measured battery voltage does not change

[nukutoki]

Hi,
I am using the battery voltage example.
The measured battery voltage is always 4.04V (if no USB is connected). I am using this board. Should the example work on this board or do I have to connect the GPIO35 somehow?
Thanks in advance.

[LilyGO]

Hello.The battery check function is available only for 2022-7-28 V1.2.

[nukutoki]

OK, thank you for the fast reply.

[giannoug]

@LilyGO So how can we check battery voltage for 2022-5-22 V1.1?

[LilyGO]

Hello. Only V1.2 has the function of detecting battery voltage

[giannoug]

Which pin of the board has battery voltage? VBAT? We could be able to use a voltage divider to calculate it

[LilyGO]

V1.2. The IO35 can capture battery voltage

[giannoug]

For V1.1, can this be achieved with external components like I mentioned above?

[LilyGO]

I'm sorry. V1.1 does not have a GPIO for ADC to detect battery voltage