WT32-ETH01 ADC input voltage reading is jumping

[kdiamond]

Hi.

I’m trying to read ESP ADC input voltage from TDS sensor, but it jumps randomly from 0,300V to 0,450V. The Sensor output voltage is stable (0,438V) according to my multimeter and osciloscope.

I connected sensor output to one of ADC GPIOS. Should I do anything else to remove the noise?

Is this ESP32 ADC issue as suggested on link bellow?
viewtopic.php?t=5845

Accurate reading of the sensor voltage is absolutely crucial. Should I use extrenal ADC such as ADS1115 for accurate readings?

Thank you for your suggestions.

Br