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Camera Flash Control
| Cable | Shoe | Function? | Voltage |
|---|---|---|---|
| Shield | G | Gnd | |
| Red | F1 | Fire | 1.66Vdc |
| White | F2 | flash ready signal / data | 2 Hz signal 1-5V (0V when charging) |
| Black | F3 | TTL OK signal / clock | 1.06V (0V when charging) |
Measurements
Flash pulse: 27 to 28ms (one tube)
13ms (two tubes)
11ms (three tubes)
8ms (Four tubes)
0.1ms delay
Links
http://www.voitzsch.net/index.php/en/flashconv-a-minolta-flash-converter
According to sds.com the Control unit 80px has a thyristor and adjustable light output.
http://code.google.com/p/strobist-project-opensource-trigger/wiki/HardwareDocumentation
http://www.flickr.com/photos/fotoopa_hs/3715377259/ http://www.flickr.com/photos/fotoopa_hs/3709381751/
What to do next?
- Hook up a logic analyzer to the modulating signal
- Use a microcontroller to try grounding the TTL OK signal, or applying a few volts, after firing the flash.
- Open up the flash