26. 10 2009 11:41
DIY Camera Laser Break Beam Trigger MK 2
A DIY optical camera flash or camera trigger using a laser and PIC Processor based timer circuit.
Following from the basic high speed photography trigger we made, we found that it was difficult to be precise with the timing using the simple 556 timer based circuit.
We decided to try to make a new version using a PIC Processor and LCD display to display the timing settings.
The program was written in C and uses the ADC on the PIC as the input to take data direct from a photodiode and the processor deals with all the timing and delays before sending a pulse to a optical isolator to trigger a camera or flash unit.
The prototype build on a breadboard to allow easy development of the code.
Once the code was working we made a PCB
This was then fitted into a plastic box (from Maplin) and sockets were fitted for power, camera trigger, sensor and switches for changing the timing on the front and a toggle switch to allow changing the switching to switch from high to low.
The completed project.