Lpc2000

mahbub1833 wrote:

>Hi,
>I am newbie, working with phycore LPC2294. 
>
>For testing purpose I have connected 8 LEDs to the P0.0-p0.7. I have 
>applied right shifting algorithm. There the LED connected to P0.2 is 
>on but voltage is very low. Where all the LEDs are bright, there the 
>LED connected to P0.2 is dimming. I got nothing special with that port 
>in the datasheet. 
>
>Is there any problem in my board? Or anything special that I missed? 
>  
>

Probably giving us some parametric & specific information on:

* What is supply voltage on the "other" side of the LED (5v, 3.3v, 1.8v)?

* What is the typical Vf (Forward Voltage) of the LEDs?

* Are you using voltage dropping resistors in series with the LEDs?

* Are you pulling the LED cathode LOW to GND with the port pin(s), or 
driving the Anode HIGH?

* Are the LED diodes a commercial part (similar candella), or are they 
"grab bag" surplus LEDs?


Regards,

TomW


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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