The original m5stack uses an analog speaker amplifier circuit. The core 2 uses digital so you'll need to use something like https://github.com/earlephilhower/ESP8266Audio in order to store files in flash/sd/internet and play them back over i2s.

I've had great quality and volume coming through the speakers this way. I suggest you look into the github link I posted for examples, they have totally complete examples using internet sources but if you just read the examples on that github you can see how to adopt it for sd/spiffs files with ease.

@felmue said in Light / Deep sleep example:

Hello @jesse-schein

When everything is powered down except for AXP and RTC (e.g. shutdown mode / RTC sleep mode) I measure a current at the battery of about 0.263 mA = 263 uA.

Thanks
Felix

Thanks so much! Thanks for all your contributions around the m5stack details, m5stack team does a pretty good job at describing the products but you really help out! Thanks again!

@felmue
With your recent commits to the github library, will RTC sleep mode with the IRQ actually turn off everything (ESP, AXP, LDO2,LDO3, DC boosts)? It will just leave the RTC on since its connected to LDO1?

Does this result in super low deep sleep current in the microamp range? I tried to look at the AXP192 data sheet to see what the LDO1 quiescent current is but didnt see anything listed. I'd imagine just external RTC on is basically no power? And I can use that to wake the ESP32/AXP192 backup since the AXP192 is in powermode A since LDO1 is tied to Sys_en on the AXP192?

Or does this completely stop the current since the RTC has its own battery it looks like?