Two digit counter using pic16f72

[koolguy]

Hello,
I am working on another Project using Ultra Sonic sensor but the problem is that the crystal on zero PCB is not function i have changed to 20 to 4 MHz with code installation.
so, i need to find a way by designing a PCB which i required requarly pls suggest which software will be easy and fast with Gerber file..?

 

[Ian Rogers]

Eagle lite... Its the best "Free" software..

 

[koolguy]

what about dip trace?

 

[koolguy]

Hello Again,
I just watched this don't know which strip he is using and how ??
curious to know, how?

 

[Ian Rogers]

what about dip trace?

Why ask???

If you want to use dip trace, then go for it!!!

 

[koolguy]

No its fine just asking ...

 

[Ian Rogers]

I use Proteus, but as you know its a bit expensive..

 

[koolguy]

Hello,
Please suggest a cheap in cost, PIC micro controller with internal EEPROM for storing the digit after power.
As PIC16F72 can't do this and PIC16F877A is expensive thrice...!

 

[Ian Rogers]

How much is the picF72 in your country....

The PIC16F877A is outdated, this is why it costs soooo much.... I updated my systems to the newer PIC16F887

If you can get your hands on these newer chips you'll be better off.

 

[koolguy]

hi again,
This code is not working at all is there any fault or need debug??
pls have look...

#include <htc.h>

__CONFIG( BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS & CP_OFF );
#define _XTAL_FREQ 20000000


main(){
   
    TRISC=0;
    TRISB=0;
   
__delay_ms(300);
    while(1){
        PORTB=0XFF;
   
__delay_ms(500);
        PORTB=0Xff;
__delay_ms(500);

}
}

 

[koolguy]

How much is the picF72 in your country....

The PIC16F877A is outdated, this is why it costs soooo much.... I updated my systems to the newer PIC16F887

If you can get your hands on these newer chips you'll be better off.

Hi,
I buy from retailer at Rs 49/. per pcs PIC16F72
I mean PIC16F877 only..it is ~ Rs180/.

 

[Ian Rogers]

hi again,
This code is not working at all is there any fault or need debug??
pls have look...

#include <htc.h>

__CONFIG( BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS & CP_OFF );
#define _XTAL_FREQ 20000000


main(){
  
    TRISC=0;
    TRISB=0;
  
__delay_ms(300);
    while(1){
        PORTB=0XFF;
  
__delay_ms(500);
        PORTB=0Xff;
__delay_ms(500);

}
}

Seriously!!! Not being funny Ritesh, But a blind man could tell you what's wrong...... Hint... PORTB doesn't change much....

 

[koolguy]

Seriously!!! Not being funny Ritesh, But a blind man could tell you what's wrong...... Hint... PORT B doesn't change much....

Hi,
Yes but i have done that for testing but LED remain off then also, why?
And please suggest what to do for saving counter digit and why PIC163F877A is outdated.
**broken link removed**

 

[koolguy]

Helloo ,

I have solved the problem of EEPROM for saving data using PIC16F872...

 

[Ian Rogers]

Hi,
Yes but i have done that for testing but LED remain off then also, why?
And please suggest what to do for saving counter digit and why PIC163F877A is outdated.
**broken link removed**

You should post the circuit!!! I can't second guess.... The code is right, so maybe the hardware isn't...

 

[koolguy]

The hardware is as per Data sheet.
the Reset pin to Vcc with 4.7KOhm Pull up.
and the Vdd and Vss to +5V and GND. and OSC 1 and OSC2 to 20Mhz Crystal with 22pf connected to Gnd i use this circuit in all my Board in past.

 

[Ian Rogers]

The hardware is as per Data sheet.
the Reset pin to Vcc with 4.7KOhm Pull up.
and the Vdd and Vss to +5V and GND. and OSC 1 and OSC2 to 20Mhz Crystal with 22pf connected to Gnd i use this circuit in all my Board in past.

I appreciate that! However there must be something connected to the PORTB of the micro... LED's perhaps, or are you just using a multimeter!!

 

[Ian Rogers]

One other thing... The reason I say the chip is outdated.... The pic16f877a has been preceded with the newer pic16f887 and now we have the pic16f1719.. All pin compatible, but with loads more peripherals...

I used the pic18f452... They upgraded to the pic18f4520... now I use the pic18f45k20.. Progression..
Today's prices for 1 off
pic16f877a £3.89
pic16f887 £1.73
pic16f1719 £1.50 .... This does everything the last two do + more

pic18f452 £4.74
pic18f4520 £3.27
pic18f54k20 £1.89 .... This does everything the last two do + more

So why stay tethered..... The new pic16f1719 has two DAC's 8 bit and 5 bit...

 

[koolguy]

I appreciate that! However there must be something connected to the PORTB of the micro... LED's perhaps, or are you just using a multimeter!!

No, only RB7 with 1K Resistance and LED with GND.
anyway i have multimeter only is there any method to test crystal is working or not?

 

[koolguy]

hello,
I Have doubt when i use 877A with this setting it work fine.
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);

but this create problem in led blink why??
__CONFIG( BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS & CP_OFF );