Hello guys
For the past few weeks I've been working on a little ambilight-like project (in vein of http://divxstation.com/article.asp?aId=151, but with a different microcontroller setup, and some other minor changes), and so far, everything software-wise have been going pretty smoothly.
My only real problem lies with the transistores turning on and off the RGB-leds, which I can't seem to get working -I've tried calculating the needed resistor sizes through some measurements, but it still didn't give enough amperes for the LEDs.
I'm working with two kinds of RGB LEDs (http://www.dotlight.de/shop/product_info.php/cPath/263_264/products_id/744 and http://www.dotlight.de/shop/product_info.php/cPath/263_264/products_id/340), one having one anode and three cathodes, and the other having one cathode and three anodes, and therefore two different transistors - BC557NPN and BC547PNP.
If I could get some help getting just one of the posted schematics working I would be very grateful - it's the sizes of R2 to R7 I need help with.
Datasheets can be found at:
http://www.dotlight.de/datasheets/LL-U48RGB3C-001.pdf
http://www.dotlight.de/datasheets/SRGB7130.pdf
http://www.datasheetcatalog.org/datasheet/mcc/BC556B.pdf
http://www.datasheetcatalog.org/datasheet/mcc/548B.pdf
Edit: I only have those two transistors available, so recommending another transistor will not be helpful, unless there's no chance of getting them to work.
For the past few weeks I've been working on a little ambilight-like project (in vein of http://divxstation.com/article.asp?aId=151, but with a different microcontroller setup, and some other minor changes), and so far, everything software-wise have been going pretty smoothly.
My only real problem lies with the transistores turning on and off the RGB-leds, which I can't seem to get working -I've tried calculating the needed resistor sizes through some measurements, but it still didn't give enough amperes for the LEDs.
I'm working with two kinds of RGB LEDs (http://www.dotlight.de/shop/product_info.php/cPath/263_264/products_id/744 and http://www.dotlight.de/shop/product_info.php/cPath/263_264/products_id/340), one having one anode and three cathodes, and the other having one cathode and three anodes, and therefore two different transistors - BC557NPN and BC547PNP.
If I could get some help getting just one of the posted schematics working I would be very grateful - it's the sizes of R2 to R7 I need help with.
Datasheets can be found at:
http://www.dotlight.de/datasheets/LL-U48RGB3C-001.pdf
http://www.dotlight.de/datasheets/SRGB7130.pdf
http://www.datasheetcatalog.org/datasheet/mcc/BC556B.pdf
http://www.datasheetcatalog.org/datasheet/mcc/548B.pdf
Edit: I only have those two transistors available, so recommending another transistor will not be helpful, unless there's no chance of getting them to work.
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