As promized, I am just starting to port my HDD clock on a new MCU : ESP32

This would have several adavantages:

• wifi and bluetooth are enabled. No need to connect to a PC via USB
• ESP32 lolin lite breadboard has everything needed: power supply, battery, USB to serial programmer
• no need for the RTC chip as wifi connection is available to get time over NTP
• easy to hook up an android App to this MCU 

Here are the simplified schematics

It's indeed much simpler than the PIC circuitery !

• one mosfet is still needed to drive the coil  
• one L6234 to drive the BLDC motor.
• one RPR220 as a position sensor.