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I downloaded the example hex file provided by sunrom to the AT89C51. It was a very simple example to blink the LED connected to any pin of port 2.

I designed the following circuit in Proteus ISIS and it ran successfully without any error with the attached HEX code. But when I designed the same circuit on the Breadboard then the same is not blinking the LED, instead it just turn on the LED. I cross checked all the connections and found that connections are correct. I downloaded the HEX file on another AT89C51 and tried.. again the same thing.

What is wrong, please help me. Can anyone try this at their end and PLEASE let me know where I am wrong!



]]> Sat, 28 Jun 2008 11:09:24 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html ledtest.zip]]> say2paul<say2paul@nospam.com> Sat, 28 Jun 2008 11:12:51 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html
Please Use This Circuit
]]> ۞ TPS ۞<tpsbpl@nospam.com> Sat, 28 Jun 2008 11:32:29 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html Is your xtal close to the micro's pins?

The code is ok.Try increasing the delay 2 or 3 folds.]]> sashijoseph<sashijoseph@nospam.com> Sat, 28 Jun 2008 11:47:53 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html ]]> ۞ TPS ۞<tpsbpl@nospam.com> Sat, 28 Jun 2008 12:00:03 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html
And TPS that a lot for the Breadboarg diagram ]]> say2paul<say2paul@nospam.com> Sat, 28 Jun 2008 12:04:10 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html
P.S. I noticed that the blinking of Led starts after 1-2 seconds I supply the power to the circuit, might be because of 10uF 63V capacitor.]]> say2paul<say2paul@nospam.com> Sun, 29 Jun 2008 08:16:12 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html ]]> Ajay<contact@nospam.com> Thu, 03 Jul 2008 23:31:26 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html say2paul<say2paul@nospam.com> Thu, 03 Jul 2008 22:32:29 -0700 http://www.8051projects.net/forum-t10422.html http://www.8051projects.net/forum-t10422.html say2paul<say2paul@nospam.com> Fri, 04 Jul 2008 02:04:49 -0700 http://www.8051projects.net/forum-t10422.html