Micro:Bit Alarm System

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

Supplies

Micro:Bit controller

Breakout board for Micro:Bit

1602 LCD screen

Ultrasonic range finder

Step 1:

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

Step 2:

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

Step 3:

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

Step 4:

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