Table of Contents
Camera Flash Control
| Cable | Shoe | Function? | Voltage | Wire |
|---|---|---|---|---|
| Shield | G | Gnd | 0 | |
| Red | F1 | Fire | 1.66Vdc | 3 |
| White | F2 | flash ready signal / data | 2 Hz signal 1-5V (0V when charging) | 2 |
| Black | F3 | TTL OK signal / clock | 1.06V (0V when charging) | 1 |
Measurements
| Flash Duration | |
|---|---|
| 0.1ms delay | |
| 27 to 28ms | one tube |
| 13ms | two tubes |
| 11ms | three tubes |
| 8ms | Four tubes |
Dimage A2
0.2-0.4ms pre-flash
120ms later, 0.64ms main flash
0.16 ms(1/16 power)
0.235ms (1/8 power)
0.43ms (1/4 power)
0.67ms (1/2 power)
4.25ms (full power)
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