I am glad you like it. Now I have merged the two proto boards together in an all-in-one board, and then used CuteCom to readVin some twenty times, to see how accurate or reliable are the measurements.

Next step is to write a python program to repeatedly read Vin, and at the same time use a scope to display the request string from Rpi, and the reply string from servo. What I am curious to know is the response time between servo receiving request string, to servo sending the data (Vin) string. The LeWanSoul user guide says your need to be quick, but does not say how quick you should be.