Servo's won't move

Hey,
I have an SSC-32 and I’ve built a 2DOF hexapod. I plugged the 12 servos into the board, and applied the power to the logic and to the VS1. I made sure the VS1=VS2 jumpers were in place, removed the VS1=VL jumper, and checked the positions of all other jumpers and the servo plugs. The first time i used this set up, i had a slightly mixed up set of batteries, with a 6vdc battery pack running half the legs, and a 9v the other, with a 9v handling the logic as well. The one side was a little jittery, although the whole system was working ok-ish. However, when i removed this battery and replaced the jumper (which at the time was off due to me having two separate power sources) none of the legs would move, unless i was using the sequencer’s offset slider, in which case that particular servo would move. I figured that it was probably an issue in power, so i spliced together a pair of 3.6v ac adapters in series to form a 7.2 vdc wall connection, and plugged that into the VS1, with the proper polarity and the proper jumpers in place. Now, none of the servos seem to be running. I have the sequencer running, it recognizes the ssc, the green light flashes when i give it commands, the servos don’t seem to have been damaged, since they were working effectively when i last took the power out, albeit in singularity. So anyone have an idea as to what could be wrong? I will post pictures tomorrow if that will help.

Thanks

The servo’s don’t even twitch when first powered on? That’s pretty odd…

There must be some jumper connection error. It would probably be much easier to figure this out once you post the pictures.

Sounds to me that you might not be getting enough current to move all 12 servos. You need about 2 amps to move 12 servos. Did you try disconnecting all but one servo to see if it will kinda sorta move? if it does then the amount of current from your batt. or wall adapter may be the issue. You need amps not just volts.

EDIT I meant to say 2 amps not one. My wall adaptor is 6v 2 amps and it’s able to power my 13 servo brat, however, the brat only has two legs and not 6.

Your post contradicts itself in two places. First if you have VS1=VS2 enabled it’s impossible to have 6vdc on one side and 9vdc on the other side. Second you mention attaching two 3.6vac adapters for 7.2vdc. Hows that work? :stuck_out_tongue:

The current required for a 12 servo hexapod should be around 3-5 amps depending on how the vertical movement is designed. Agreed a picture would be helpful. Good wall adapters are generally 12 watts. So 6vdc at 2 amps is a good example. That will work for an arm, 4 to 6 servos, but I have concerns with it powering a 12 servo hexapod.

You need more power…

Hey, I tried again this morning, plugging my power supply back in, and everything worked, albeit very jittery. I then switched to my 4-AA battery pack and it all worked fine. I’m not really sure why, but everything is working well now. Thanks for the help though, I’m sure I’ll be back soon with more questions :slight_smile:

your 4-AA battery pack has more ability to deliver short but high current bursts of energy than any wall-wart power supply ever will. :wink: