asandford
Posts: 1997
Joined: Mon Dec 31, 2012 12:54 pm
Location: Waterlooville

Re: 16 Channel GPIO Input Expander

Sun Feb 07, 2016 2:17 am

kourpetis wrote:it uses SPI to connect with the raspberry pi, but it reads analog. If the multiplexor is feeding it with analog wouldn't i get those reading through the ADC to my raspberry pi GPIO ?
No, the original circuit is a digital input multiplexer. You could use a couple of these instead.

asandford
Posts: 1997
Joined: Mon Dec 31, 2012 12:54 pm
Location: Waterlooville

Re: 16 Channel GPIO Input Expander

Sun Feb 07, 2016 2:24 am

kourpetis wrote:The purpose is to read 16 analog devices, the GPIOS can tell to the multiplexer witch channel to read and provide this read to the ADC, then through SPI i can read that particular channel. Am i right ? am i missing something here ?
Use 2 of these, instructions for use here

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