Blinking led with a PIC

Sep 22, 2006 5 Replies

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lerameur 19 years ago

I am trying to make a led blink. I am using picbasic compiler. I get the program to work and the circuit to work, But it only blinks for a short amount of time, about 20 to 30 seconds. Even if I disconnect the power and replug it do not start again. The circuit is supplied with 5v If I disconnect the power for at least 10 min and then reconnect, then it will start again for about 20 sec.

Also, I download a program done in hex from :

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and it works fine

here is the code i use: which if found on google on many web sites using pic chip 16F88

loop: High 0 ' Turn on LED connected to PORTB.0 Pause 500 ' Delay for .5 seconds

Low 0 ' Turn off LED connected to PORTB.0 Pause 500 ' Delay for .5 seconds

Goto loop ' Go back to loop and blink LED forever End

ken

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lerameur 19 years ago

i am using a 12v battery (12.89v) with a LM7805 supplying to the circuit. so I am getting 5v. I have a chip that i loaded with a hex file I got on google, compile in jal

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but i used MicroC and picbasic pro to get my hex file, it blinks only a few times and then stops.

The chips are new, I tryed a few chips and they all do the same thing. excpet the one written in Jal which can blink forever

ken

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Jamie 19 years ago

i would say that your over heating it, or battery supply is dropping on you. or you have a bad PIC chip.

Real Programmers Do things like this. http://webpages.charter.net/jamie_5

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Bob Eld 19 years ago

Be sure to have a resistor in series with the LED to limit the current to

25mA. 120 or 150 ohms should work. You're probably overheating the device and it is shutting down after awhile then re-starts ok when cool. Bob

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lerameur 19 years ago

I found the problem, had to put a resistor to the MCLR port.. pffff unbelievable

ken

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Eeyore 19 years ago

This must be one reason I never use PICs.

Graham

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