this is simple motion detector with ultrasonic sensor. It detects the person and trigger the relay which leads to light for 30 seconds for each trigger.
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Step 1: the Components
for THE WATCHER
2. 5v relay
3. ultrasonic sensor
4. usb wire
5. plastic box
6. 5v power supply
these components are required for the THE WATCHER
Step 2: The Coding
In this project coding is very easy. You can download the code for the link below and you have to change the distance as your room. keep distance 5 less than the length of the room.
here is the link for my video >>>> https://youtu.be/iMs63-4nVs8 <<<<
Step 3: Connections
the ultrasonic sensor connected as
trig pin -> pin 8
echo pin -> pin 7
vcc- > 5v pin
gdd -> gdd
the relay connections
signal pin (INT) -> pin 3
gdd to gdd
power supply to arduino by the usb cable and mobile charger 5v 1amp
*the simulation software ultrasonic sensor has only 3 pin but i have used hc-sr04 which has 4 pin so connect the ultrasonic sensor as i describe above to arduino pin.