I am helping a friend with an experiment recording video and playing sound under water in a cage. This is controlled by an Arduino on a floating platform at the surface. The surface box also contains a battery and dvr.
Is there any other way of removing interference from video signal?
Once the noise is on the picture there is not much you can do. Best not let it get on in the first place.
However it does not look like noise to me. Noise is speckled, that looks like you have wiped out the sync pulses. It could be a power supply issue, look at the video signal on a scope.
You may have interferences from speaker wires,they act as transmitting antenna, water can increase the interferences ........
Try for speaker twisted pair cable or coax cable
Sync pulses
You don't need to change amplifier, you need locate the source of interferences.
Problem is the speaker belongs to university. It came pre-wired with 20 meters of two core flex. I don’t want to rewrite it with twisted pair or coaxial if I don’t have to.
I will put speaker in water tomorrow and start testing
Mike Ted, yous were rite, power supply. Tried separate battery for dvr and camera and picture stayed clear, even with sound on.
I tried powering dvr separately and camera separately with varying results, but the best result is dvr and camera on the same battery and Arduino and speaker on another battery.
So my question now is, how do I run this off the same battery? My setup is for a single 12v battery. Can I filter the power to the dvr/camera somehow, or make them think they are on a different battery?
Seedler:
12v to Arduino uno that it is regulating down to 5v itself.
12v relays. Powered by 12v but controlled by 5v Arduino signal.
12v to amplifier/speaker switched through relay
12v to camera and dvr switched through relay.
They are all running off a 12v 40Ah AGM battery.
Thanks.
Huge capacitor on amplifier power terminals 5000 - 10 000 uF
5V Voltage regulator for arduino, two 1000uF capacitors, input output.
Camera may work at 9V; 9V Voltage regulator and two capacitors as above.
Then you have seperated power supply for each device.
Seedler:
So is that a huge capacitor on 12v power input of amplifier? - The place where you connect wires from battery
Is the unos onboard 5v regulator not ok, and does it not have smoothing capacitors on input and output? - Arduino should be powered by 5V not 12V, voltage regulator on it is for creating 3.3V
Camera and dvr don't seem to want to work at 9v, so it will have to be 12v. What to I do here? - Dont touch for now and look what happens when you do capacitor and 5V regulator
Do I need to worry about the relay board? - Dont touch for now and look what happens when you do capacitor and 5V regulator