We made a diy motion alarm for security at the door.

Step 1: Motion Detecting Alarm

What is it?

It is an motion detecting alarm made using arduino uno, PIR (motion) sensor and a buzzer

Why is it used?

Itis used to provide security in a shop or home, at the door.

Step 2: How to Make It

input- PIR sensor

processor- arduino uno

output- buzzer

requirements-

jumper wires (as required)

PIR sensor- 1

arduino uno- 1

breadboard- 1

power supply- 9V battery

buzzer- 1

steps-

1. connect I/O pin 2 to the breadboard.
2. connect 5V and Gnd to the breadboard.
3. find Gnd, Vcc and Out pins on the PIR sensor.
4. connect (-) pin to the Gnd on breadboard, (+) pin to the 5V and the Out pin to the digital pin 2.
5. connect anode of the led to digital pin 13 and cathode to the Gnd.
6. connect the red wire of the buzzer to digital pin 10 and the black wire to the Gnd.

void setup(){

pinMode(2, INPUT);

pinMode(10, OUTPUT);

pinMode(13, OUTPUT);

}

void loop(){

if(digitalRead(2)==HIGH)

{

digitalWrite(13, HIGH);

digitalWrite(10, HIGH);

delay(100);

digitalWrite(13, LOW);

digitalWrite(10, LOW);

delay(100);

}