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These posts by sashijoseph have received thanks:

need urgent help please about burning the 8051
Also try with another micro,just in case the one you're using has a bad flash area.
Have you ever programmed successfully with the programmer?If no,then you may want to contact your vendor for a replac...
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Posted by sashijoseph on Wednesday 18 February 2009 - 20:02:57

Finger print attandence system
First look around locally for fingerprint sensors that are available.
Typically you would need a module with onboard authentication(relieving your microcontroller of the dirty work) and some kind of se...
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Posted by sashijoseph on Sunday 15 February 2009 - 23:04:50

How can I...?
use asm51 attached here for compiling.
in your code,remove all these declarations..
CODE:
ACC     EQU     E0h
                    B &...
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Posted by sashijoseph on Sunday 15 February 2009 - 03:10:38

Help on tachometer C code
You may use P3.7 in place of P1.1

The P1 of 89c2051 will be used for the lcd's data lines.

In the original code P0 is used in whole as a 8bit port,not as individual lines.That's why you don't see any b...
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Posted by sashijoseph on Sunday 08 February 2009 - 00:54:19

Need Help in Proteus
@pdi
there's a 'hidden pins' tab in the 'edit properties' page(right click on component) which allows you to connect the hidden pins to different nets.
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Posted by sashijoseph on Saturday 07 February 2009 - 20:27:13

Help on tachometer C code
CODE:
ena(){
P2_7 = 1;
delay (5);
P2_7 = 0;
}

ini_lcd(){
P1_1 = 0;        
P2_7 = 0; //transfering instructions
P2_6 = 0;
P0 = 56;  //function set
ena();
P0 = 56;  ...
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Posted by sashijoseph on Saturday 07 February 2009 - 05:32:01

p89v51rd2 and at89s51
You've omitted those diodes!!!
Well then most probably your micro's gone kaput.

The pc's serial port uses RS232 voltage levels which will destroy a ttl microcontroller if not for the MAX232 interface,...
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Posted by sashijoseph on Saturday 07 February 2009 - 05:01:06

digital code lock circuit
After 3 wrong tries the user password will get blocked and will be unblocked only by entering the master password.
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Posted by sashijoseph on Saturday 07 February 2009 - 04:10:14

caller id basics
Well you would need to buy a programmer for the microcontroller(89C2051).

But a better alternative would be to buy a P89V51RD2 micro(it's code compatible with 89c2051) and build a small circuit around ...
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Posted by sashijoseph on Saturday 31 January 2009 - 19:27:14

9541.98baud --> 9600baud..
Have you tested the atmel's serial connection with a pc or sth to verify that it's working ok?
See if you find a 11MHz xtal.That will solve your problem.
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Posted by sashijoseph on Saturday 24 January 2009 - 09:44:53

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