Step 1: Parts
-Film Canister: This will serve as the body for the controller, after all, it is going to be used for taking pictures!
-Two-Way Switch: I had an old electronics kit from RadioShack that I took it from.
- 2 Submini Pushbutton Momentary Contact Switches: Purchased at RadioShack for about 3 bucks. Only pieces I had to buy.
-3/32" Stereo Jack Plug: I'll discuss this in the next step.
-Three Identical Lengths of Copper Wire: However long you want the cord to be.
-Meter w/ Continuity Test: Will come in handy when making connections later.
And then, some basic parts:
-Utility Knife or Scissors
-Soldering Iron and Stand
-Rosin Core Solder
-Heat Shrink Tubing
-Drill with Small Bits (I used a 3/16" bit to drill holes for the pushbutton switches)
Step 2: Let's Start!
My graphing calculator came with this cable for connecting 2 calculators together, and I figured that I would probably never need to do that, so I cut it in half and stripped the three wires inside. Make sure that none of the wires are shorted due to a cut in the insulation! You'll ruin the whole thing.
Also, before continuing, plug this jack with the stripped wires into your camera and power it up. Experiment with shorting different wires to figure out which two you have to connect to make the camera focus (if it's on autofocus) and which two have to be shorted to take the picture. One wire should be common to both of these connections. Make a note of all this!
Step 3: Cutting & Drilling
Use the utility knife to (carefully) cut a rectangular hole the size of your two-way switch, so that the top plate can rest on top. A little too small is okay, a little too big is NOT!
Once you're done with that, drill a couple of holes for the pushbutton switches next to the hole you cut. My "submini" switches needed a 3/16" hole. Unscrew the nut from the switch, push the switch through the hole, then use a couple of pairs of pliers or vice-grips to tighten that nut back on. Then, add the sliding switch.
Step 4: Turning 3 Into 1
Step 5: Wiring It Together
Cut off one of the outermost leads of the two-way switch and insulate with a piece of head-shrink tubing. This will ensure that when the switch is slid in this direction, the remote will be "off" and the buttons will not function, preventing accidental triggering of the shutter. Wire one lead from each pushbutton switch to the other outermost lead of the two-way switch (opposite the one you just cut off). Solder one of each of the 3 twisted wires to each of the remaining contacts - one to each pushbutton and one to the center lead on two-way switch. Make sure to insulate everything!
I added a couple schematics-choose whichever you like better.
First Schematic: Switch(that thing in the middle of the drawing) up: buttons focus & take picture. Switch down: remote is off; button's don't have any effect.
Second Schematic: Switch(that thing in the middle of the drawing) up: butons focus & take picture. Switch down: Take picture until switch is slid back up (ideal for bulb exposures!!!).
I wired mine the first way, but I wish I had done the second. =/ Don't make the mistake I did!
Step 6: Making It Compatable With the Camera
Next, solder the wire from one pushbutton to the wire that activates the focus. The pushbutton you choose does not matter, I just chose the black one.
Finally, solder the remaining wire from the other pushbutton to the remaining wire from the jack. This will be the pushbutton that activates the shutter, so I chose to make it the red one. Then, to make it look pretty, heatshrink the whole mess together. Just don't forget to heatshrink the individual wires first so that they don't touch any other connections.
Step 7: Putting It All Together
Push the slack into the canister so that in case the twisted cable gets yanked, all your beautiful soldering work won't come apart. Put the cap on and plug the cable into the remote control port on the digital camera. Here's how to work it:
When the switch is "down" (in my case, towards the black pushbutton) the remote is off and will not do anything. When you're ready to take a picture, slide the switch "up" towards the other pushbutton (in my case, the red one). If the room is brightly lit and your subject is stationary, press the black (bottom) pushbutton and hold until the camera autofocuses. Release and push the red button to take the picture. In this use, the camera will focus when you push the black button and beep, then focus again quickly before taking the picture when the red button is pushed.
If the room isn't brightly lit, or your subject is moving, push the black pushbutton and hold until the camera focuses, then continue holding and press and release the red button to take the picture. In this use, the camera only focuses once, preventing possible blurry pictures from trying to focus quickly.
This can also be used for "bulb" exposures. Just set your camera's shutter speed to bulb, push and hold the black button, and continue holding while pushing and releasing the red button. The camera's shutter will remain open until you release the black button.
Oh, and remember to slide the switch back down when you don't want to take a picture.
That's it! A quick and easy remote control that I had all the parts for, except the pushbuttons, so it only cost me about 3 bucks. Enjoy!