Our ELT (enhance lightning trigger), mainboard can fire shots in Panasonic Lumix G1 GH1 Camera. (Thanks to our friend didi). Here is his message:
Lumix GX7 & GH4 are triggering !!! 🙂
I have soldered a cable with a female Cinch connector to the W and Y.
Center goes to W (focus), shield to Y (common GND).
Through an additional hole I bring the cable with the Cinch connector to the outside of the ELT.
I have also build an adapter cable with a male Cinch connector on the one side and a 4-pin Jack for the Lumixes on the other side.
This page eg explains the basic wiring: http://www.robotroom.com/Macro-Photography-2.html
The GND is directly connected to ELT’s Y (via shield of Cinch connector).
Between 3.1V and GND of the 4-pin Jack I put an 39k resistor.
Between the 3.1V of the 4-pin Jack and the center of the Cinch goes a 1.8k resistor.
I can use the ELT either on my Nikons or with the additional adaptor cable on my Lumixes.
Actually, the Nikons even trigger, when the Lumix adaptor cable is connected, so everything could be put in the box ..
Do not try to trigger both cameras at the same time. You would connect their electric circuits!
I dont’t think, that the Lumix would like the higher Voltage from the Nikon !!