Now I have collected all the 4 boards associated with GPi 8p8i on a bigger board. Now it is easy to do maintenance by removing one mother board with 4 daughter boards.
One careless mistake I made was forgetting the common wired between the RPi/GPi signal ground and servo signal ground. This causes the robot arm and robot head move randomly but very quickly like crazy. This might be very dangerous when I later play with heavy duty big power motored robot arms. I need to think of a way to cut the servo power off with it is not in common with the main logic system.
.END
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