ESPHome - eINK display battery sensor

ESPHome
1

Hi,
I have a LILYGO TTGO T5 V2.3 2.13 Inch E-Paper Screen with built-in battery connector on the board.
I connected a spare 3.7 battery and that seems to be working fine.
Now I am trying to figure out how do I get the battery level in ESPHome?
On the board close to the battery connector there is a text saying BAT_TEST_35 so I tried to use adc platform

sensor:
 - platform: adc
    pin: 
      number: 35
    id: "VCC"
    internal: true
    
 - platform: template
    name: "eink_battery"
    unit_of_measurement: '%'
    update_interval: 60s
    lambda: |-
      return ((id(VCC).state /3.30) * 100.00);

but that gave me this error:

mapping values are not allowed here
  in "/config/esphome/epaperclock12.yaml", line 41, column 8:
        pin: 
           ^

Is that the right way to do this?
Thanks

2

No, the indentation/spacing of your yaml is wrong, check the examples how it should look like:

3

maybe just use the basic option on pin

sensor:
 - platform: adc
    pin: 35
    id: "VCC"
    internal: true
    
 - platform: template
    name: "eink_battery"
    unit_of_measurement: '%'
    update_interval: 60s
    lambda: |-
      return ((id(VCC).state /3.30) * 100.00);
4

the indentation/spacing is still wrong in your yaml snippet :point_up: