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led problem... :(
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makrisd1:
Hello everybody!!!
I installed a pcb of leds on the dome like that:
http://img26.imageshack.us/my.php?image=4241836067osvetlenieintc.jpg
but i have a problem with this. :(
when i have the button (which opens the dome lights with the opening of door) pushed, and all of the doors are closed, the pcb of leds continue lighting but a little... but normally should be tottaly closed... The leds consume less current... can i do something to fix the problem?
Sorry for my english ;)
Udalec:
Look, it can to you the help.
http://www./index.php?section=handmade&item=equpment&article=nav_light
Udalec:
Excuse me.
http://www./index.php?section=handmade&item=equpment&article=nav_light
makrisd1:
--- Цитата: Udalec от Апрель 03, 2009, 07:51:44 am ---Excuse me.
http://www./index.php?section=handmade&item=equpment&article=nav_light
--- End quote ---
the link doesn't open :(
anton_sw:
--- Цитата: makrisd1 от Апрель 03, 2009, 01:31:04 am ---Hello everybody!!!
I installed a pcb of leds on the dome like that:
http://img26.imageshack.us/my.php?image=4241836067osvetlenieintc.jpg
but i have a problem with this. :(
when i have the button (which opens the dome lights with the opening of door) pushed, and all of the doors are closed, the pcb of leds continue lighting but a little... but normally should be tottaly closed... The leds consume less current... can i do something to fix the problem?
Sorry for my english ;)
--- End quote ---
Hi!
Usual lamp has approximately linear voltage-current characteristic.
And diode (led) has characteristic like this: http://en.wikipedia.org/wiki/File:Diode-IV-Curve.svg
If you doesn't need led "soft start/stop" you may add serially connected resistor. (calculation: Resistor[Ohm]=(12/LedOpeningCurrent)-LedResistance) This will reduce current in the circuit.
If you need led soft start/stop: it is not so simple to make led behave like usual lamp. But there are some solutions:
You should use for example microcontroller which will generate impuses like that:
My solution: you have lo learn some special materials about leds.
One of them: http://datasheets.maxim-ic.com/en/ds/MAX16832A-MAX16832C.pdf
Sorry for my english too :)
Regards, Anton.
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