Well apart from the power supply you used which hasn't been answered, so far it looks like you have done everything right so no worries there. All I can suggest is try all of the remaining servos you have, and if none of them work then send them back for a refund if the option is available. As unlikely as it seems, it is possible and you could be right that you may have a bad bunch.

Quote:

OK well so far I have been able to reduce the voltage going to the servo down to 6Vdc. Now the EZ-B does not reset constantly.

You mention this in post #8. Can I ask, what voltage was you using before you dropped it to 6v?

As well as the heavy duty available from EZ-Robot which from my experience are very reliable, I have supplied two links to similar torque 6v servos to what you have which will do the job with the EZ-B.

www.amazon.com/gp/aw/d/B00RCATIAE/ref=mp_s_a_1_1?qid=1422478012&sr=8-1

www.amazon.com/gp/aw/s/ref=is_box_toys-and-games?k=Foxnovo+4pcs+TowerPro+MG945+12KG+High+Torque+Metal+Gear+Servos+for+RC+Boat+%2FCar+%2FHelicopter

David, one thing I forgot to ask in my post above, can you post a photo of the the set up you have, with the servo connected to the EZ-B and connected power supplies? It might help to have a look just to confirm the connection are correct.

@Steve G that's a really good idea... Perhaps a video of what David is doing might be even better...

I was able to take the servos to a hobby shop. They checked out OK when connected to an RC car.

Power supply was at 8.2V before I dropped it to 6V. I have removed the wall adapter I was using and am now running the system solely on a 7.4V Lipo.

Right now I am using a 7.4V 2800 mAh Lipo battery connected to the EZ-B. FT009

Voltage at PWR pin of D0 [middle red] : 7.9V

Voltage at voltage divider going to servo : 5.88V

I would prefer to not buy new servos for this project if at all possible.

Still no movement.

Dave

Save your project file you have been using for testing to this thread. I want to see the servo settings directly. I think we are missing something simple.

Alan

Here is my basic servo.EZB

Hope this helps.

Davebasicservo.EZB

Well after looking at you servo project, apart from an ARC version update that is needed, there's nothing immediately evident that is wrong as it is such a basic file.

I am almost out of ideas myself and there's only a couple more things I can add to what I have already suggested so far.

1. Maybe, just maybe you have managed to find a servo that is not compatable with the EZ-B/builder, although I do find this highly unlikely, I wouldn't count it out at this stage.

2. Maybe it could be something to do with the power devider you have in place. There is one thing you can try now you're using a 7.4v LiPo battery, leave the devider out of the equation and plug one of the servos directly in to the board. Yes there is a bit of a voltage variation, but I refer you to this thread from post #23 onwards explaining that this should be ok to do. If you are willing to try this then open up a scrip control and copy/paste the following script. This script asumed the servo is connected to port D0.

Servo(D0,90)
Slee(500)
Servo(D0,1)
Sleep(1000)
Servo(D0,180)
Servospeed(D0,1)
Sleep(1000)
Servo(D0,1)
Servospeed(D0,2)
Sleep(2000)
Servo(D0,180)
Servospeed(D0,3)
Sleep(3000)
Servo(D0,1)
Servospeed(D0,4)
Sleep(4000)
Servo(D0,180)
Servospeed(D0,5)
Sleep(5000)
Servo(D0,1)
Servospeed(D0,6)
Sleep(6000)
Servo(D0,180)
Servospeed(D0,7)
Sleep(7000)
Servo(D0,1)
Servospeed(D0,8)
Sleep(8000)
Servo(D0,180)
Servospeed(D0,9)
Sleep(9000)
Servo(D0,1)
Servospeed(D0,10)
Sleep(10000)

This will run through every servo speed option with the relevant pauses in between. It would be intresting to run this just to see if the servo moves of tries to move at any of these speeds.

So, apart from seeing I picture or, as Richard mentioned, a quick video of your set up, I'm not really able to help you much further as this is all I have to offer for now, as I am out of ideas too. Good luck.

I don't know a lot about voltage dividers but although yours is producing a voltage of 5.88 or so (which is good), are sure your servos are getting enough power (amps) through it?