ESP32 Temperature sensor Test
esp32 as the MCU, get temperature from NTC 100K thermistor temperature sensor for 3D printer.
the touch screen displayed the temperature from the thermistor, while the right side is a thermocouple thermometer that displayed the hotend temperature.
someone critical the temperature sensitive with esp32 internal ADC, so I do a test. it seems that it can not get the right temperature value below the 30 degree and above the 250 degree.but that temperature is ok for our normal print.