thanks for your comments. While I was trying different staff to localise the problem, I realised that the problem is (probably) not in the cable connection scheme I follow, rather it is related to the BNC cable which I use to transfer the data from the camera. This BNC cable is connected to a video grabber which is connected to a laptop via USB cable. So even if the camera is connected (just with a DC cable), the mosfet works fine (i.e. turns on and off the camera). But when I connect the data cable to the video grabber, the mosfet conducts.
Now, I am not sure why this is happening and if it is related to the circuit. I can imagine that it might have to do with the hardware of the video grabber (Basetech BR116) since the problem appears without installing any drivers whatsoever. I simply plug-in the grabber and mosfet conducts. Is it possible that a small voltage flows back to the camera and makes the mosfet turn on?
Basetech Br116 Usb 2.0 Video Grabber Software Download
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Yesterday i used an usb hub, and powered the pi and the grabber from there, and also connected power to the pi ' usb connector.
There is where the things went wrong.
The pi works, but didn't see the grabber.
Then the leds stopped working, first strange patterns, then no reaction tot the colorwheel.
In the liveview of Hyperion the led effects were perfectly visible.
Looks like gpio 18 is dead....
I have tested the utvf grabber on my windows laptop, and it works, but, the picture format in VLC media player was very small.
And there it came to me, reduce the resolution to 355 by ??, Anyway very low.
That did the trick for me.
The pi zero can feed the grabber with enough power, try reduce the resolution.
yes i know this, some grabbers are really bad> for instance i have a grabber here that is recognized by the OS and gives you a videoimage, but the quality is really bad even when i set it to 1 [no decimation almost] picture is still horrible. 9af72c28ce
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