I'm trying to get into HDR photography, which usually requires some very long exposure shots. The best way to do this is with a tripod and a shutter release. I got the tripod off Craigslist, but the shuuter release was too expensive for me, so I set off to make my own. This is inspired by this tutorial for a Canon DSLR
Step 1: Materials & tools
To keep this on the cheap, I kept it minimal. The most expensive item was the hands-free phone kit; on sale for $10. Check the comments. One was found at a dollar store. $1!
(1) Hands-free cell phone kit
IMPORTANT: The DSLRs take a 3/32" stereo plug. See the picture for details.
(2) Momentary buttons (two colors)
(1) Mini micro switch
(1) Enclosure, for me a wonderfully ironic 35mm film canister
Drill & bits
Soldering iron and solder
Wire stripping tools
Mad Skillz (which you have, because you're cool enough to find this)
Step 2: Break open the mic
Be destructive, but gentle
You may not get the same model kit, so some experimentation is required.
Inside the microphone box was a tiny circuit board hooked to 4 wires. I plugged in the kit to my camera for testing. Don't worry, there' s no current in these wires. I took my knife and shorted various combinations and observed the results. I found that two are ground wires, and the other two have functions:
By connecting the Red to a ground, the camera focused. Wonderful news.
We will now make button to do this work for us.
Step 3: Solder up the connections
Using the diagram below from Roger Cline
, Assemble and solder your buttons and switch. Test it often to avoid mistakes. When you're done, protect from short circuits with some tape.
Step 4: Make an enclosure
Here I used an empty 35mm film can from the girlfriend. I used the recycle symbol on the bottom to perfectly align my three controls and poked holes for drilling. Then using a similar bit to the one recommended on the button packaging, I drilled 3 holes.