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I am looking for a cheap and not so space consuming motor shield for my Arduino Nano ATmega328. I would like to charge the whole thing with a 9V battery. The shield must have at least 2.1A of output current so I can run 3 brushed DC motors on it. There will also have to be some pins left for a Bluetooth card and 3 analog pins for sensors.

Do you know any shields that meet my requirements?

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In short:

Nano + Shield = no possible


[...] 9V battery. The shield must have at least 2.1A of output [...]

You can't invent power out of nowhere.


Options for the shield

Option 1:

Use an other Arduino. It will simplify everything.

Option 2:

Use a Nano to Uno adapter.

Option 3:

By an Uno shield and connect it pin by pin to the Nano.

Option 4:

Use MOSFETs. They'll work fine for what you are trying to do.


Options for powering

Option 1:

Use a 2s lipo. Voltage is above 5V so you have to reduce it with a down converter, but you should have enough juice for the motors.

Option 2:

Use a lot of AA, some in series to augment the voltage and then in parallel to augment the current.

Option 3: (just the the crazy minded)

Use a lead-acid battery (aka car battery).

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  • Is there a way, when using MOSFETs to switch the direction of the motor's rotation?
    – user29519
    Dec 29 '16 at 16:39
  • H-bridge. youtube.com/watch?v=iYafyPZ15g8
    – Dat Ha
    Dec 29 '16 at 16:40
  • But why can't I use the regular 9V battery?
    – user29519
    Dec 29 '16 at 16:54
  • 9V doesn't have enough current.
    – Dat Ha
    Dec 29 '16 at 16:55
  • What is its current?
    – user29519
    Dec 29 '16 at 16:55

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