Development of a braking system for a longboard

Job ID: 32052528

Budget: €30 – €250 EUR

Development of a braking system for a longboard
I need a braking system for a longboard. When there is no more weight on the board, a sensor detects this, and the sensor sends a signal to the braking system. In the end, the 2 wheels should block and the whole board should stop.
I imagine the braking system as follows:
A cylindrical pin made of steel is fixed to the longboard wheel. It rotates with it while driving.
If the rider falls down or if there is no more weight on the board, a sensor sends the signal to the braking system. The hook blocks the cylindrical pin. So the board stops.