RoboPi with Parralax 360 Servo question

I have the RoboPi board from Mr. Henning, and a Raspberry Pi 3, and I am going to power the RPi3 from a rechargeable micro USB power pack. The RoboPi (as far as I can tell) gets its power from the RPi, which would be 5V.
The new Parallax 360 servos look like they need 6 - 8V to run well from the specs. So is the best way to do this maybe purchasing a 5 AA battery holder from Parallax and then power the servos from that and not draw from the RPi/RoboPI power source?
Thanks for any tips.
My goal is to hook the lidar up to the RPi and have the Propeller chip on the RoboPi do the servo motors and other sensors.

Comments

  • 6 Comments sorted by Date Added Votes
  • I would look at a couple of battery packs.

    https://www.parallax.com/product/28989

    or

    https://www.parallax.com/product/28988

    depending on the area you have.

    Infernal Machine
  • OK, thanks. But this is the best way to do it, I mean separate power source for the servo motors and the electronics? Or do most of you just use one source for all?
  • PublisonPublison Posts: 9,816
    edited October 3 Vote Up0Vote Down
    Normally you want to keep servo power separate from the electronics because of surges and spikes induced in the servo power supply line.

    Yes, a dual supply line is best.
    Infernal Machine
  • Thanks so much, I'm putting in another order to Parallax today, so I really appreciate the timely reply! :)
  • I'm running a Boebot with two 360 servos, just using the stock 6V (4xAA) battery pack. Working fine, and I'm well beyond the bench demo below, running on the floor. Of course a heavier bot may well need more power.

    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • @Erco - thanks, I'll have to look at my design I was going to do again, and figure out where I want to put the second power pack since the motors need a separate power source than the RPi3/RoboPi combo. Good to know they will work off 4AA if that's all that will fit! :)
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