| Electronics > Beginners |
| issues install flashing module a car 3rd brake light |
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| forrestc:
--- Quote from: wojtek077 on July 03, 2019, 07:40:38 am ---I think that's the problem goes down to 3v. I think module stays on and doesn't reset because of the 3v. Here's my video of my car https://youtu.be/Q9VJwAxUtEE --- End quote --- You mentioned adding a resistor, where did you add it? Was it in series or parallel? One of my experiences in switching from incandescent to LED's was that the cruise control thought that the brake was always depressed because the LED's weren't pulling enough current to drop the voltage on the brake line down close to zero when the brake pedal was let up. I think it was also in the 3v range. It was cured with a load resistor across the 3rd brake light. I just used the same 6ohm 50W one everyone else uses (and is widely available on amazon). In your case, you may need to add this between the flasher and the rest of the car, however I'd be a bit concerned if the car came with LED brake lights already that you may end up drawing more than the car is expecting from that line and cause a longer-term fault. Another option would be to add a couple of 1N4001 or similar silicon diodes in series to try to drop a bit of the voltage. Each one should drop around 1 Volt. However this might affect the brightness of the brake light depending on the driver circuit in the light itself. |
| wojtek077:
--- Quote ---You mentioned adding a resistor, where did you add it? Was it in series or parallel? --- End quote --- Yeah I added a 33ohms 1/2w resistor before the flasher and the led. --- Quote --- you may end up drawing more than the car is expecting from that line and cause a longer-term fault. --- End quote --- I seen on back of led light saying 0.8w at 13.5v but drowning only 0.6w at 13.7v with a flasher too. I think I'm still good. --- Quote ---Another option would be to add a couple of 1N4001 or similar silicon diodes in series to try to drop a bit of the voltage. Each one should drop around 1 Volt. However this might affect the brightness of the brake light depending on the driver circuit in the light itself. --- End quote --- I tried to add one 1n4001 but it same thing. I add them on positive side tho |
| james_s:
--- Quote from: wojtek077 on July 03, 2019, 08:07:19 am --- Uber and Lyft I hate to say but helped with drunk driving. DUI keeps getting more and more expansive which is a good thing. I got a feeling that cellphones the next new addition to the DUI. I was driving on the highway one night this girl going 70mph looking at her phone for good few seconds. My friend does road side assistance and his car's straight piped super load so he always goes next to car tell them to put phone down. He will speed up and slow down so kind he of forces them to put the phone down lol. --- End quote --- If I had a big ugly truck I'd be seriously tempted to pull a normally safe distance in front of them and brake aggressively. I'm not a fan of the typical approach to fighting drunk driving which is to just reduce the breath alcohol threshold that is considered drunk. I think that probably makes it worse, I mean if you're gonna get a DUI after one beer if you get caught anyway you might as well have a few more drinks, not gonna get in any more trouble. Instead I think they need to aggressively go after people who are heavily intoxicated and more so repeat offenders. A while back somebody around here drove right into the back of a DOT incident response truck that had flashing lights on, they were of course glued to their phone and didn't even look. Heck maybe if we stopped trying to make cars so safe it wouldn't encourage idiots to breed. |
| wojtek077:
Yeah I agree, I don't even want a beer if I'm driving. People drive piss drunk and don't care. I keep road to a min tho you never know what people can do. And also have dashcam just in case. |
| forrestc:
--- Quote from: wojtek077 on July 03, 2019, 06:01:30 pm --- I seen on back of led light saying 0.8w at 13.5v but drowning only 0.6w at 13.7v with a flasher too. I think I'm still good --- End quote --- My suggestion was to draw around 25W on the brake light circuit to force the voltage when off to drop to zero. i.e. put a 6ohm resistor in parallel with the entire thing. If the existing one is only drawing 1W this would be too much. You could also try a 3.3V zener backwards so that it adds 3.3V of drop. Edit/Addition: It also occured to me just after I posted this reply that there are circuits out there which will cut off below a certain voltage. Usually they're used to prevent overdischarging a rechargeable battery or prevent something from running at too low of a voltage. If you google 'low voltage cut off circuit' or 'low voltage disconnect circuit' you'll probably find a few. |
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