Hi,Is there any possibility to enable the HDMI output in recording mode on a G7X?I would not need any HDMI stream, but just the +5V on Pin 19.Reason for that is that i want to use USB Remote using the +5V from HDMI Pin 19.Background: USB Remote is used in a Underwater housing together with reed contact(inside) and solenoid(outside). There is almost no space in the housing to place additional batteries.I had this setup already with my S100 + unterwater housing working. Now after changing to G7X it looks like the HDMI Transceiver is not enabled in recording mode (no +5V on Pin 19)
Quote from: hugoboss00 on 06 / June / 2018, 05:55:30Hi,Is there any possibility to enable the HDMI output in recording mode on a G7X?I would not need any HDMI stream, but just the +5V on Pin 19.Reason for that is that i want to use USB Remote using the +5V from HDMI Pin 19.Background: USB Remote is used in a Underwater housing together with reed contact(inside) and solenoid(outside). There is almost no space in the housing to place additional batteries.I had this setup already with my S100 + unterwater housing working. Now after changing to G7X it looks like the HDMI Transceiver is not enabled in recording mode (no +5V on Pin 19)That's a clever trick. Unfortunately, I'm not aware of any way to power up the HDMI port. If it's possible, reverse engineering would be required to find it.One possible alternative might be using the battery temperature ADC (see this thread for background https://chdk.setepontos.com/index.php?topic=10385.0). I'm imagining thin wire or flex cable taped to the battery, masking the thermistor pin, connecting to the switch through the external power port.The advantage of this is that the reed switch would just need to switch to ground or open circuit (or open circuit and the original terminal), not +5v.If this seems like it might work for you, I can come up with a build that supports remote via the battery terminal, just let me know which firmware you have.There might also be status bits related to the HDMI or SD video out that could be used. I'll have look at this a bit later.
There is an event procedure named ChangePowerState which is HDMI-related. Perhaps worth a try.
Thank you very much, also a nice possibility, but this has the disadvantage of having (thin) cables coming out of the camera and they have to be attached/removed for charging and normal usage (not underwater) of the camera.
Quote from: srsa_4c on 06 / June / 2018, 15:31:58There is an event procedure named ChangePowerState which is HDMI-related. Perhaps worth a try.It would be great if the transceiver could be powered using this function. How to call this function?