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Slave Flash Trigger

A Programmable Optical Slave Flash Trigger
for Digital Cameras with Processor PIC 12F675

Slave Flash Trigger circuit diagram (9KB)

The synchronizer ensures a contact-free, optical synchronization of external photographic flashguns. The triggering of the external flash is derived from embedded flashes of a camera. It can be used for both digital and "analogous" cameras or for a remote synchronization of the actual flash units. Its use is optimal especially with digital cameras (DC), where extraordinary adaptability for different systems will stand out. It is capable of eliminating the effect of any measuring pre-flashes. The synchronizer thus perfectly fulfils the role of a device often called the Slave Flash Trigger (SFT). Thanks to an optical coupling, it enables safely to use even the oldest flashguns that could otherwise damage DC by high voltage ignition. The Slave Flash Trigger enables to place the external flashgun in the close proximity of DC, but thanks to high sensitivity the flashgun can be even tens of metres away from the camera, if needed. Having such sensitivity, the device is remarkable with high resistance against the effects of ambient lighting and the interference by varying light sources. Also, the operation outside under sunshine does not make problems for it thanks to an adaptation algorithm. Not a negligible advantage is the possibility of its simple and safe application with cameras to which otherwise the external flashguns cannot be connected at all.


THIS SOFTWARE CAN FREELY BE USED ONLY FOR NON-COMMERCIAL PURPOSES. THE AUTHOR PROVIDES THIS SOFTWARE "AS IS", ABSOLUTELY WITHOUT ANY GUARANTEES, AND DOES NOT ASSUME ANY RESPONSIBILITY FOR ITS QUALITY, FUNCTIONALITY OR ANY DAMAGES INCURRED BY USING THIS SOFTWARE. TO CLAIM ANY COMPENSATION FOR DAMAGES FROM THE AUTHOR IS THEREFORE FULLY EXCLUDED.

The program is in the HEX INTEL format and includes a configuration word.
Slave Flash Trigger Software version FL6318 for processor PIC 12F675
Copyright by Pavel Janko


Do the download with the right-mouse button using the selection 'Save the target as...'

The Slave Flash Trigger in connection with the external flashgun helps solve the following problems:

Slave Flash Trigger unit (21KB) Slave Flash Trigger unit open (20KB)


The Slave Flash Trigger has three basic states:

1. Switched ON

The Slave Flash Trigger is switched on/off by pressing the push button. When switched on, one to three flickers of the indicator lamp signalizes the programmed mode. One flicker determines that the flash will be fired at each flash. Two flickers indicate that the flash is fired at the second flash. Three flickers mean that the external flash is fired not earlier than at the third flash. The indicator lamp, after the Slave Flash Trigger is switched on, does not glow permanently due to the maximum saving of power. Thus, the operating time of about 300 hours is achieved for one battery.

2. Switched OFF

The switch-off is signalled by the slow extinguishing of the indicator lamp. If the Slave Flash Trigger is not switched off by the push button manually, then it is switched off automatically in half an hour from the last captured flash.

3. Programming / Testing


Technical properties:

Warning!!!


Hints:

Slave Flash Trigger circuit option (3KB)

Other Digital Slave Flash Trigger link

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Apr. 2004
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