Micro:Bit Alarm System

This ultrasonic ranger based alarm system is triggered by objects within 1m of the sensor.

Micro:Bit controller

Breakout board for Micro:Bit

1602 LCD screen

Ultrasonic range finder

Connect to USB power into the breakout board. It will immediately start sounding, but don't mind that.

Press the logo on the microcontroller (it's capacitive - a tap will do) to set the alarm.

Try interrupting the path in front of the sensor within 1m! Sound will go off and the LCD will say "Intruder!!"

Press the logo on the microcontroller to turn off the alarm and reset to "All clear"