I spent 2 hours making a simulation of an RC circuit in Falstad for week one of Resoluton-Hardware The circuit leds turn on at the same time and fade outward..

The circuit has a push switch, a 7 voltage power source, and individual leds, each of which having its own resistor and capacitor. I created the visual effect by changing values, which were provided by an RC Time Calculator, of capacitors and resistors. Demo: https://is.gd/EYDeYy