1/27/2014 The First 8051 Microcontroller Project – LED Blinking | Mohammad

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September 2008August 2008

The First 8051 Microcontroller Project – LED Blinking

Posted by Mohammad On August - 20 - 2008 19 COMMENTS

The first “Hello World!” project I prefer for Microcontroller is LED Blinking. I have used ATMEL’s 89C51(40-pins DIP) 8051 architecture microcontroller which is ideal for first time learning MCU Chip. I used my

previously made 5V Regulator to supply uninterrupted regulated DC voltage. The program is very simple andstraight forward, that uses a delay procedure that loops for 255 x 256 = 65536 times and produce loop based

software delay.

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org 0000hloop: mov b, #0FFh acall delay clr p1.0 mov b, #0FFh acall delay mov p1, #0FFh

ajmp loop

delay: djnz acc, delay mov acc, #0FFh djnz b, delay

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Rating: +7 (from 7 votes)

Rating: +2 (from 2 votes)

retend

Rating: 8.6/10 (20 votes cast)

The First 8051 Microcontroller Project – LED Blinking, 8.6 out of 10 based on 20 ratingsUncategorized

Mohammad

19 Responses

1. athar says:

February 6, 1928 at 4:26 pm

goood project for learning

Rating: 5.0/5 (1 vote cast)

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2. anshuman says:

February 22, 1928 at 9:45 pm

how do you connect the microcontroller with the pc.

Rating: 5.0/5 (3 votes cast)

3. tyler says:

December 24, 2008 at 4:17 am

hi.i interest about MCS-51.Your project LED Blinking by 8051 it very easy.

Thank you for example.maybe u have free time.Thank You.

Rating: 0.0/5 (0 votes cast)

4. Binu says:

May 27, 2009 at 10:54 pm

Good start!

Rating: 5.0/5 (1 vote cast)

5. deena says:

September 5, 2009 at 7:25 am

goooooooooddd..

Rating: 0.0/5 (0 votes cast)

6. nasir says:

1/27/2014 The First 8051 Microcontroller Project – LED Blinking | Mohammad

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Rating: +2 (from 2 votes)

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September 9, 2009 at 10:38 pm

do you have an example to blinking 7 led sir?i need a circuit and the source code also..

perhaps the source code is using keil uversion and 8051 microcontroller..

Rating: 0.0/5 (0 votes cast)

7. Doru says:January 15, 2010 at 7:21 am

Hi there. I have a simple project for school. I need to connect a 8051 to a 7 segment lcd and to make a

counter. Basically once every 2 seconds the display should increment with i(where i is a value that can beset from the assembly code). When it reaches 10 it should overflow and start over.

I need to simulate this in proteus.

Please help me. I will be forever grateful.

Rating: 0.0/5 (0 votes cast)

8. Prithviraj says:

May 12, 2010 at 1:46 pm

But how do you program the 8051? serial or ISP?? please give the programming circuit sir…..thank

you…..

Rating: 2.7/5 (3 votes cast)

9. Sajiv says:

July 6, 2010 at 6:54 am

Good for beginners.

Rating: 4.0/5 (1 vote cast)

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10. gaurav singh says:

July 10, 2011 at 2:13 pm

sir

is this possilbe to connect led + terminal to the mcu and – to the gnd

will the mcu draw enough couurent to blink the led

Rating: 0.0/5 (0 votes cast)

11. rashmi chauhan says:

July 10, 2011 at 2:17 pm

HI Sajiv

this is good for beginers ,good job

check out this blog for 8051 usb programmer schematic

http://microembeded.blogspot.com/2011/06/usb-8051-avr-microcontroller-programmer.html

Rating: 0.0/5 (0 votes cast)

12. Mohammad says:

July 10, 2011 at 8:06 pm

@Gaurav Singh: You can do it too, but add a current limiting resistor in series to make sure the current

through the LED doesn’t go above 25-30mA.

Rating: 0.0/5 (0 votes cast)

13. Daljit says:

November 1, 2011 at 11:13 am

sir please tell me why led is blinking on clear and off when set…???why??plz answer me m so confused

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14. Mohammad says:November 2, 2011 at 12:56 am

@Daljit: Simple math. Do you see the right side (+) of the LED is connected to VCC (+5V)? Now if you

ground (0V) the other side, LED will lit.

Rating: 0.0/5 (0 votes cast)

15. mayur says:

March 13, 2012 at 7:42 am

sir, for lighting on any building or temple, can we use such kind of program(more complex)

Rating: 0.0/5 (0 votes cast)

16. vikram says:

June 10, 2012 at 3:38 am

better for fresher’s

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17. pushkar says:July 13, 2012 at 6:22 am

gooood start……

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18. manoj soorya says:

January 31, 2013 at 8:00 am

can you tell how to build a switched off delay circuit with 89C51?

Rating: 0.0/5 (0 votes cast)

19. melaku says:

March 30, 2013 at 6:21 am

Hi there. I have a simple project for school. I need to connect a 8051 to a 7 segment lcd and to make a

counter. Basically once every 1,1/2,2 seconds the display should increment with i(where i is a value that

can be set from the assembly code).

Rating: 0.0/5 (0 votes cast)

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