OpenTracerUnit is a set of arduino code and 3D designs for an assortment of airsoft guns.

The project was started during lockdown partly due to boredom and partly because I wanted to learn some arduino code. I had just bought a Golden Eagle M870 and wanted to use tracer BB's at my local field's night games. Because it is a gas gun there is no option to link to an electronic trigger so the unit had to be self contained.

Aims

• Be able to light up green tracer BBs
• To not interfere with the iron sights
• To be as cheap as possible

Gun Compatibility

• Golden Eagle M8871

Battery Compatibility

• 11.1 Li-Po (because I plan to just stuff it in the end of the magazine tube)

Future Improvements

• Better power delivery with ability to build in USB charging (USB-C ideally)
• Smaller battery, with ability to integrate it with design (1S Li-Po). This will likely involve switching to a 3.3V logic
• More guns added to CAD design library

In Progress

• Slim down code to run as fast as possible

Completed Improvements

• Break code out into functions to simplify and make it easier to add features to
• Auto recalibrate if LED stays on for over X pulses

Skills/Equipment Required

• Soldering Iron
• Snips
• Ability to flash arduino code
• Hot Glue Gun
• 3D Printer/Somewhere to get it printed