ADC input 3&4 max range

[milan.zelenka]

Hello,

Any solution for this issue? I have the same problem with esphome, ADC input of my A16 board (on all channel) shows right voltage up to 3.145V, no more. 

It works perfect in range 0 - 3.145V, it shows right value. Above 3.14V it shows still 3.14V.

I used very simple code:

sensor:
  - platform: adc
    pin: 39
    name: "A4 Voltage"
    update_interval: 1s
    unit_of_measurement: V
    attenuation: 11db


I think it depends on attenuation value. With attenuation: 0, it works only up to 1.1V. According to documentation, attenuation can be set to this values: 0db, 2.5db, 6db, 11db, 12db, auto, but nothing works correctly in range 0-5V.

Thanks for any observations.

M.