How does freETarget work?

freETarget has four microphones placed just behind the target. Located at the 12, 3, 6, and 9 oclock positions, they listen for the sound of the projectile going by. As the projectile goes past a counter is started, and using the time difference between the microphones the firmware figures out the location of the hit.

The projectile location is transmitted to a PC which puts the score on the display and keeps track of your score.

What are the design goals?

We wanted freETarget to be accessible to a wide variety of users regardless of where they live in the world.

  • Low cost parts
  • No export barriers on components
  • Limited technical expertise
  • Use indoors or out
  • Easy to assemble on site
  • Support both pistol and rifle use

Putting all of this together, freETarget uses a PC laptop as the display device, and connects to the acquisition hardware using a long USB cable.

Does it use WiFi?


For some locations WiFi is hard to use and requires a certain amount of expertise to setup. Instead the PC connects to the target over a long 16 meter USB cable (Amazon https://www.amazon.com/gp/product/B07JKX5ZTB or similar). This make it easy to connect and you don’t need an additional power cable to the target. Open up the settings on the program and select the COM port.

Can I use it on other ranges and targets?

In principle yes. Right now it works for a 10 meter air rifle and pistol, but that’s only because of the time we have to work on it. The same circuit will work for any target up to 1000 meters. Download the software from the GitHub and make the changes to the range.

Will you take it back if I can’t get it to work?


freETarget is a community based open source project that relies on the user’s to make it work. This is not a commercial product that you can call customer support for. If you cannot carry out the technical tasks in https://free-e-target.com/blog-2/ you can probably ask somebody in your club for help.

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