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USB Media
Management
PWM
Triggering
The Survey3 camera can receive and act on a couple PWM values
when sending a PWM pulse using the optional HDMI PWM trigger
cable. Please see the below PWM levels for more details.
The 1000us neutral value is the default value the camera is always
expecting and will not do anything at that pulse width.
To capture a photo, send the camera a momentary 2000us pulse.
To enter media transfer mode, send the camera a momentary 1500us
pulse. To exit send a 1500us pulse again.
Survey3 allows you to power on and charge the camera by
connecting one end of the USB cable to the USB/FPV port and the
other end to your computer.
The microSD card in the camera stores the captured media and
typically must be removed and inserted into a computer in order to
browse the saved media content. With Survey3 though you have the
option to also send the camera a 1500us PWM signal to put the
camera into media transfer mode, making media browsing easier.
Media transfer mode allows the computer that is connected to the
camera to then mount the camera’s microSD card and the captured
media will show up as a removable disk on the computer. This allows
you to browse the contents as well as perform some remote
automation.
One common application for media transfer mode is to connect the
camera to a companion computer such as a Raspberry Pi on your
robot (UAS/drone) and then move the camera’s media to the
computers own storage media. This allows the content to more easily
be removed from your robot if the Survey3 cameras are too difficult
to access. You could also perform some processing on the media.
Enabling Media Transfer Mode:
Send the camera a 1500us PWM
pulse using the optional HDMI PWM trigger cable.
Disabling Media Transfer Mode:
Send the camera a 1500us PWM
pulse when it is already in media transfer mode.
