In reply to https://hackaday.io/project/181677/discussion-169393

I  had  another  look at the mcu that I removed from my 2nd version of the car reversing kit and saw it had  chip markings on the underside. (N.B 2 pictures shown as for some reason the light obscures one or other dependent on angle )The markings say:

   FH511
   LON.1

However I couldn't find anything useful by googling that!

Here also are some closeups of the two footprints on the 2 different car reversing kit boards I have.

mcu footprint of first kit1 I bought

mcu footprint of second kit I bought

Here is why I think it might be a PIC12

The original MCU pinout ( based on the 8 pin footprint, but for both boards) v PIC12 footprint. I have only quickly studied the PIC12 datasheet and the pcb so data may be inaccurate!