Multiple circuits using same GPIO pins?

Brian71583

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I am looking in incorporate the power controller and the dosing controller from the official guides.

Power:
https://learn.adafruit.com/reef-pi-power-controller
Dosing:
https://learn.adafruit.com/reef-pi-guide-5-dosing-controller

These both require a few connections to GPIO pins (obviously) but there are 3 pins that BOTH require. I have read some pins can handle multiple things but I cannot seem to find WHICH pins can. I know SDA and SCL can but cannot find anything about the others.

The common pins between these projects appear to be 27,22, and 5. Can those pins support both the power controller and dosing pump circuits?

I'll also attach the pics of the circuits to save you the time of clicking the guides.

components_Screen_Shot_2019-02-15_at_10.05.25_PM.png


adafruit_products_Screen_Shot_2018-09-03_at_9.49.18_AM.png
 
No. If you share them , you will not be able to control them independently
 

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