Hi everyone, for those who are interested in a little afternoon project this is quite a nice one.
I was having a search on Google for DIY Air rifle... then Chrony popped up so i thought i'd have a look at this and found this
Poor Man's Electronic Chronograph - Yellow Airgun Forum Archive
Very simple to make and with a bit of practice in aiming down the chrony barrel the readings pop up on the screen like magic.
Only one modification i made - i did not use the 5V power supply from the PC with the resistor. I opted for the straight 1.5V AA battery, this was however not enough power so i added 2x1.5V batteries and it worked like a charm. The electronics store must have given me hgiher voltage IR emitters??? One other thing, the software can be a bit tricky... if it gives you problems and is looking for a missing .dll file go to this link to solve the problem. Also make sure that you make your chrony barrel at least 1 foot or 1 meter long, the software has those settings as minimum default. Pellet weight can be entered and if you are having trouble with the software not picking up the pellet, reduce the two volume entries for muzzle and impact to 10 (very sensitive)
SoftChrono??? Anyone mess around with it??
Attached a pic for you to have a look at. Would like to compare it to a actual chrony to see how accurate it is.