MicroPython • Re: Pico with 4 1306 OLED

Thank you guys for the help!

Some of the 'black RP2040 boards' are footprint compatible with the Pico; only differences being voltage regulator and power-related pins, and have ADC3 exposed. For example - https://forum.arduino.cc/t/how-to-get-the-rp2040-spi-to-work/1255597

One of those should be a drop-in replacement for a Pico, especially on breadboard.

I assume this would allow for the fourth ADC to be used? that would be nice for sure. Do they run 5v onboard instead of 3.3V?

Nice These days you don't really need many ADC lines. Just buy some sensor breakout boards, most are I2C. If you ask me these days would I make an analog sensor board and use an ADC line, or get a modern miniature/MEMS sensor breakout board, I'll go for the latter every time. All calibrated, just read the results via I2C. Quality readings without much trouble.

A good one for your car cabin would be an air quality sensor -- rather a bit more expensive than temp sensors and stuff like that, but you can get some kind of measurement of CO2 equivalent and VOC in the cabin, useful I think.

You are talking about interfacing a separate ADC board via I2C? I think that would solve my issue of not having enough ADC ports to use. A CO sensor might be really helpful for safety in the cabin! ill have to look into that for sure. Seems like the addresses are different as well. I was a little worried they would use the same addresses as the oled's I am using.

The schematic says that the Pico's ADC3 is GP29 and connected to Q1 (between pins 33 and 34). Could this simply be desoldered and used as a regular ADC input?

That would definitely be helpful if true. I have no idea for that but if its possible to get ADC3 working in that way it would be very nice.

Statistics: Posted by MR2Taco — Sat Feb 01, 2025 2:37 am

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