I have a new vehicle. It does not have one of those systems where you program your remote into it and can open and close your garage door. I must use a battery powered remote and keep it handy but out of sight. I'd like to power it directly from the car electrical system. One thought I had was to use 15 diodes (1N4007) and a 47Ω resistor to drop the voltage. That would drop my voltage to a range of 3.5 volts to 3.9 volts. The remote operates on a single 2032 coin battery, so it doesn't take much power.
Another thought I had was to use one of those cheap USB chargers you plug into a cigarette lighter. But it puts out 5 volts. The whole problem is that I'm cramped for space. The space is 8 cm deep x 7.2 cm wide x 3.5 cm high and tapers back to approximately 6 cm wide x 3 cm high. So whatever I do has to fit in that small space.
One thought I have is that using a USB adaptor along with my GDO remote, the coil on the adaptor might interfere with the radio transmission of the remote. All thoughts and opinions welcome. I know not what I am about to do.
I COULD mount the adaptor away from the remote, but then I'd have to find a place to stuff it under the dash. Not a difficult matter, but one I'd like to avoid. Maybe I should shield the adaptor from the remote. If so, with what? A sheet of copper (which I have). Should the shield be grounded? Lots of questions I don't have the answer to.
Another thought I had was to use one of those cheap USB chargers you plug into a cigarette lighter. But it puts out 5 volts. The whole problem is that I'm cramped for space. The space is 8 cm deep x 7.2 cm wide x 3.5 cm high and tapers back to approximately 6 cm wide x 3 cm high. So whatever I do has to fit in that small space.
One thought I have is that using a USB adaptor along with my GDO remote, the coil on the adaptor might interfere with the radio transmission of the remote. All thoughts and opinions welcome. I know not what I am about to do.
I COULD mount the adaptor away from the remote, but then I'd have to find a place to stuff it under the dash. Not a difficult matter, but one I'd like to avoid. Maybe I should shield the adaptor from the remote. If so, with what? A sheet of copper (which I have). Should the shield be grounded? Lots of questions I don't have the answer to.