Hello friends! In our previous tutorial, we installed the Arduino LilyPad library for Proteus . Now we will use that board in a small circuit with three LEDs and a pushbutton, then extend the same project to an analog level indicator. Libraries Libraries used in this tutorial Arduino Lilypad Library for Proteus: V1.0 (2014, used in this tutorial) Newer Arduino boards: UNO · Mega 2560 · Mega 1280 · Nano · Pro Mini · Mini (V4.0) 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 LCD Library for Proteus V3.0 : 16x2, 20x4 and I2C LCDs to show your readings The basic behaviour is easy to observe: when the button is released, all three LEDs are on; when it is pressed, they turn off. This ...