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I want to design a new board that will read temperature with an NTC and a k-type sensor and I want some Bluetooth connectivity. I have heard that the ESP32 has some noisy analog inputs? Is there any truth to this and can I mitigate this with pulldown resistors and small capaictors?
I have designed with ESP32, But don’t have experience with its analog inputs.
Even I’ve heard about issues with analog inputs for earlier releases, I’m not sure if that’s the case still with new variants.
Interesting, I hadn’t heard about noise on the inputs. Seems like I’ve programmed this sort of thing (though probably not ESP ADCs) to take a number of readings and average them together for data points.
Per a previous post https://discord.com/channels/1130679493799977062/1230604933699600495/1301970745580195871 I’ve been thinking about using an ESP32-based datalogger and its analog inputs for measuring CR2032 performance over time, so hopefully the ADCs are not TOO bad. The linked product there might be something to consider for inspiration on your design. I haven’t tried it, but the device seems to have some very good features, especially for its ~$30 price tag.
@techielew @jeremycook Thanks for the replies guys, I think I’ll also just give it a go and see if it’s accurate enough for my needs
Nice, would be interested to hear about your results.
Yes I have, currently on one now
Yes, using ESP32 in your design will add a connectivity layer to it which is pretty cool, I can send you some reference design for esp32 to enable in your board design.
Analog input is not necessarily the main issue, you can always assign that using your software code. Unlike Arduino that has dedicated analog input, esp32 board you will need to assign it in the code
A reference design would be very helpful!
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