Made a small production run of shark coasters for some coworkers. It fires the laser when you tap it when sitting, changes colour depending on the temperature and goes into full rainbow mode when you pick it up!
Achieved with a stack of 3 PCBs soldered together, which also serves to connect the NTC from the back of the top most PCB. STM32L051 powering it with an IS32FL3733 LED driver and LIS2DH accelerometer, powered through a micro USB port
Fred Temperton 