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How to power both arudino and motor from same source

Discussion in 'Sensors and Actuators' started by red913, May 7, 2013.

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  1. red913

    red913

    23
    0
    Mar 22, 2013
    So my Arduion Uno takes 7-12 volts and the motor I run takes about 6V. The uno can handle up to 1A and the motor pulls about .8A but spikes to about 1-1.1A on startup. So I'm thinking if I found a 1A power supply that's at anywhere from 7-12 V then I should, with proper resistors, be able to send power to both right or would I need something along the lines of say 1.5-2A power supply? Also I'm looking for a simple plug in the wall type that's already made. Do you think I may have to make my own power supply? Just want to see what kind of options I had here. Any advice would be appreciated. :)
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    No the UNO might require only about 1A, you could hook a bazillion Amp power supply to it without issue...

    2.5A or above would be preferable...

    Wall warts and adapters all over Ebay for a few bucks...

    Example http://www.ebay.com/itm/NEW-9V-3000...338?pt=LH_DefaultDomain_0&hash=item415f6e2d62

    I would get a 9V supply since they are cheap and readily available at the voltage and will work well with the UNO... Simply drop off a few volts with a few series diodes (4 1N00x diodes should work nicely) to run the motor at the recommended voltage...
     
    Last edited: May 7, 2013
  3. red913

    red913

    23
    0
    Mar 22, 2013
    Thank you very much. Also, why use a diode over a resistor if reverse voltage protection is not an issue?I could calculate the resitor needed. But I'm assuming the didoe is for simplicity, right? I did a quick search and I guess those will always drop about .7 or 1v, depending on who you ask.

    Oh ya, do you think regulate vs unregulated power supplies matter in this case?
     
    Last edited: May 7, 2013
  4. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Diode drops voltage but do not restrict current...

    A resistor limits overall current, you will starve the motor on start up or when it's under load...

    Yes it matters, get a regulated one... If not the voltage will spike well past the acceptable 'safe' range when under less draw then specified...
     
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