Thursday, 25 April 2013

Chronograph - Part 6

Working on this project has really got me thinking and now I have my air rifle I needed to get something finished and usable ASAP before I started to tune the rifle, I don't want to go over the legal limit.

Whilst thinking about the total cost of the parts to make a usable chronograph, the one most people buy is £50, I had the idea of removing the LCD and just using the serial link to the PC.

So I thought about strapping an Arduino Nano to an aluminium tube with a 1/2" UNF thread so that it would fit on the standard silencer adapter, this would make it very stable.
I decided to use the Nano because there wouldn't be the need for a battery to power it, the USB lead would carry power and data back to the PC, people would also be able to programme them without having to buy the serial/USB interface.

Marking out the sensor distance
Tube screwed into the silencer adapter for my rifle
Fully assembled prototype with a foam spacer
Finished part attached to the Air Rifle
I used some thin but very tough heat shrink sleeving the same as that used to hold battery packs together on remote control cars



Below is a screen grab of the PC software (Ignore the FPS value, I'd forgot to change the calculation to 60mm spacing instead of 100mm)
Now for some more testing.


2 comments:

ITBox said...

Nice work.
This program did you do it yourself?
Do you have link to the program and sketh for arduino?

Gadjet said...

ITBox,
Thanks.
Yes.
You can find a sketch here http://gadjetsblog.blogspot.co.uk/2013/05/chronograph-update.html

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