I was successful in recording something like a wave form with the following code:

from machine import I2S, Pin import array mic = I2S(I2S.NUM0, ws=Pin(0), sdin=Pin(34), mode=I2S.MASTER_PDM, dataformat=I2S.B16, channelformat=I2S.ONLY_RIGHT, samplerate=16000, dmacount=16, dmalen=256) b2 = array.array("h", 4096 * [0]) mic.readinto(b2)

However, there seems to be a systematic offset around ~+1000. Not sure what is going on here. Could it be related to PDM encoding and the I2S clock? Also, I experience values that are larger than the 12bit precision documented somewere

def eval(): mic.readinto(b2) print(min(b2), max(b2), sum(b2)/len(b2)) for i in range(1000): eval() ... 48 1963 1017.062 811 1237 1027.727 927 1122 1021.952 849 1286 1023.281 763 1719 1029.73 102 1966 1015.185 -903 2878 1012.832 -788 2683 984.9133 -1524 2761 982.3828 -815 3075 986.0596 -864 3044 980.6567 -713 2904 993.0678 -669 2615 1014.595 -138 2182 1022.794 -73 1954 1018.482 ...

I was in the same situation.
I failed to update the board definitions that were already installed on Arduino IDE 1.8.19.
Eventually, reinstalling the board definitions solved the problem.

Specifically, I uninstalled the M5Stack board definitions on Arduino IDE 2.0, then added the URL for the board definitions, restarted the IDE, and then installed the M5Stack board definitions, which was successful.

@fletli I have a video going up soon on how to get it to work in Micropython which turned out very easy in the end.

Hello @goochiecobbler

I am happy to hear it worked. And thank you for reporting back and posting the working code.

Thanks
Felix

@felmue Hi, thanks for the reply. I'll look into it :D

@juanjosecastillo Will it run on USB power?

Hi @felmue,

I see on GitHub that your pull request has been merged, but it hasn't yet been published as a new version release of the Arduino library (which I confirmed by uninstalling and reinstalling the library). The latest library version is still set as release 0.0.2 from July 24, which indicates that there are 2 commits that have been made (yours and Tinyu's) since the release. Not sure what M5Stack's process is for releasing new versions of libraries, but it is interesting to see how sausage is made.

what do you mean by "Not able to subscribe" ?
Does it not connect or does it not return data?
Does the data turn up in HiveMQ?

This looks like Micropython but the functions look strange, you have SSL set to true but no keys and certificates set.

Hello@MoodyGeorge

An example of adding M5.lcd.drawJpg to M5StickC.
anoken/m5stickc_arduino.ino
https://gist.github.com/anoken/8b0ce255e9aef9d1a7f4d46272cedcaa

reference
https://twitter.com/nnn112358/status/1218447646009937920

Hello @kazokutchi

From below comment I assume M5Stack engineers decided to not include the SetChargerCurrent() function for M5StickCPlus.

// Not recommend to set charge current > 100mA, since Battery is only 80mAh.
// more then 1C charge-rate may shorten battery life-span.

That said, have you tired to only copy the function by itself into the corresponding AXP192.cpp file of the M5StickCPlus library?

Thanks
Felix