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I'm using Arduino Mega, and would like to start a DC Motor Pump. In my circuit, there are several sensors that are going to take up the voltage offered by Mega. Hence, I would like to know whether there is a way to control the working (start/stop) of the pump using arduino as the controller while the motor being powered by a 9V battery.

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    use a relay to turn the power on off. This gives you control over the pump, as well as isolates it from the micro-controller
    – Chad G
    Commented Aug 16, 2019 at 16:42
  • A 9V battery doesn't give very much current and doesn't give any for very long. They're usually not good for motors. Generally AA or AAA would be better.
    – Delta_G
    Commented Aug 16, 2019 at 20:56
  • Thanks, So is there any way to reduce the complexity of the circuit as we don't have space for the relay module! We simply need a switch that gets ON upon Arduino's signal
    – buneShot
    Commented Aug 17, 2019 at 0:09
  • How strong is your pump? An optocoppler or a simple transistor are smaller alternatives.
    – Sim Son
    Commented Aug 17, 2019 at 13:50
  • Thanks, its of 3.3V. I've connected it to my accessible motor driver shield of Adafruit v1. Hence I am able to switch it on or off just as any other DC Motor!!.
    – buneShot
    Commented Aug 17, 2019 at 16:12

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