Hi,
i want to connect multiple powersources (lipo) and multiple servos (mg996R) to a single PCA9685.
I have read article: https://forum.arduino.cc/t/how-to-connect-multiple-power-supplies-to-multiple-pca9685/934953 but i don not understand the solution completely.
My idea would be that only the PWM wires are attached to the PCA9685 and for each two MG996R the powerwires connect (via safety measures for the lipo) to the lipo's. The lipo's are not interconnected.
Will this go wrong or is this a sound solution?
Kind regards,
Bart
The solution proposed in the topic that you linked to was to connect the Lipos in parallel
Your suggestion is slightly different but sounds as though it could work. However, the GND wire of each Lipo will need to be connected to the GND pins of the PCA9685 in order to provide a single reference point for the servo signals
So all my GND pins from the complete project should be connected? All the GND pins from all Lipos, the Arduino, all MG996R, all sensors etc? I think that to be true, but would like it confirmed by experts 
Thank you in advance!