Driving an ICF-340-30-2 fan motor with an STM8 

My ex-neighbour came to me with an idea which was built around a HVAC fan motor and it's driver. It was salvaged from an old Toshiba air conditioner. You can find a pretty comprehensive service manual for it here. The motor is a ICF-340-30-2 and the driving board is a MCC-821-03 board.

Of course in it's state it was not able to drive the motor as we wanted so I have cut out the original MCU and replaced with an 1 USD STM8S003F3 board:

The motor driving is simple: there is a drive and a feedback signal. Both are optically isolated by the IC10 and IC11 optocouplers.

Here is the relevant pins of the main MCU (IC30):
- 21: Drive signal
- 22: Feedback signal
- 17: front button
(VCC (+5V) and GND is accessible from a plenty place)

I have successfully managed to get the motor running by generating an 1.6KHz PWM signal to the drive signal. I have not cared about the feedback signal (closed loop is for the puppies :D)
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