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About papunblg

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Location:
Kolkata India
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Computer programming Electronics
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System Administrator Course Coordinator

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Rajsekhar Nag
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Knowledge Grows When Shared

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View papunblg's Blog

Recent Entries

Using 74HC595 to expand output pins of a PIC microcontroller: Assembly code

by papunblg on 14th April 2012 at 11:41
This is actually a continuation of my blog entry http://www.edaboard.com/entry1628.html where I have used C language routine. Now its the time to use Assembly Language for PIC. The Code is tested on PIC16F84A with 4MHz crystal. Compiler used MCS-51 under M-IDE Studio.

The associated program shows how to transfer a byte data serially to the 74HC595 and then sets the output accordingly.

According to page 5 of Datasheet, the outputs of 74HC595 provide 8 mA. Though I have

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How to expand I/O pins of a microcontroller using 74HC595 C Code

by papunblg on 14th April 2012 at 07:56
In this blog entry I will show you how to use a 74HC595 to expand I/O pins using only 3 I/O pins of a microcontroller. The program is tested on a 16F876A at 20MHz.

The associated program shows how to transfer a byte data serially to the 74HC595 and then sets the output accordingly.

According to page 5 of Datasheet, the outputs of 74HC595 provide 8 mA. Though I have used 330E resistors to drive LEDs , this should not be done! It is therefore recommended to connect

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Updated 14th April 2012 at 11:43 by papunblg

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Use of Vref+ pin of PIC16F87xA ADC [applicable to all micro]

by papunblg on 18th March 2012 at 06:11
The maximum analog voltage you can give to your PIC (directly, without any divider) is 5V. So whatever analog signal you are trying to measure, make sure that the i/p volt to that pin should not exceed beyond 5V. If you want to measure voltage more than 5V, you should use resistor voltage divider network. The values of resistances required depends on the range of input voltage. For 5V your micro will produce 1024.

What does Vref- do?

Suppose in your experiment, if you

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Updated 21st March 2012 at 19:56 by papunblg

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ADC Conversion Clock Select bit setting for PIC16F87XA, 18F2x2, 18F4x microcontroller

by papunblg on 17th March 2012 at 18:52
There is a fact to mention about the resolution of the A/D converter. Since the converter converts the signals, it takes a certain time. The conversion time of the low resolution A/D takes less time than the conversion time of the high resolution A/D. You have to consider carefully : if you select an analog to digital converter with high resolution – system will not be as fast; but if you select an analog to digital converter with high-speed response – you will loose the resolution of the system.

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Updated 19th March 2012 at 19:16 by papunblg

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Display temperature on LCD 16x2 display using LM35 and Pic16F876A

by papunblg on 4th March 2012 at 13:31
Code to display temperature on LCD 16x2 display using LM35 and Pic16F876A, 20MHz crystal

Code C - [expand]
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sbit LCD_RS at RC2_bit;
sbit LCD_EN at RC3_bit;
sbit LCD_D4 at RC7_bit;
sbit LCD_D5 at RC6_bit;
sbit LCD_D6 at RC5_bit;
sbit LCD_D7 at RC4_bit;
 
sbit LCD_RS_Direction at TRISC2_bit;
sbit LCD_EN_Direction at TRISC3_bit;
sbit LCD_D4_Direction at TRISC7_bit;
sbit LCD_D5_Direction at TRISC6_bit;
sbit LCD_D6_Direction

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Updated 14th April 2014 at 07:27 by papunblg

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