MicroPython Forum

If it is a 24bit ADC and your Vref is 3.3v then the sensitivity it has to read is 3.3v/(2**24) = 0.00000019669532775878905 volts What sort of hardware would be needed to decouple and isolate the ADC so that such fine voltages are not just inducted from the air?? For this ADC the useful resolution i...

At this time there is no low-cost breakout board available for this device. It is possible to make your own - I added a section to the github repo listing the parts I used.

https://github.com/miketeachman/micropy ... kout-board

If you need a 24-bit ADC here is a driver for the Texas Instruments ADS1219

https://github.com/miketeachman/micropython-ads1219

All device functions are supported in this driver. Tested with uPy v1.10 running on ESP32 port.

datasheet:
http://www.ti.com/lit/ds/symlink/ads1219.pdf

I have some questions though, why you decimate or prune your samples before saving into the SD?. And, how can I achieve full resolution (18bits) from the mic (https://cdn-shop.adafruit.com/product-files/3421/i2S+Datasheet.PDF)? There is now a better way to save full resolution mic samples to extern...

thanks for trying it out. Really glad to know it works on someone else's build ! For the pruning part, I reduced the sample size to 16 bits to reduce the time to copy the samples to the SDCard (which should help to support a higher sampling rate), and to reduce the space used on the SDCard. In my ap...

Thanks for mentioning this work and listing those devices - I'll have to order some and try them out. The PR I submitted addresses a gap in the functionality of the LoBo port. It is missing a core I2S piece, which is about interfacing to external I2S hardware devices via the ESP32 pins, using the I2...

update: PR for I2S support is submitted: https://github.com/micropython/micropython/pull/4471 usage guide and examples describing how to use this new I2S class: https://github.com/miketeachman/micropython-esp32-i2s-examples It would be great if a few enthusiasts could try out this PR and report back...

please check out my answer to your esp32 post
viewtopic.php?f=18&t=5900

I'm not aware of a uPy I2S module for the ESP32. For a project that requires an I2S microphone I ended up writing a uPy module that uses the I2S interface in the ESP-IDF. I'll be finishing that work in a couple of days, then submitting a pull request to the main uPy repo. A few things left to do, li...

As expected, project time "yielded" to holiday time with family and friends ;) But, a few slices of time allowed me to experiment with the Fast IO implementation of uasyncio. https://github.com/peterhinch/micropython-async/blob/master/FASTPOLL.md A time-critical coroutine that handles microphone sam...