I sell software - machine code for Arduino for project Paintball Domination Timer with RFID user entry. Based on individual agreement i can offer firmware for 4 teams. Standard price is for 24 RFID cards (10x RED, 10x GRE team, 2x Ref, 2x Eraser)

RFID Domination Timer description:
Domination timer (DOMINATOR) is a stopwatch device designed for 2 teams that play against each other and try to occupy the point and keep it for as long as possible. The stopwatch is suitable for Paintball game mode DOMINATION, resp. Capture Hill. They consist of an ATmega328P microcontroller (AVR), which can be part of the Arduino development kit (Uno / Nano / Pro Mini). An LCD character display (size 16x2 or 20x4, chipset HD44780) is used to visualize times of both teams.

The times are listed in two lines below each other and are dynamically updated if there is an active team at the point (a point occupied by a team). The stopwatch is equipped with indicator LEDs in team colors, which signal the active team at the point and a detector (piezo transducer), which announces the change at the point after attaching the RFID card.

Teams are implemented in the game - RED team and GRE team who play against each other and try to occupy the point and then keep it for as long as possible. At the beginning of the game, the display shows the times 00 hours, 00 minutes, 00 seconds for RED team , GRE team . Each team member is equipped with an RFID chip that is integrated into the bracelet (or card / keychain). The RFID chip transmits its unique identifier - UID (unique ID), which is read by an RFID reader and verified in the logic of the system to which the entity (team) belongs.

Individual bracelets can be color-coded (red, green by team and entity function), which allows them to be distributed more quickly to players, but also archived and stored by color. The RED team will occupy the point when the RED team member attaches their card to the RFID reader. This action triggers a buzzer that announces the change of point with a short beep. Subsequently, the LED of the RED team at this station will light up and the display will start adding the time for this team until the member's team card is inserted , Referee , or Eraser . If the point is occupied by a GRE player and the card is attached to an RFID reader, the buzzer will announce this change with a short beep, the GRE LED will light up (RED LED turns off), RED's current time stops , and GRE's time is scored.

If the Referee attaches his RFID card, the running time will stop at the current value. The point es neutral, the active team's LED goes out. The stoppage lasts until a member of the RED team or the GRE team presents their card. This type of card is thus suitable for temporarily stopping an ongoing game, controlling a player's intervention, or injuries. At the same time, the card can be used at the end of a round of the game, to evaluate the round, respawn teams before continuing.

If Eraser attaches the card, both times will stop and reset to the initial value of 00 hours, 00 minutes, 00 seconds, which will be displayed. The Eraser card is used to restart the game, to initialize a new game without the need for a power-on cycle. The RFID reader responds to the insertion of an RFID card immediately, including the entire logic of the Dominator project. The project is suitable for events, sports facilities, or teams, which can build a Dominator device with their own hardware. Firmware is universal, which is based on the wiring diagram, it is also possible to use the available PCB design for the production of printed circuit boards. Advantage is, you can clone firmware to as many devices as you want.

Compatible hardware:
Arduino (Uno or Nano)
RFID reader RC522
LCD character display 20x4
I2C converter
Buzzer
RFID tags (wristbands, cards, keychains)
2x LED