http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 20 Nov 2008 19:28:16 -0800 http://backend.userland.com/rss092 Today I got my first microcontroller programmer for 8051 from www.sunrom.com (1001-3456 v2)I downloaded the example hex file provided by sunrom to the <noauthor@nospam.com> http://www.8051projects.net/forum-t10422.html Please find attached the zip file containing the C and HEX code. ledtest.zip say2paul<say2paul@nospam.com> http://www.8051projects.net/forum-t10422.html you are not using pin no 9(RST) and 31 EA/VPP Connect it properly you will get the result best of luck Please Use This Circuit ۞ TPS ۞<tpsbpl@nospam.com> http://www.8051projects.net/forum-t10422.html Have you provided a proper power-on reset ckt?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> http://www.8051projects.net/forum-t10422.html ۞ TPS ۞<tpsbpl@nospam.com> http://www.8051projects.net/forum-t10422.html Thanks TPS and sashijoseph, I dont have the required capacitor for reset circuit right now. I will get it in the morning and will test the circuit and say2paul<say2paul@nospam.com> http://www.8051projects.net/forum-t10422.html Thanks its working fine now. The power on reset circuit really worked!P.S. I noticed that the blinking of Led starts after 1-2 seconds I supply the po say2paul<say2paul@nospam.com> http://www.8051projects.net/forum-t10422.html sure you can.. as you are working with 5V only Ajay<contact@nospam.com> http://www.8051projects.net/forum-t10422.html I will try it with 10uF 25V capacitor instead! say2paul<say2paul@nospam.com> http://www.8051projects.net/forum-t10422.html yes!! say2paul<say2paul@nospam.com> http://www.8051projects.net/forum-t10422.html