Hello friends! Today we will extend our single and double LED flasher into a multiple-LED display using a 555 timer in Proteus ISIS. Two groups of LEDs will alternate, making a repeating pattern without a microcontroller. Adding LEDs looks simple in a simulator, but it changes the electrical load. We will therefore calculate the current in each branch, add the branch currents to find the load on the timer, and use a standard astable circuit whose timing is easier to predict. The original decorative arrangement and download remain below. We will keep its visual idea while explaining the changes needed for a sensible physical build. In particular, do not copy the original 10 Ω LED resistors without evaluating the supply voltage and current. Figure: Multiple LED alternating pattern in Proteus ...