LEDs not glowing properly

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This topic has 4 replies, 5 voices, and was last updated 13 years, 5 months ago by Dexter.

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October 28, 2011 at 10:41 am #1355

Kigongo
Participant

When I connect LED to microcontroller 8051, they do not glow properly at the same time when connected to AVR o PIC they glow properly. Why is it so?

October 28, 2011 at 10:55 am #6753

sandeep
Participant

To which port have you connected Led? do give some details

November 2, 2011 at 10:17 am #6784

sourabh
Participant

Try using it in the negative logic.

November 4, 2011 at 9:54 am #6801

nikhiljain
Participant

Read this http://www.engineersgarage.com/microcontroller/8051projects/interface-leds-AT89C51-circuit

December 2, 2011 at 2:36 am #6895

Dexter
Participant

pull up resister is must for interfacing led directly to the ports

try with pullup resisters

use 10k resister

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