thinking of designing a chronograph

[seb]

I am thinking of designing a open sourcey type chronograph. The hardware and software seem to fairly simple, so I think I can make it work.

Some features I would like to include:

talk over usb (just enumerate as keyboard so data could be entered to an excel sheet or whatever) 

store (in non-volatile memory) at least 200 shots (planning to use attiny84 (512 bytes internal eeprom)) (the shots could be organized into shot strings)

change between m/s and ft/s





Does this sound interesting to anyone?

If so any other features you would want included?

has anyone else already done this and I just dont know about it?



thx for your help and feedback

 

[Grin_Reaver]

Sounds very interesting. Do walk us through the whole process with photos/videos. That way it will be fun for all of us.

 

[Guest]

Then, you can have the Chinese build it for you..

 

[Saltlake58]

I think the key is to make sure all the parts are readily available so the non-techie types like me can build it. Also, some method of calibration. If I mount the two sensors in a 2x4, there's got to be some method of accurately setting the distance so the computer can calculate the speed. Simplicity is the key.

 

[JungleShooter]

Check out the guy behind Airgun Shooting And Related Activities (his YouTube page).



He built at least two chronos.

Here's his latest production:

Begin of project: https://www.youtube.com/watch?v=yT9GsPgCp38

End of project: https://www.youtube.com/watch?v=3PMdk7mp3W4



His contact info (given in some of his vids):

Email: [email protected]
Country: Brazil (sometimes the writing is in English and in Spanish or Portugese)
Address: A.S. & R.A. Caixa Postal 19 Londrina - PR, Brazil CEP 86001-970

 

[idoc]

Would love to have something that works reliably in various lighting conditions. I have a heck of a time getting readings sometimes.