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May 4, 2016 at 9:05 comment added Aron @Peepnbrick You can also look at any car 12V-USB adaptor amazon.com/gp/product/B00511PS3C/… These can normally be picked up for pretty cheap anywhere. Just solder the contacts to the light.
May 4, 2016 at 2:12 comment added Paul Dufresne The relay will not convert voltage to 5V. You still need a DC-DC converter or voltage regulator to get a 5V to pass through the relay. No point in having both a converter and a relay.
May 4, 2016 at 2:09 comment added Old_Fossil DC to DC converters use high frequency switching which generates RF noise between 300KHz up to 10 Mhz could affect both the operation of both the camera the the monitor as well some automotive systems. A simple relay is essentially an on/off switch triggered by the backup light. No interference whatsoever,
May 4, 2016 at 1:49 comment added Paul Dufresne Completely agree.
May 4, 2016 at 1:48 comment added user16540 @Paul Dufresne. Hopefully the DC-DC converter is the isolation type so common ground noise is not a problem. If not, the noise filter helps with that issue as well.
May 4, 2016 at 1:41 comment added Paul Dufresne Most of those sealed DC-DC converters, like the one in the link have a built-in inductor for noise reduction. I've used many of them, but Sparky is right on both counts. Use an existing ground point if one exists nearby. Since you will probably be wiring to the tail light, look for one near there.
May 4, 2016 at 1:36 comment added user16540 There should be at least one chassis ground wire or terminal by the rear tail lights. Use existing ground wires when possible. The turn-on burst of current will be no higher than the fuse/amp rating of your DC-DC converter. If the video is noisy just add a noise filter (2 amp 100uH to 1mH inductor) to your 5 volt line before the USB connector.
May 4, 2016 at 1:11 vote accept Chrøme
May 4, 2016 at 1:05 comment added Paul Dufresne Yes, black is ground and can to to any conductive surface.
May 4, 2016 at 1:04 comment added Chrøme Well, looks like I'm in luck: [link]ebay.com/itm/…. This converts directly to USB. Just to be certain, this converter has a red wire and a black wire. Obviously, the red wire connects to the reverse light wire, so does the black (presumably ground) wire just connect to a large conductive surface, or does that somehow get attached to the reverse light wire?
May 4, 2016 at 0:34 history answered Paul Dufresne CC BY-SA 3.0