ESP32 Forum

Hello everyone,
I'm looking to a way to detect if my LilyGo-T-Call-SIM800L is powered from USB-C connector or if running from battery.
My first option was to add an extra power supply (220VAC to 5V) connected only to a GPIO pin and detect if there is power. I wish to avoid this solution so save a second power suply unit on the project.
My second option was to connect the 5Vdc coming from USB-C to one of the GPIO pin. The problem here is how to get USB-C 5v. USB-C connector has a very small pins and I wan't be able to solder a wire without destroy the whole PCB.

Anyone knows if is possbile to detect power source on LilyGo-T-Call-SIM800L.
Actually I'm using Adafruits_FONA library where I should be able to measure battery capacity but not power source.
many thanks

hi,

- does your development board have access to the 5V, 3.3V, and GPIO pins for example on a pin header? the battery voltage may also be available as VBAT?
- to detect battery voltages using a GPIO pin, in hardware configuration first drop the voltage down through a resistive voltage divider (example values 300k, 100k), you could use one GPIO pin for each of VUSB and VBAT
- it is not recommended to connect any voltages over 3.3V to any GPIO pin on ESP32, or you might fry your ESP32 or encounter other problems
- in your application, ensure that the dropped down voltages are routed to an ADC pin, then configure the ADC and measure the input voltages

Please check your PMU. in this case

https://gist.github.com/me-no-dev/7702f ... f322250b57

Or

AXP192 PMU
https://github.com/cyberman54/ESP32-Pax ... /power.cpp