Pulse Counter - Electronic Circuits Projects Diagrams Free

EDSON · 8th May 2008, 06:38 PM

I need to build a pulse counter with a PIC,employing TIMER0, with the following characteristics :

1) a square wave (0V - 4.7V) amplitude is applied to a unique pin of the PIC (say A4);

2) its frequency varies between 100Hz and 1kHz, (100,200,300,400,...900,1000);

3) the output is given in binary with leds (8 bits) and remains in the configuration during the application of the signal;

4) when the signal is switched off, the leds of the configuration become off;

gramo · 9th May 2008, 11:00 AM

Do you need to employ TMR0? This can be easily done by incrementing registers

eg,

Code:

Repeat
Until PORT.Pin = 0

Repeat
Until PORT.Pin = 1

Repeat
   Inc(Result)
Until PORT.Pin = 0

and of course from there you can add a timeout with something like

Code:


Result = 0
Repeat
   Inc(Result)
Until PORT.Pin = 0 or Result = 0

Result = 0

Repeat
   Inc(Result)
Until PORT.Pin = 0 or Result = 1

Result = 0

Repeat
   Inc(Result)
Until PORT.Pin = 0 or Result = 0

From there you can figure out what the modifier required would be from the code overhead by simulating and scale the Result up to uS or mS as required to find the frequency of the signal

Gayan Soyza · 9th May 2008, 11:14 AM

Ya 100 to 250 of course ok & when the pulse increase you need to do some multiplication routine (8bit mul) will be fine.Aaaah you are displaying it on 8 LEDs.

I use TMR0 as counter & feeding pulse to RA4 something like that & reads the TMR0 value on certain period of time & do all other calculations.

But for example if the frequency is 300Hz how do you show them from 8 LED's?

EDSON · 10th May 2008, 12:39 PM

Thanks Very Much For Your Reply.

Best Regards.

Edson

EDSON · Yesterday, 02:03 PM

Thanks for your reply. I would appreciate if you could give-me the source code (in MikroC or CCS C) for a pulse counter with the TIMER0, counting frequencies from, say, 10Hz up to 200Hz, with ranges of 10Hz (10,20,30,.....200) with bynary outputs in 8 leds.
Best regards and thanks for cortesy.
EDSON

blueroomelectronics · Yesterday, 03:19 PM

Quote:

Originally Posted by EDSON

Thanks for your reply. I would appreciate if you could give-me the source code (in MikroC or CCS C) for a pulse counter with the TIMER0, counting frequencies from, say, 10Hz up to 200Hz, with ranges of 10Hz (10,20,30,.....200) with bynary outputs in 8 leds.
Best regards and thanks for cortesy.
EDSON

How much code have you written?

gramo · Today, 06:20 AM

Quote:

Originally Posted by EDSON

Thanks for your reply. I would appreciate if you could give-me the source code (in MikroC or CCS C) for a pulse counter with the TIMER0, counting frequencies from, say, 10Hz up to 200Hz, with ranges of 10Hz (10,20,30,.....200) with bynary outputs in 8 leds.
Best regards and thanks for cortesy.
EDSON

I don't do C

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8th May 2008, 06:38 PM
EDSON New Member	Pulse Counter I need to build a pulse counter with a PIC,employing TIMER0, with the following characteristics : 1) a square wave (0V - 4.7V) amplitude is applied to a unique pin of the PIC (say A4); 2) its frequency varies between 100Hz and 1kHz, (100,200,300,400,...900,1000); 3) the output is given in binary with leds (8 bits) and remains in the configuration during the application of the signal; 4) when the signal is switched off, the leds of the configuration become off;

9th May 2008, 11:00 AM
gramo Experienced Member	Do you need to employ TMR0? This can be easily done by incrementing registers eg, Code: Repeat Until PORT.Pin = 0 Repeat Until PORT.Pin = 1 Repeat Inc(Result) Until PORT.Pin = 0 and of course from there you can add a timeout with something like Code: Result = 0 Repeat Inc(Result) Until PORT.Pin = 0 or Result = 0 Result = 0 Repeat Inc(Result) Until PORT.Pin = 0 or Result = 1 Result = 0 Repeat Inc(Result) Until PORT.Pin = 0 or Result = 0 From there you can figure out what the modifier required would be from the code overhead by simulating and scale the Result up to uS or mS as required to find the frequency of the signal __________________ Spency. How many PC programs are developed with assembler? Then why use it with PIC's? PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net

9th May 2008, 11:14 AM
Gayan Soyza Experienced Member	Ya 100 to 250 of course ok & when the pulse increase you need to do some multiplication routine (8bit mul) will be fine.Aaaah you are displaying it on 8 LEDs. I use TMR0 as counter & feeding pulse to RA4 something like that & reads the TMR0 value on certain period of time & do all other calculations. But for example if the frequency is 300Hz how do you show them from 8 LED's? __________________ Gayan Forum Supporter

10th May 2008, 12:39 PM
EDSON New Member	Thanks Very Much For Your Reply. Best Regards. Edson

Yesterday, 02:03 PM
EDSON New Member	Thanks for your reply. I would appreciate if you could give-me the source code (in MikroC or CCS C) for a pulse counter with the TIMER0, counting frequencies from, say, 10Hz up to 200Hz, with ranges of 10Hz (10,20,30,.....200) with bynary outputs in 8 leds. Best regards and thanks for cortesy. EDSON