Laser Tag Bow

thingiverse

This is part of a laser tag LARP style system I worked on. The entire system is open source so if you want to contribute check out https://github.com/moonbeaminteractive. The bow uses a rotary encoder in the arm axis to trigger a fire event with an arduino pro mini, an infrared led and a laser for targeting. The infrared tube has a internal ring set at 45mm which allows the IR LED to be pushed into place without having to worry about focus. I also printed the LED holder with a small aperture in order to keep the spread down. The Normal width of the LED gets magnified to about 6 feet over 20 meters without the aperture. Here is a video of the bow firing. You'll need: 1 google cardboard lens 45mm focal length 1 arduino pro mini or similar small controller board 1 IR LED 1 laser pointer module (optional) some small gauge weed eater cord for the bow string some #2 1/2" and 3/8" wood screws for securing parts if they are loose 2 104 ceramic capacitors for hardware debouncing the rotary encoder (very much needed) 1 50R - 150R resistor (depending on fire time for LED. Lower means brighter and a longer projection for the IR signal but could burn out the LED if left on to long) Print Settings Printer Brand: MakerBot Printer: MakerBot Replicator 2 Resolution: 0.35mm Infill: varies by part Notes: Bigger parts can use infill. The bow handle can be 35 to 50 percent infill. The Arms I printed had 20% infill and came out very light. The laser site is best with no infill at all as it needs to be as light as possible. void setup() { pinMode(3, OUTPUT); // Laser Site pinMode(2, OUTPUT); // Infrared LED } void loop() { if (encoderPos > 0) { arrowKnocked = true; } if (arrowKnocked == true && encoderPos < 1) { digitalWrite(laserSite, LOW); delay(100); } else if (arrowKnocked == true && encoderPos > 0) { digitalWrite(laserSite, HIGH); delay(100); } }