Yes, that photodetector looks a good one to me. You can connect several of them in parallel.
Also, do you think that the 20us
QuoteAlso, do you think that the 20us Think of it as 320 instruction cycles.
I was originally planning on using the continuous illumination method and hoping to capture an IR reflection off the bullet as it passes up to a foot above the photo diode. Do you think this would work? Also, do you think that the 20us or so the bullet reflects above the photo diode would be sufficient to trigger a digital pin on an Arduino?
The best way to trigger the Arduino is probably to use a rising or falling interrupt, that way it can response to very short pulses.
very interesting that all your chrono needed was to watch for a drop in light. I'm wondering how far above the sensors the bullet can be as still be detected.
Quotevery interesting that all your chrono needed was to watch for a drop in light. I'm wondering how far above the sensors the bullet can be as still be detected.The window is a triangle about a foot or 18" tall.I just visited the manufacturer's web site (not much hard data there), looks like some of their newer models include IR illuminators, so it's watching for a reflection rather than a shadow. The older passive models are still available.-j