Analog sensor isolation for Raspberry-Pico analog pins

[LeanSol345]

Hello, I’m designing a logger to collect data from a thermocouple (may be any type) using Raspberry Pico (3.3V). I want to isolate analog pins but signal should be proportional to the input signal. As per my study inductive isolation can be done to transfer power proportional to the input analog signal.

Suggest a reliable way of isolation and ICs as per my requirement. Please mention if there is any alternative to transfer signal proportional to input.

 

[KlausST]

Hi,

a simple and - signal wise - perfect method is to use a thermocouple to digital (SPI) converter and use optocouplers to isolate the digital signals.

If you want to isolate the analog signals, just do simple search for "analog isolator" .. or similar. Various approaches has been discussed here in this forum and many more in the internet.

Klaus