Smart IoT based water level sensing for overhead tanks - Part 7 (Is ADC pin available on ESP-01 module?)

Unfortunately, ESP-01 module doesn't have Analog pin exposed to the 2x4 connector. The ADC on the ESP8266 is on the PIN#6 of the ESP8266.

To achieve Analog read, ADC can be used in between the Analog input and ESP8266.

The permissible level on the Analog input of ESP-01 module is 0  to 1V. Use a resistive divider to get a voltage between 0  to 1V.

ADS113 is a dual analog input IC. The I2C of ADS113 can be connected to the pins of the ESP01 module. Below are the I2C pins of the module.

SDA	GPIO0	10 kΩ pull-up
SCL	GPIO2	10 kΩ pull-up