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Sounds complicated. Why not use one of the hundreds of I2C and SPI ADC options available on digikey?

A simple PCB in the picrust form factor could implement a high quality multichannel ADC IC, with no microcontroller programming required.

And as a bonus, you'd be able to design it with sane connectorization for your actual application. (eg, appropriate scaling resistor your sensor, tidy two-wire plug or screw terminal, etc)

I'm very pleased that the RPi has stayed focused on not being everything to everyone, and has left these specialized applications to be implemented as peripherals.

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