Introduction: Micro:bit Combination Lock
You'll need
1 x BBC micro:bit
1 x Buzzer
4 x Crocodile clips
1 x Copper tape (or kitchen foil)
1 x Sticky back velcro (or double sided tape)
Step 1: The Alarm Circuit
How it works
The BBC micro:bit can test if a circuit is complete. We can use this to activate different bits of code.
We are going to separate the circuit into two pieces, two strips that connect to the micro:bit and one strip which connects them together when it touches.
Step 2: Make the Circuit Breaker
Get the box
Because this circuit is so simple, you can use it on anything that closes! A door, a window, a fridge, a drawer, a jar, a box!
We're using a big box to make it easy to show how it all works, but get creative with your alarm system.
Open the box and attach a strip of copper tape on the inside, front lip of the lid.
Step 3: Attach the Micro:bit
Close the box slightly and mark 2 points where the strip touched the front.
Attach two vertical strips of copper tape here with a fold at the end You can use Velcro, glue pads or even blue tack!
Step 4: Connect to the Micro:bit
Using crocodile clips, or stripped wires, connect one side to P0 and the other to GND
Step 5: Attach the Buzzer
Stick it to the box and connect the red wire to P1 and the black to GND
Step 6: Code
https://makecode.microbit.org/#pub:_a09fKzctM1Rv
Step 7: Try It Out!
