In the photo above: On the firing line with the Arduino-based chronograph for potato velocity assessment. Arduino Uno and LCD control panel in the foreground
The Chronograph project was simply intended for fun. Having built a compressed-air potato cannon some time ago, I wanted to assess how well it performed- more specifically, how fast the potatoes exited the muzzle. While there are many affordable chronographs available on Ebay and elsewhere, the potato cannon posed some special issues:
- The potato is accompanied by a lot of gunk at the muzzle exit and most if not all chronographs would mis-read the high-velocity gunk as the intended projectile; a chronograph sensitive to only large objects was needed.
- Aiming accuracy for a potato cannon is incredibly poor. It is therefore dubious to consider placing the chronograph at a large distance from the muzzle because you will likely hit and destroy the chronograph within just a few shots.