Hello friends! Today we will read analog voltages with an Arduino Uno and display both the ADC readings and calculated voltages on a 20 × 4 LCD. We will build the circuit in Proteus, connect the display, write the sketch and work through the conversion from a digital count to volts. Libraries LCD Simulation Libraries Latest library: LCD Library for Proteus V3.0 (October 2026): LCD 16x2, LCD 20x4 and both I2C LCDs in one library, with our own HD44780 model and an Arduino demo One LCD only? LCD 16x2 · LCD 20x4 · I2C LCD 16x2 · I2C LCD 20x4 Helping Tools Serial Monitor Advance : a serial terminal window for the UART of your board Serial Monitor Expert : the serial monitor with extra debugging tools The central idea is simple: analogRead() returns a number that represents the input relative to ...