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Me and my girlfriend are working on a small automatic plant watering system. Our first goal is to make an electrical 12V pump suck water out of a bottle.

As we were reading tutorials online we noticed that many people hook up a driver such as the l293 to their arduino in order to control the pump (essentially a brushed DC motor).

http://www.ti.com/lit/ds/symlink/l293.pdf

Our pump is 12V 4.2 W.

My question is do we really need a driver like that for just activating / deactivating the pump ?

In my understanding the driver offers an H-bridge setup allowing to control up to two motors in both directions.

Are there any other reasons to prefer this driver instead of a simple MOSFET / Transistor setup with such a simple use case like ours ?

Thank you for your help.

Best regards

closed as off-topic by per1234, gre_gor, jose can u c, KIIV, dhimaspw Feb 6 '18 at 3:56

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about Arduino, within the scope defined in the help center." – per1234, gre_gor, jose can u c, KIIV, dhimaspw
If this question can be reworded to fit the rules in the help center, please edit the question.

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Unless you wish to reverse the direction of the pump without reconnecting the wires in the opposite way, there is no need for a L293. A MOSFET that operates as a switch should be sufficient in your case. You can also try to PWM it and reduce/control the water flow.

  • I was considering PWM as well. I will go ahead and do some reading on it :) – sashok_bg Jan 22 '18 at 13:22

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