Hi
I found this.
Analog I/O
Maixduino uses the pwm module of the K210 chip to implement the analogWrite() function. The analogRead() function is temporarily unavailable.In Maixduino, you can configure up to 12 pins of the 48 FPIOs to be Analog Output.
From this site;
https://maixduino.sipeed.com/en/
Tom.... 
