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ULN2003 and step down modules

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Post Number:#1 Post Mon Jul 05, 2021 11:07 am
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I found this board to connect with the dosing pump and also one to convert from 5v to 12v.
Does it work perfect?
I'm researching and the more plates I find the better

https://pt.aliexpress.com/item/40012077 ... 4440StVljW

https://pt.aliexpress.com/item/40000645 ... 0058389292
Last edited by Fernando Garcia on Mon Jul 05, 2021 1:21 pm, edited 2 times in total.
Reason: Changed the title to a more suitable.

Post Number:#2 Post Mon Jul 05, 2021 1:21 pm
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Hi!

This ULN module will give more problem than solution.

Separated module require more wires and more wires are susceptible to bad contact and so on.

The circuit for dosing pumps or fans is very simple and can be assembled in the prototype shield.

Maybe this picture can make the things more clear to you.

Image


Edit:

This step down module should be used to convert 12 V from power supply to 5 V.

5V is to feed Arduino and others circuits.

Best regards.
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.




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