Micro:bit Mine Clearance Alarm

Hello, let’s try the compass on the micro:bit today! A digital compass is an input sensor that detects magnetic fields. Your BBC micro:bit has an inbuilt compass that can detect the direction in which it is facing. I am going to make a mine clearance alarm project today.

Firstly let’s have a look at where the compass stays on the micro:bit:

Shot the Bul eye

Actually, the compass could be regarded as a module to measure the magnetic field strength in various directions. The magnetic field strength can be understood as the attractive force of the magnets we usually play with. And of course, it could tell us the directions. Now let’s try our gameplay today.

Shot the Bul eye

Detect if there is any magnetic hidden somewhere, if yes, program to display a sad face or display a happy face.

Materials required:

Shot the Bul eye

Firstly, judge the magnitude of the magnetic field, if it is bigger than a certain value, execute the program in the module. Here I set the value to 400. You could change this value to adapt the sensitivity of the measurement.

Shot the Bul eye