Hey guys/gals-
I'm new to the forum and hope you can help me on a project I'm working on.
I have a remote radar detector in my car, which has a little 5mm red LED that blinks whenever it's activated. The only problem is that the LED is small and inconspicuous, and doesn't really grab my attention when it needs to.
I have also been obsessed with the new "heads up display" (HUD) technology used one some of the newer cars- that displays an image flat on the dashboard that reflects off of the windshield, which gives the image a 'floating' appearance- really gets your attention! Usually used to display speed, etc.
Like this:
Well i want to create my own simple HUD system using the radar's LED, so i will see an image of the word "RADAR" floating in front of me whenever it's activated.
Like this:
I would create a small, maybe 2" x 3" x .5" panel that would be illuminated by 20 or so red LED's (ran in parallel or series) covered with a clear transparency with the word "RADAR" spelled out, that would be placed on the top of the dashboard. The light from the LEDs would only appear through the letters.
Like this:
So i made the unit. I used twenty (20) 5mm red waterclear LED's which each require 1.9-2.1V and <20mA of current.
Now came the trouble of making it work off of the single LED coming from the radar detector.
I figured the single LED from the detector was being given 2V or so. So i first wired my HUD unit with all 20 LED's in parallel.
I removed the red LED from the detector and had the two (+ and -) wires in my hand. I wired them appropriately to the new unit i had made, but the LED's did not light up. I checked again at nighttime, and noticed the LED's only lit up ever so slightly. I guess the current to the single LED is very low, not enough to illuminate 20 LED's.
So it was clear, i was out of luck! I simply cannot illuminate 20 LED's from a single LED's voltage and current.
So now i am on the chase to figure out how i can get these 20 LED's to illuminate from a 2V low current source.
Since then, i have removed the 20 LED's from being in parallel and now wired them in series. Every 5 LED's (4 sets) are wired in series with a 180-ohm resistor. So now i have two wires coming from the unit, that require 12V input. I figure this is the only way i can get them to illuminate correctly.
So now i need to figure out how i can turn a 2V low current input into 12V with pretty good current.
My first thought was using a relay. But it seems theres no such thing as a relay that's activated on 2v.
I did some research on this site, and found this thread:
http://forum.allaboutcircuits.com/showthread.php?t=3181
But i am very confused. I'm afraid i don't know much about using transistors or anything, and I dont understand what to do.
Can anyone offer any advice as to what to do? Can someone make a simple schematic for me so I can build a device that might work?
Thanks!
I'm new to the forum and hope you can help me on a project I'm working on.
I have a remote radar detector in my car, which has a little 5mm red LED that blinks whenever it's activated. The only problem is that the LED is small and inconspicuous, and doesn't really grab my attention when it needs to.
I have also been obsessed with the new "heads up display" (HUD) technology used one some of the newer cars- that displays an image flat on the dashboard that reflects off of the windshield, which gives the image a 'floating' appearance- really gets your attention! Usually used to display speed, etc.
Like this:
Well i want to create my own simple HUD system using the radar's LED, so i will see an image of the word "RADAR" floating in front of me whenever it's activated.
Like this:
I would create a small, maybe 2" x 3" x .5" panel that would be illuminated by 20 or so red LED's (ran in parallel or series) covered with a clear transparency with the word "RADAR" spelled out, that would be placed on the top of the dashboard. The light from the LEDs would only appear through the letters.
Like this:
So i made the unit. I used twenty (20) 5mm red waterclear LED's which each require 1.9-2.1V and <20mA of current.
Now came the trouble of making it work off of the single LED coming from the radar detector.
I figured the single LED from the detector was being given 2V or so. So i first wired my HUD unit with all 20 LED's in parallel.
I removed the red LED from the detector and had the two (+ and -) wires in my hand. I wired them appropriately to the new unit i had made, but the LED's did not light up. I checked again at nighttime, and noticed the LED's only lit up ever so slightly. I guess the current to the single LED is very low, not enough to illuminate 20 LED's.
So it was clear, i was out of luck! I simply cannot illuminate 20 LED's from a single LED's voltage and current.
So now i am on the chase to figure out how i can get these 20 LED's to illuminate from a 2V low current source.
Since then, i have removed the 20 LED's from being in parallel and now wired them in series. Every 5 LED's (4 sets) are wired in series with a 180-ohm resistor. So now i have two wires coming from the unit, that require 12V input. I figure this is the only way i can get them to illuminate correctly.
So now i need to figure out how i can turn a 2V low current input into 12V with pretty good current.
My first thought was using a relay. But it seems theres no such thing as a relay that's activated on 2v.
I did some research on this site, and found this thread:
http://forum.allaboutcircuits.com/showthread.php?t=3181
But i am very confused. I'm afraid i don't know much about using transistors or anything, and I dont understand what to do.
Can anyone offer any advice as to what to do? Can someone make a simple schematic for me so I can build a device that might work?
Thanks!