Ok, servo board works perfectly for my quadbot. However, I kill 3 servos(HS-485HB) in a day!!!
This servo board support 14 servos and I have connect them with external power - 7.4v lipo 2800mAh. The battery connected like this(the battery is 7.4 not 11.1v any more):
Here is what happening; When I do the coding I have USB connected and power off from battery. After coding I turn on the switch so servos has enough power to do the moves and USB still connected. It was fine for several attempts but after 5~6 times repeating the same procedure then I got my first servo not working, I replace it and I switched off the battery and did uploading and switch on, then I got 2nd servos burned right the way! No sparks or smoke but bad smells. Same procedure and 3rd servo burned. I have no idea why the servo burned so easily. Anyone have any ideas? I am assuming I probably can't have USB and battery on at same time, especially when the moment I repeating turn on the switch and have high current flows in that impact the servos??
Again, I have to say sorry for my bad English and writing skill. If this is not clearly explain what happened please let me know and I will try my best to explain again.
Thanks in advance for anyone could help me with this issue~~
P.S. Servo shield I am using now: