m16v2 - Unable to read voltages

[admin]

because the default LCD is showed  "voltage_2"

display:
  - platform: ssd1306_i2c
    model: "SSD1306 128x64"
    address: 0x3C
    lambda: |-
      it.printf(0, 0, id(roboto), "T: %.1f°C", id(temperature).state);
      it.printf(0, 20, id(roboto), "H: %.1f%%", id(humidity).state);
      it.printf(0, 40, id(roboto), "AC:%.1fV", id(voltage_2).state);

you can replace :        it.printf(0, 40, id(roboto), "AC:%.1fV", id(voltage_2).state);       with 

it.printf(0, 40, id(roboto), "AC:%.1fV", id(voltage_1).state);   or
it.printf(0, 40, id(roboto), "AC:%.1fV", id(voltage_3).state);

voltage_1   voltage_2     voltage_3    means different voltage detect channel.