Simple robot - wiring separate power supply for drive

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Nerdsville
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Joined: Wed Sep 04, 2013 9:24 am

Simple robot - wiring separate power supply for drive

Post by Nerdsville » Thu Sep 12, 2013 9:27 pm

Hi,

After working through my Experimenters kit I'm about to build my first robot. I'm pretty confident I can write the control sketches, but would like to use a separate power supply for the motors so they don't drain the supply for the Eleven control board.

I just have simple motors (not servos) with a black and red wire to each. How do I control these through the eleven board? All the projects I've made so far control devices that are powered by the board - and now I'm confused because this is different :-)

Cheers,
Martin

andrew
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Re: Simple robot - wiring separate power supply for drive

Post by andrew » Thu Sep 12, 2013 11:05 pm

Use our new HBRIDGE: shield, it's perfect for driving two DC motors with an external power supply:
http://www.freetronics.com/collections/ ... ver-shield

Nerdsville
Posts: 5
Joined: Wed Sep 04, 2013 9:24 am

Re: Simple robot - wiring separate power supply for drive

Post by Nerdsville » Sun Sep 15, 2013 5:45 am

Thanks John,
I bought an HBridge shield from Jaycar and tried it as described on the product page of your website (for controlling a single DC motor) but nothing happens. I've tried the following...

1. Directly connecting battery pack to motor - the motor works!
2. With my multimeter: I have 5v at motor power in terminals...
3. I have 0v at OUT A...
4. Pins D4, D7 and D6 all behave as they should do according to the sketch - both at the shield input terminals and the channel A jumpers.

I even went back to Jaycar and the nice folk there let me try my setup with another Hbridge shield - still zero output.

I'll email your support with photos of my setup.

Thanks in advance for any advice!

Martin

andrew
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Re: Simple robot - wiring separate power supply for drive

Post by andrew » Sun Sep 15, 2013 11:52 pm

replied via email.

Nerdsville
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Re: Simple robot - wiring separate power supply for drive

Post by Nerdsville » Mon Sep 16, 2013 10:50 am

Thanks John,
I hadn't noticed the minimum voltage. 'Tried a 6x AA battery power pack and it works a treat.
Cheers,
Martin

andrew
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Re: Simple robot - wiring separate power supply for drive

Post by andrew » Mon Sep 16, 2013 11:10 pm

Nerdsville wrote:Thanks John,
I hadn't noticed the minimum voltage. 'Tried a 6x AA battery power pack and it works a treat.
Cheers,
Martin
Great news, have fun. :)

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