use a Reed Switch with an Arduino, we’ll explain how reed switches work, how to connect them to an Arduino, and how to build a DIY simple door security alarm system using just a reed switch, a push button, and a buzzer.

What you’ll learn in this video:

✅ What is a reed switch
✅ Inner construction of the reed switch and how it works
✅ How to wire a reed switch with Arduino
✅ How to build a DIY Arduino security system for your room or project

👉 Whether you’re a hobbyist, student, or DIY maker, this Arduino project is simple, fun, and highly useful!

Code used in this video:

int buttonState = 0;
int sensorState = 0;
String mode = “de-active”;

void setup() {
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
pinMode(4, OUTPUT);
digitalWrite(4, HIGH); // Ensure the buzzer is off initially
}

void loop()
{
buttonState = digitalRead(2);
sensorState = digitalRead(3);

if (buttonState == LOW && mode == “de-active”) {
while (digitalRead(2) == LOW) {
// Wait for the button to be released
}
mode = “active”;
}

if (sensorState == HIGH && mode == “active”) {
digitalWrite(4, HIGH); // Buzzer off
} else if (sensorState == LOW && mode == “active”) {
digitalWrite(4, LOW); // Buzzer on
}

if (buttonState == LOW && mode == “active”) {
while (digitalRead(2) == LOW) {
// Wait for the button to be released
}
mode = “de-active”;
}
}

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