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The Raspberry Pi camera is a wonderful; video and still images are high quality and the functionality of the camera can be controlled with shell commands or using the Picamera Python module.
However, I want to use the Pi camera in the garden or close to heavy machinery so I needed a longer and stronger cable with solid connections. The standard flat ribbon cable is fine for short distance but it is hard to find longer versions, and it is very fragile and hard to place in a design.
Searching the web I did not find anything usable for my applications. However a thread on the Raspberry Pi forum gave me the idea to try using an HDMI cable for extension. Surely an HDMI cable would be convenient, it can be purchased in local stores commonly with length up to five meters.
By comparing the diagram of the Pi Camera connector with an HDMI connector one can see that both have four data buses made by pairs of cables with a ground shield.
The design I made put the right cable at the right place to transform the flat ribbon into a round cable. There are four pins left since HDMI has 19 pins, these may become handy to use a few sensors close to the camera.
I have tested successfully simple 5 meter HDMI cables, cheap or expensive cables work the same. The video signal should not show any degradation until a certain distance (yet to be found). Passed the limit the video signal will be lost entirely.
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