I am using ESP32 , TFT display (240x240) and  external 16 bit ADC module (ADS1115) to measure voltage.I  I just want to show you my simple voltmeter sketch. I am comparing my project with a real multimeter and results are quite good. I haven done any calibration and no external components are used. Parts used in project: ADS1115 Module:  Esp32 development board: TFT Display 240x240 : Code (Arduino IDE) :  Library: If you learned something please subscribe! You can support this channel and buy me a coffee. Thank you! #ESPADC #ADS1115 #VoltmeterDIY