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New port expander plugin
#2
@astrogerard

Hello Gerard 

Received my order of (5) pcf8574 modules today. 

Songhe PCF8574 PCF8574T IO Expansion Board I/O Expander I2C Evaluation Develop Module (5pcs)

 https://www.amazon.com/dp/B07XD2K4GH

Sorry in advance for the NOOB questions. 

Was wondering how to connect them to my 3B+

I understand that the Pi has two I2C connection pins. 

Furthermore how do I avoid pulling too much power over those pins and causing damage to the 3B+?

I have read that some have killed their Pi because of that even though the modules were powered by an external source. 

How do I mount the PCF8574s?  There are no mounting holes and I can’t imagine letting them dangle in the air. 

Thank you for your time and assistance. 
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Messages In This Thread
New port expander plugin - by dan - 2021 Oct 19, 04:47 PM
RE: New port expander plugin - by HereComesTheRain - 2021 Oct 31, 01:31 AM
RE: New port expander plugin - by astrogerard - 2021 Oct 31, 07:08 PM

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