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. 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 gives us a useful first exercise in input configuration, output arrays and the relationship between a circuit and its program. The original article described a button demonstration but supplied code that read an analog input and mapped it to an LED count. We will explain that difference and provide separate versions for the two behaviours. The original screenshots and project download are retained, with the revised wiring and cod ...