This circuit is used to trigger a camera’s electronic shutter circuit when a flash of lightning is present. This circuit would also work for photographing fireworks displays or other events involving flashes of light.
It uses a photo-darlington sensor that looks through the viewfinder, and triggers the camera when the light is bright enough.
[Not my circuit, but was found at FC’s Electronic Circuits]
Ok, just starting out, but I’m going to make a shutter control as described here: “Super Mini Switch – A RS60-E3 Replacement”.
Parts I have so far:
From a broken Casio calculator:
2x Calculator Buttons (I’m trying to decide which ones, I’m thinking either C (red) or EXP (grey) for exposure, and ‘.’ (blue) for focus)
1x Rubber Layer with buttons to trigger touch sensor
From a broken CD Player:
1x 3.5mm Stereo Plug
From my cool junk pile:
1x Touch Sensor
From an old machine my dad got from work:
1x SPST Toggle Switch (Off/On)
From Dallas Semiconductor:
1x Plastic Box for shipping and storing ICs
It’s a shame what people throw away, really. I found the “Broken CD Player” smashed to pieces on the ground, ditto with the Casio calculator. Total cost so far: $0
Update: Stuff I got from the Dollar Store for the project:
Cell phone headset (for the 2.5mm plug) ($1)