This game utilizes two tricolor LEDs. One LED randomly lights up in blue, green, or red. The second LED cycles through these colors in a random order—blue, green, and red—at least once before both LEDs turn off, approximately four seconds later. This process then repeats. The setup is intended for two players, whose goal is to press their button when the illuminated colors match\

Each LED activation constitutes a round. Two potentiometers control the speed of each round and the speed at which the second LED cycles through colors, respectively. Each player has three LEDs to display their score: the first illuminates at 3 points, the second at 6 points, and the third at 9 points. created.  A third tricolor LED will light up in red, green, or blue to indicate the winner.

I recently redesigned the board so that all the LEDs are on one side and all other components are on the opposite side. The board mounts on top of a project case with holes drilled for the LEDs. The board has four corner holes for mounting, or you can use double-sided foam tape.

For scoring, I suggest using different-colored LEDs and push buttons for each player—red, green, and blue LEDs work well. I have used combinations like (red and green), (red and blue), and (blue and green). The third LED, which indicates the winner, is controlled by two jumper wires on each side of the board. From left to right, the jumper connections are labeled JmpP1, JmpR1, JmpB1, JmpG1, JmpR2, JmpB2, JmpG2, and JmpP2. If Player 1 is red and Player 2 is green, solder a jumper wire from JmpP1 to JmpG2 and another from JmpP2 to JmpG2. In this setup, the tri-color LED will light up either red or green depending on who wins.

You can find the KiCad project files as a zip under “other files for assembly.” Inside, there’s a template.pdf that you can print and use to guide your LED drilling. To secure the template to the top of the case, I suggest using an adhesive like Elmer’s All Purpose Glue Stick. The case I selected has a small center mark on its top, which helped me align the template—just punch a hole in the template at that spot. Once you finish drilling, simply soak the template in warm water with dish detergent or soap to remove it.

For the illuminated push buttons, utilize a 16 mm drill bit; for the power switch, use a 12 mm drill bit; and for the potentiometers, employ a 9 mm drill bit. The potentiometers include a small tab that requires a 3.2 mm drill bit to create an appropriate hole. To accurately mark the location for this hole, position the potentiometer with the shaft facing inward and the solder lugs pointing downward inside the enclosure. Use the tab to make a slight scratch on the exterior of the case, which will serve as a guide for drilling the tab hole. 

Resistors R7 and R14 serve as current-limiting components for LED push buttons. Since the specific push buttons selected do not require these resistors, jumper wires or zero-ohm resistors may be substituted as appropriate. The inclusion of space for these resistors is intended to provide enhanced design flexibility.

The button belonging to the winning player remains illuminated, and a brief sequence of notes plays until the game is reset. To reset the game, you can turn the power off and back on, or add a normally closed, momentary push-button in series with the power switch to serve as a reset button.  

The notes are produced by an optional circuit. Optional circuit Note Sequencer https://www.pcbway.com/project/shareproject/Note_Sequencer_Updated_7_16_2025_5b2919b3.html

Connect potentiometers, push buttons, power switch, battery connector, and the optional tone sequencer circuit to the PC Board using header pins and female-ended wires. The Note Sequencer attaches to the output pins labeled “GND 9V+ Low on Win” (matching the sequencer’s “-,9V+,Start Low”). Alternatively, you can add an active piezo buzzer to beep when the game ends by connecting it to 9V+ and Start Low; GND is not used in this case.

YouTube video https://youtu.be/gYBMlOfJTuA?si=EvH6nGLHjCtxcqD1

Suggestions for a name for this project: Rainbow Match, Rainbow Reaction, or LED Match.