This slot machine project uses 15 colored LEDs for three reels, operated by a single push-button that powers the device, starts the reels, and resets the game. It shuts off automatically after eight minutes of inactivity. You can choose LED colors like red, yellow, green, pink, and blue.

Three CD4017 counters control the reels; each has its own clock circuit powered by a CD40106B CMOS Hex Schmitt-Trigger and a resistor-capacitor combo to set spin duration.

A 6 mm mounting hole on the PC board fits a NO/NC SPST momentary push-button switch, which is wired to COM, NO, and NC terminals. The switch used is listed here. Battery connections are on the board edge for a 9-volt clip.

LEDs are mounted on one side of the PCB, with components on the opposite side. The file SlotMachine.zip includes the KiCad files and a PDF template for drilling holes in the enclosure for LEDs and a switch. The recommended enclosure (part PBS-11532-B) measures 4.37” x 3.25” x 1.5” and fits a 9-volt battery, available from DigiKey, Mouser, Techni-Tool, and Vetco Electronics.

This PC board was assembled by PCBWay; final assembly required adding the push button, battery clip, and case installation. I connected the switch using jumper wires intended for breadboarding.

YouTube Link https://youtube.com/shorts/SafDvGwXbNk?si=XxPYlz5tUSNEevR7