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Case #96: Nick Has an Illuminating Flashback
Design News Staff -- Design News, January 7, 2007
Photography enthusiast Nick Pagazani was hindered by the range and fixed location of his camera's flash. Since his camera has no connector for an external flash, he needed a light-activated slave trigger to fire a remote strobe. It had to ignore the pre-flashes used for red-eye correction and fire only on the main flash. His solution: Use a microcontroller to count pulses from a phototransistor and trigger the strobe at a switch-selectable count. Brighten up your shadowy background with this flashy accessory.
Download the build instructions | View Parts List | Post a Comment
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| "Slave Strobe" | ||
|---|---|---|
| Amt | Part Description | Allied Part # |
| 1 | PIC12F629 I/P microcontroller | 383-0287 |
| 2 | 0.1uF capacitor | 613-0513 |
| 2 | 1/4W 1 k Ohm resistor | 832-0537 |
| 1 | 1/4W 4.7 k Ohm resistor | 296-4769 |
| 3 | 1/4W 10 k Ohm resistor | 832-0530 |
| 1 | 1/4W 1 M Ohm resistor | 648-0204 |
| 1 | 2N2222 (or other) general-purpose transistor | 248-1004 |
| 2 | SPST toggle switch | 683-0085 |
| 1 | NTE5457 SCR (see schematic for alternate version) | 935-6236 |
| Additional parts required | ||
| 1 NTE3120 (or similar) Photo Transistor | ||
| 1 3V Lithium Battery and holder | ||
| Nuts and washers for the toggle switches | ||
| Kaiser Flash Shoe Adapter, available at www.bhphotovideo.com | ||
| Photoflash Strobe | ||
| PIC development kit & software to program the PIC: K8048 (kit), Vm111 (assembled), available at www.apogeekits.com — requires RS232 port and cable. USB versions are also available. | ||
Talkback
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Nick Pagazani's Strobe Trigger is a very useful device with the current crop of digital...
- 2007-26-4 02:20:44 EDT -
Cool project! but what about a pcb...
- 2007-11-1 04:14:59 EST -
What''''s wrong with txt?Was it really necessary to give the parts list as an excel file and...
- 2007-11-1 04:13:29 EST -
It probably was fun to use a microcontroller to count to 2, but a cmos flip-flop can do that...
- 2007-11-1 04:11:50 EST -
Nice job. I had a need for a device like this and found that Sunpak makes one almost like it....
- 2007-11-1 04:08:27 EST
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