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Case #96: Nick Has an Illuminating Flashback
DN Staff
January 8, 2007
3 Min Read
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
"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 |
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