Hi!
I built a sweet little servo control and power pack as seen on picture. I am using arduino mega for controlling some servos. I have 2x 6V external battery packs for power support on the side. My question is:
Do i have to connect both of the black (ground) wires of the battery packs to the arduino or is it enough if i connect only one black cable from just one battery pack? (The arduino is powered by the usb cable.)
And what will happen if i don't connect the arduino's ground to the battery pack's ground?
jecky111:
Do i have to connect both of the black (ground) wires of the battery packs to the arduino or is it enough if i connect only one black cable from just one battery pack?
Why would you not want to?
jecky111:
what will happen if i don't connect the arduino's ground to the battery pack's ground?
Give that a shot.
okay, thank you, i will try. hopefully it doesn't blow up. for me electrocetchnics is kinda like magic lol
jecky111:
okay, thank you, i will try. hopefully it doesn't blow up. for me electrocetchnics is kinda like magic lol
How about answering my question.
Why are you trying to get out of connecting both battery Negs/Gnds together and to the Arduino Gnd?
And what will happen if i don't connect the arduino's ground to the battery pack's ground?
Once you have tried it, read this page:-
http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html
Grumpy_Mike:
And what will happen if i don't connect the arduino's ground to the battery pack's ground?
Once you have tried it, read this page:-
http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html
sweet, thats the info i was looking for. thanks!
Simple answer: coz i dont know what am i doing 
but thx for the help, i actually got all my 7 servos to work at once