IN THIS PROJECT, WE’LL BUILD A MOTION-SENSING ALARM USING A PASSIVE INFRARED (PIR) SENSOR.
• Arduino board
• HC SR501 PIR sensor
• 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.
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, ...