Flash Twenty LEDs Using Arduino

The Flash Twenty LEDs Using Arduino project centers around an Arduino Nano microcontroller programmed via the Arduino IDE to control a display of twenty colored LEDs, designated LED1 through LED20. Because controlling twenty individual LEDs directly would exceed the normal pin limitations or current output capabilities of a standard microcontroller without multiplexing or shift registers, the circuit orchestrates them systematically. A potentiometer (VR1) connected to one of the Arduino Nano's analog input pins acts as a manual control knob. As the user adjusts VR1, the analog voltage read by the microcontroller changes. The Arduino software maps this voltage value to determine the delay time between flashes. The microcontroller then executes a routine that randomly selects and drives one of the twenty LEDs at a time, turning it on briefly before moving to the next. Resistors are integrated into the circuit to limit the current flowing through each LED, protecting them from burnout. Power is supplied to the entire circuit using either a 9V battery or an external DC power supply, which provides the necessary voltage for the Arduino Nano and the connected components, typically routed via a breadboard or a custom PCB.