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LED is not blinking

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Jatinder singh

Fri Jun 19 2009, 12:07PM

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Hello to all,
I am beginner, i am using AT89c51 MCU. I was program the following program. Checked all the connection which i was found in the same forum (www.8051projects.net/forum-t10422.html), but LED did not blink. Program was compile with no error in SIDE51 sotware(demo) also used as making HEX file. Plz help me

#include <Atmel\AT89C51-AT89LV51.h>
void delay()
{ int i;
for(i=0;i<15000;i++)
}
void main(void)
{ while(1)
{ P1=0;
delay();
P1=1;
delay();
}
}

Jatinder singh

Fri Jun 19 2009, 01:15PM

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These are the connections

ExperimenterUK

Fri Jun 19 2009, 02:48PM

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You may have to set port1 pins as outputs.
Look at samples of initializing code, that set pins on ports as outputs.

rearthur2003

Sun Jun 21 2009, 02:39AM

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Jatinder singh wrote ...

check the code i dont know of the software you are using but from the code i can say you have not define the port as output or input and try to specsify which bit to blink P1 is for the whole of port1

shyam

Sun Jun 21 2009, 05:59AM

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the compiler you are using is neither keil or sdcc compatible.
it is from SPJ systems (pune).

please use an example folder to check the hardware. u will find an led blink project in the SIDE-51 CD.

lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........

Jatinder singh

Sun Jun 21 2009, 09:33AM

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Thanks, Now it is working.But second problem is happened , I am using universal adoptor(1.5V, 3V, 4.5V, 6V, 7.5, 9V) for power supply.When i switch on the power supply, LED does not blink(LED in continusely on). When i three four times on off on off the switch
LED start blinking. This happen always in same pattern. I am using Cap.10 uf 50V instead of Cap. 10 uf 25v.Where is the problem i cannot found.

[ Edited Sun Jun 21 2009, 09:48AM ]

ExperimenterUK

Sun Jun 21 2009, 11:08AM

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You need a properly regulated supply.

Typically you feed the fairly crude output of your universal adapter into a
regulator such as a LM7805.

There are a few points to consider when making even a simple supply so it is
best that you do some research before trying again.

Jatinder singh

Sun Jun 21 2009, 12:12PM

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Thanks ExperimenterUK, I will try and tell you the results.

Jatinder singh

Thu Jun 25 2009, 12:01PM

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Hello ExperimenterUK/Shyam Sir,
Plz guide me where i am wrong.My program does not compile.

[ Edited Thu Jun 25 2009, 12:02PM ]

ExperimenterUK

Thu Jun 25 2009, 03:22PM

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Is this example straight off the disc or have you changed something ?.

I'd guess it doesn't like
"sfr P1 = 0x90"

Have a look for similar declarations in example programs and copy them.