this topic sounds quite similar to me, because I'm searching help for nearly the same issue.
I also want to trigger a flash (old Metz flash macablitz 214 L 28 R - real old piece, but still working, about 210V). When the flash is loaded a small , let me call it lamp, located on the backside gets orange...
I try to trigger the flash with a digital I/O of the arduino uno board via a PhotoMOS AQW210EH - just the same way, it's shown on YoutTube.
The tricky thing is, that the flash doesn't want to trigger, only the orange lamp on the backside of the flash turns off and imediatly after the signal from arduino is switch off, gets on. This is the same behaviour I do get, when I connect the two leads from the loaded flash to an e.g. 220Ohms resistance - no flash, only the orange lamp goes off.
I'm quiet new to electronics - theoretical knowledge, but a practivcal rookie... The last few days I tried to find a understandable solution for this problem, but I could'nt find one... some suggest an opt-coppler, some a src, some this, some that... can anyone out there give me a clear giudance to this topic?
Thanks for all the efforts in advance
Link youttube video:
Link Datasheet AQW210EH: http://www.panasonic-electric-works.com/catalogues/downloads/photomos/ds_x615_en_aqw21eh.pdf