I am using heltec wifi kit 32 for my project. I was wondering if I could do any ADC read for the current battery voltage value?
Do you mean Heltec Wifi Kit 32?
Is this the board that you have?
If this is the board that you have, you can follow this pinout to decide which pins to use. It is better to use pins that are not shared with the oled or the Lora module. For example: GPIO12 or GPIO 13.
I hope this helps.
I am using this wifi-kit. I am not able to identify the gpio that’s connected in-built battery to read voltage values from it.
Accordingly to this discussion:https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/issues/10
It seems to be GPIO32.
I found other article: https://hackaday.io/project/27791-esp32-lora-oled-module/log/69600-battery-voltage-measurement
And it mentions that the values read from the pin don’t make sense.
Probably, you’ll need to add a voltage divider to read the input directly from the battery.