PROJECT 21: MOTION SENSOR ALARM
IN THIS PROJECT, WE’LL BUILD A MOTION-SENSING ALARM USING A PASSIVE INFRARED (PIR) SENSOR.
PARTS REQUIRED
• Arduino board
• Breadboard
• HC SR501 PIR sensor
• LED
• Piezo buzzer
You can use this alarm to trigger a variety of outputs, such as lights, motors, or even a “welcome home” message when you approach your front door.
HOW IT WORKS
This project is based on the HC SR501 PIR sensor, which is widely available online for a few dollars. We’re going to set it up so that when someone passes in front of the PIR sensor, ...
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