I thought I'd share a few photos of my efforts to create an indoor lighting system for my prochrono digital.
I got the idea to use the hood posts as conductors from this video.
I bought a 5 meter strip of white led's from the Chinese mall at Hillfox for R160. I only used about 50 cm of that in total. The rest of the parts I had on hand.
I'm quite lazy about doing a proper write up, so hopefully the photo's will give you enough of an idea. Feel free to ask questions though.
At the far end you can see the wires going into the black lens/post housing. I drilled the holes for the wires to intersect the tubes that hold the posts. The wire is stripped and bunched up inside the tube to allow the post to make electrical contact with it when inserted.
The blue switch was added by me to enable independent switching of the lights. I also added a separate battery connector so the lights run off their own 9V battery. The prochrono pal and prochrono digital both have an extra compartment to allow for 2 9V batteries to be housed.
Apologies for the bad focus on this one. The orange wire was threaded though the hole from the back, stripped and bunched up then pressed back down into the hole so that when the post is inserted, it will press up against the exposed wire creating an electrical connection.
Well that's it. I'm sure the same thing can be done with the other brand chronographs.
My next planned project for this chronograph is to use the serial port on the chrony to Bluetooth-enable it so I can feed the data to my phone/laptop in real time.