Ping pong electronic counter

thingiverse

We've encountered difficulties with scoring in ping-pong matches. Fortunately, this handy electronic counter eliminates disputes entirely. The player who serves next is clearly indicated by the LED lights. I have added two game modes to choose from: 11 and 21. In the 11-point mode, serve is switched every two points; in the 21-point mode, it's switched every four points. The winner is determined by winning three sets out of five. To build this counter, you'll need the LED&key module - a low-cost Arduino module with numerous possibilities. You will also require: an Arduino Nano (or equivalent), battery contact springs, a 5V booster module (MT3608 step-up power module), a switch (19x6x13mm), two AA batteries, and four small screws. Additionally, I have designed a mount for a mini tennis table. The electronics are easy to assemble. To control the game: choose the winning point threshold (11 or 21 points) by pressing keys 1-4 or 5-8; select which player serves first using the blinking LED lights and keys 1-4 or 5-8; press key 1 or 8 to increment points and serve; press key 2 or 7 to decrement points and serve; stop the game by asking for a "yes" (key 6) or "no" (keys 7+8). The LED light indicates whose turn it is to serve. After each match, players must switch sides, and their points are also swapped so they're always on the correct side. Let me know if you need any improvements.