5V DC Input

[italo]

hi, first of all thanks for the great product. it fits 100% to our requirements.

we use the board togehter with home assistant and ESPhome V 2023.5.2.

We like to messure Temperature via NTC sensors. We use this settings.

10K NTC
9.89K resistor
5V DC Power Supply
Connected on INA1

We get a wrong temperature reading. If we connect the 5V DC direkt to the  INA1 input we get max. 3.03V on the GPIO36. As we see you use a LMxxx bevor the ESP32. Is the conversion of the 5V linear
to the 3.3V input of the ESP32? Do you have any hints? as the  reference_voltage we use 3V because of the limitation of the ESP32.

BR
Giuseppe

ESPHome Code: 

sensor:
  -  platform:  ntc
     sensor:  resistance_sensor
     name:  NTC Temperature
     id: INA1_TEMP
     calibration:
      b_constant: 3950
      reference_temperature: 25°C
      reference_resistance: 10kOhm
   
  # Example source sensors:
  - platform: resistance
    id: resistance_sensor
    sensor: INA1
    configuration: DOWNSTREAM
    resistor: 9.89kOhm
    reference_voltage: 3V
    name: Resistance Sensor

  - platform: adc
    id: INA1
    pin: GPIO36
    attenuation: auto
    update_interval: 5s
    name: "INA1"