8 leds project problem

hesho90 · Sep 27, 2012

i got 8 leds and pic 16f877a

i made the code

Code:

void main() 
{TRISB=0; PORTB=0;

        Loop:

PORTB=0B00000001; delay_ms(500);

PORTB=0B00000011; delay_ms(500);

PORTB=0B00000111; delay_ms(500);

PORTB=0B00001111; delay_ms(500);

PORTB=0B00011111; delay_ms(500);

PORTB=0B00111111; delay_ms(500);

PORTB=0B01111111; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

PORTB=0B00000000; delay_ms(500);

 PORTB=0B00011000; delay_ms(500);
 
 PORTB=0B00111100; delay_ms(500);
 
 PORTB=0B01111111; delay_ms(500);
 
 PORTB=0B00000000; delay_ms(500);
 
PORTB=0B11111111; delay_ms(500);

PORTB=0B00000000; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

goto loop;}

albert22 · Sep 27, 2012

You dont say what your problem is .
Probably that the led at RB4 will not work as that output is open collector.

hesho90 · Sep 27, 2012

they dont led up in the bread board

albert22 · Sep 27, 2012

Make sure that the configuration bits are correct by specifying them at the source code or at the programmer.
In your schematic there is no crystal on the oscillator pins. It should be there in the real circuit.
There are other options other than a crystal to make the F877A work but what ever you use must be correctly set in the configuration bits.
Once you get it working check RB4 on the datasheet that led is not going to lit in your circuit.

internetuser2k12 · Sep 27, 2012

Are you using mikroC? Have you set the right clock frequency in real hardware and also in mikroC?

bigdogguru · Sep 27, 2012

As internetuser2k12 points out many of the MikroC library routines rely on the correct Oscillator Frequency (Fosc) being specified in the MikroC IDE.

All delay routines are among these which require the Oscillator Frequency be properly specified.

You can enter the Fosc in the menu item Project => Edit Project... dialog box.

You can also ensure the proper Configuration Register settings within the same dialog box as albert22 has pointed out.

Ensure you have disabled the watchdog timer, otherwise the PIC will continually reset instead of fully executing your code.

And disabled both Low Voltage Programming (LVP) and Debugging as these features utilize RB3, RB6 and RB7.

An alternative would be to move the LEDs to PORTD which does not share its pins with other peripheral modules or features.

I would also recommend utilizing an infinite loop (SuperLoop), rather than the use of a GOTO.

You might try the following:

Code:

void main() 
{
        TRISB=0; 
        PORTB=0;

        while(1)
        {
                PORTB++;
                delay_ms(500);
        }

}

BigDog

hesho90 · Sep 27, 2012

internetuser2k12 said:
Are you using mikroC? Have you set the right clock frequency in real hardware and also in mikroC?

im sure of the clock frequency
im using mikroc

wp100 · Sep 27, 2012

albert22 said:
Probably that the led at RB4 will not work as that output is open collector.

Hi,

Think you have got your Ports mixed up, its RA4 thats open drain.

hesho90 · Sep 27, 2012

i did chang the code didn t know what to chang but here is a phto of the circket on breadboard and the edit project

- - - Updated - - -

i did chang the code didn t know what to chang but here is a phto of the circket on breadboard and the edit project

sky_123 · Sep 27, 2012

Is your microcontroller powered up? (guessing PICs use the pin 20/40 convention, but it was hard to see if they were connected).

hesho90 · Sep 27, 2012

yes i wierd pin 11 and 32 to power and pin 1 to

sky_123 · Sep 27, 2012

ok. I can't see that in your photos. You need to make sure the reset pin (whichever that one is) is also set to not reset (check the datasheet to
see if you need a resistor and capacitor on the reset pin or not. Also, put a 100nF decoupling capacitor across the microcontroller supply pins.
How are you powering up? From a battery? Is there a voltage regulator?

albert22 · Sep 27, 2012

Sorry. My fault RB4. Is not open Drain.
I see the connection to Vdd on pins 11 and 32.
But I dont see the required Vss on pins 12 and 31 to GND.
To make sure the pic is powered. check for +5 ( pins 11 and 32 ) referenced to pins 12 and 31. Do this placing the multimeter directly on the IC pins.

bigdogguru · Sep 27, 2012

hesho90 said:
i did chang the code didn t know what to chang but here is a phto of the circket on breadboard and the edit project

You need to change the Oscillator Selection of Configuration Register settings to XT or HS, it is current set to RC.

I would also advise you to upgrade to a more recent version, as the Background Debugging Selection of the Configuration Register Settings appears to be missing.

Background Debugging needs to be disabled.

BigDog

hesho90 · Sep 27, 2012

there is no reset pin i think

the power is normel 4.5 v come from 3 1.5v battres

bigdogguru · Sep 27, 2012

hesho90 said:
there is no reset pin i think

The Master Clear (MCLR) pin is the reset pin and needs to be pulled high with a 10kΩ resistor.

BigDog

hesho90 · Sep 27, 2012

i have connected the 11/32 to power and 12/32 to ground and 13/14 to the xrtl 4mhz and connect bpth ofhet pin to 27pf and both of them to ground and the the (+) of the leds to 330omh and the other side to portb and and there(-) togther and the last one to the groun of the battery

- - - Updated - - -

what to chang in thin code

Code:

void main() 
{TRISB=0; PORTB=0;

        Loop:

PORTB=0B00000001; delay_ms(500);

PORTB=0B00000011; delay_ms(500);

PORTB=0B00000111; delay_ms(500);

PORTB=0B00001111; delay_ms(500);

PORTB=0B00011111; delay_ms(500);

PORTB=0B00111111; delay_ms(500);

PORTB=0B01111111; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

PORTB=0B00000000; delay_ms(500);

 PORTB=0B00011000; delay_ms(500);
 
 PORTB=0B00111100; delay_ms(500);
 
 PORTB=0B01111111; delay_ms(500);
 
 PORTB=0B00000000; delay_ms(500);
 
PORTB=0B11111111; delay_ms(500);

PORTB=0B00000000; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

PORTB=0B11111111; delay_ms(500);

goto loop;}

bigdogguru · Sep 28, 2012

What is the progress on your project?

Have you managed to blink the LEDs?

Ensure you use the CODE tags (#) button rather than QUOTE tag button as the CODE tags retain the proper formating.

Again, I would suggest avoiding the use of GOTOs in C code, its considered a bad habit and technique.

Try using a infinite loop (SuperLoop):

Code:

void main() 
{TRISB=0; PORTB=0;

        while(1)
        {

                PORTB=0B00000001; delay_ms(500);

                PORTB=0B00000011; delay_ms(500);

                PORTB=0B00000111; delay_ms(500);

                PORTB=0B00001111; delay_ms(500);

                PORTB=0B00011111; delay_ms(500);

                PORTB=0B00111111; delay_ms(500);

                PORTB=0B01111111; delay_ms(500);

                PORTB=0B11111111; delay_ms(500);

                PORTB=0B00000000; delay_ms(500);

                PORTB=0B00011000; delay_ms(500);
 
                PORTB=0B00111100; delay_ms(500);
 
                PORTB=0B01111111; delay_ms(500);
 
                PORTB=0B00000000; delay_ms(500);
 
                PORTB=0B11111111; delay_ms(500);

                PORTB=0B00000000; delay_ms(500);

                PORTB=0B11111111; delay_ms(500);

                PORTB=0B11111111; delay_ms(500);
        }
}

BigDog

hesho90 · Sep 28, 2012

thank you very match everyone it warked it make me happey

here is a video of it

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