So I have this Canon ELPH 300HS, I am using an arduino pro mini at 5v to trigger using the E38_APM script but with no luck. The camera sounds like it triggers and takes a shot but no picture is saved.
The pulse is 50ms high from arduino so I am not sure I would expect to measure the full 5V from my little meter. I measure a pulse of 3.6V
The "remote " setting had to be enabled from CHDK settings