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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
As a side project, I am building a set of Roof and Deck amber lights... the current design has flash patterns controlled by an Arduino, the LEDs (which I get in strings of clusters of Three each designed for 12VDC) are driven via TIP101 Transistors (which allows a full On state and a "half" on state (so one set of adjoining LEDs can appear brighter than the other)... right now I have one of the Window Units flashing two squares of nine LEDs (three clusters on each string)
schematic will be posted shortly, but it is like this: a 12V battery (or the car cigarette outlet) powers the entire setup, and the Arduino uses it's regulator to power itself while a full 12V goes to the LEDs (or a little more since they are pulsed)... the base of each TIP101 is connected to an Arduino PWM Digital Out... the collectors go to 12V+, and the emitters go to the LEDs and also through a Diode to the Arduino (This prevents the common ground the Arduino has from making the emitter current on one transistor flow the the LEDs of the other transistor via the common ground)
currently, since I could not find my box of Diodes, I used some UV LEDs I had lying around (the ones from RadioShack)
Pics will be up sshortly, I have to sort out issues with my normal camera filming this, but I might use my High Speed camera and put it to YouTube in Slow Motion so that the flash patterns and brightness differences are clear...
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
aonomus wrote ...
Please tell me you aren't a whacker...
This better be epically hamsexy.
Also, why not just use 555+4017 to get blinking patterns?
I planned to use an Arduino because it would allow me to program several different patterns, and have one circuit to control all of the lights sets (front, rear, roof lights... and possibly strobes in the headlights, but I have to look into legality of the strobe headlights first)
ham radio-assisted events are part of the reason for the build, but main reason is that a lot of my more serious projects, which can pose a hazard, are on some private roads that my family's farm has, which are shared by other people... I operate a lot of these things (like rockets and fireworks for example) remotely from my car, and the car is close enough that I figured the lights would be good enough for hazard signaling... I know most cars come with "hazard" lights, but honestly... do most people driving by think of those as more than a stalled car or parked indicator
ADDITION: also, I forgot to add this, the lights are not a permanent installation, they are put on and taken off as needed...
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Homemade Amber LightBar and Deck Lights...
