What's inside, how it works?
Stopwatch that works similar to chess clock, it can count time for only one team at the moment.
It is equipped with RFID reader that is able to read RFID cards and wristbands of players.
Domination Timer is operated by 8-bit microcontroller AVR ATmega.
LCD character display is used for displaying 2 up to 4 teams total occupying time.
Player is able to occupy point by attaching his RFID wristband to RFID reader. Time starts to count, beep will annouce change on the Domination Timer point.
Onboard LEDs are showing actual color of active team, piezo buzzer inform about event of RFID card attached to the RFID reader.
Everything is soldered on custom PCB that exists in two version depends on 2 or 4 teams firmware support.
PCB supports hotswapping of the main components without need to solder anything.
Suitable for up to 4-day non-stop operation (MilSim, LARP compatible) with power consumption around 60 mAh.
If team is active on the point, time is counting, until there will be attached wristband of other team's player, or when Referee attach his pause card, or Eraser can pause and reset time using his card.
Advantages of the system
Sport friendly
Can be used for Airsoft, Paintball, Nerf wars or similar sport. Possible to implement more than 100 RFID tags per each entity. Suitable or LARP, MilSim events.
Scalable
Easily scalable for 1, 2, 3 or 4 teams per game with two custom PCBs. User can clone firmware to multiple devices to make more props around playground that reacts on the same RFID tags.
PCB design
Explore our pin headers for hassle-free component hotswapping. Check out the second PCB version featuring a cutout for easy access to the contrast control trimmer.
Power options
Device can be powered by PC USB output, or powerbank with 5V USB output directly, or via 9V Li-pol battery (requires soldering).
Photogallery:
Schematics (wiring diagrams):
Hardware
List of supported hardware (PCB compatible):
- Arduino Nano V3.0
- LCD 2004A (20x4) with I2C converter, 5V operated
- NXP RFID RC522 (13.56 MHz), 3V3 operated
- ISO/IEC 14443-A RFID wristbands, cards (MiFare 1K tags - 13.56 MHz)
- Buzzer, 7.62 mm pitch, 5V operated
- 5mm LEDs, THT resistors (220Ω up to 1K based on LED color)
- Uno, or standalone AVR ATmega328P chip with external 16 MHz oscillator (not compatible with PCB design)
- Pullup THT resistors for I2C bus: SDA, SCL signals (10K)
- Standoff Spacer Screws, 10 mm base + 6 mm M3 thread (plastic / brass) / threaded rod can be used (if unit mounted on the wall)