#09intermediate
Motion Guardian
PIR-based motion detection alarm system
Watch the circuit build itself: components drop in, wires connect, and the output comes alive.
Components
Everything you need for this project.
1x HC-SR501 PIR sensor
1x Active buzzer
1x Red LED
1x 220Ω resistor
4x jumper wires
How It Works
PIR sensor operation (passive infrared), digital input from a sensor module, timing and timeout logic, and alarm system design.
InputPIR Motion Sensor
ProcessingESP32-S3 reads digital HIGH on motion detection
OutputAlarm: LED + buzzer
What You Build
PIR sensor on D1, red LED on D2, buzzer on D3. Motion triggers a timed alarm sequence.
African Context
Simple motion alarms protect homes, shops, and farm stores. This circuit is the basis of security systems used across urban and rural Africa.
What You'll See
Walking past the sensor triggers the LED and buzzer for a set duration. Display shows detection events and countdown timer.