hoodboi: Thanks bro I rilly apreciate this. I only jst got admitted into unilorin myself through direct entry. It seems a friend of mine is saying he as some conxns in kd dat wud be faster. But let me hear him out, If he's nt making sense I'll come bk. Thank you once again.

Thats OK. Im actually a PG student there, that is why I realy do not stay there, I only go there to see my supervisor!

@engr princejude.i have sucessfully programed my pic with mplab.i cant forgive myself for forgetting to buy a 4mhz crystal when ordering for my pickit3.i have 8,14,27mhz xtal bt d pic wont run with it.my pic doesn't have internal oscilator{pic16f84a-04/p}.i'm using an external RC oscillator which is very unstable.i had to erase my pic severaltimes to make a code to work.the code isn't working verywell since i dnt knw the frequency d pic is operating.thanks for ur help.

hopefullman: @engr princejude.i have sucessfully programed my pic with mplab.i cant forgive myself for forgetting to buy a 4mhz crystal when ordering for my pickit3.i have 8,14,27mhz xtal bt d pic wont run with it.my pic doesn't have internal oscilator{pic16f84a-04/p}.i'm using an external RC oscillator which is very unstable.i had to erase my pic severaltimes to make a code to work.the code isn't working verywell since i dnt knw the frequency d pic is operating.thanks for ur help.

ww1.microchip.com/downloads/en/devicedoc/31002a.pdf‎

Study the above microchip's OSCILLATOR manual.
Read section 2.4 : "External RC Oscillator"

and don't forget to include the reset circuit at "MCLR" pin.
that is, connect 10k resistor from Pin 4(MCLR) to VCC
and 10uF capacitor from Pin4(MCLR) to GND.


But why do you use PIC16F84A-04/P ? That chip is too low and expensive.

Thanks PrinceJude f0r everything..D0es y0ur c0mpany n0w have Pic16f628A?

Tchalz: Thanks PrinceJude f0r everything..D0es y0ur c0mpany n0w have Pic16f628A?

We don't have 16f628A but we have 16f84A, 16F873A, 16F876A

Dot Matrix Scrolling Message Display[size=10pt][/size]

Introduction:

Multiplexed displays are electronic displays where the entire display is not driven at one time. Instead, sub-units of the display (typically, rows or columns for a dot matrix display or individual characters for a character orientated display) are multiplexed, that is, driven one at a time, but the electronics and the persistence of vision combine to make the viewer believe the entire display is continuously active.

10x8 LED dot matrix display:



In the above figure, the rows are negative and columns are positive. Now, if I connect a single column to positive 5V and a single row to negative (0v), then the LED in place of the intersection of the corresponding row and column will glow. Now , if we select a single column(means a +5 volt at selected column) , say column 1 and multiple rows (means connect 0V to few selected rows), say row 1,2 & 8, then the selected 1,2 and 8 LEDs in column 1 will glow. Now if i shift the column(means shifting the positive voltage from column 1 to column 2), and if i change the row data ,then the new data will be displayed in column 2.
Now, if i continuously shift the column and provide row data corresponding to each column, then i can display the different row data (8 bit) in different columns.
. So, if one frame(10 column shift) is completed within 1/16 th of a second, then due to the persistence of vision of our eye, we will feel the entire columns are activated at a time, and thus we will see all the ten -8bit data corresponding to the 10 columns , at a time.
Now, if a set of 8bit data (say 5x8 ) represents a letter, say , 'A' then we will see letter 'A' in the display.

The PIC16F887 provides the 8 bit row data. CD4017 is used to select the column one by one. Now, for shifting the column position, a clock is provided by the PIC to the CD4017. On every clock, the column is shifted .(from right to left in this case).

The code bellow will display a still letter A:

#include <16f887.h>
#fuses HS, NOWDT, NOLVP
#use delay(clock = 8MHz)

void clock(){ output_high(PIN_B6);
              output_low(PIN_B6);
            }
            
void reset(){ output_high(PIN_B7);
              output_low(PIN_B7);
            }
            
void display(unsigned char c)
{
    output_D(c);           /* to display 1/5th of letter                                     */
    delay_ms(1);           /* to display the data in a column for 1ms                        */
    output_D(255);         /* to blank the display                                           */
    clock();               /* to give a clock to CD4017 for column multiplexing              */
}
/////////////////////////////////////////
void main()
{
 delay_ms(100);
                                                         
    while(1)
    {
        reset();               /* to jump to first column from right              */
        display(~0x7e);        /* 1/5 portion of letter A                         */
        display(~0x90);        /* 1/5 portion of letter A                         */
        display(~0x90);        /* 1/5 portion of letter A                         */
        display(~0x7e);        /* 1/5 portion of letter A                         */
        display(~0x00);        /* 1/5 portion of letter A                         */
        reset();               /* to jump to first column from right              */
    }
}

0x7e,0x90,0x90,0x7e,0x00 are hex values that will form the character you want to display on the dot matrix. You can generate the hex values using a "dot matrix font generator" You can download it from here:http://www.instructables.com/id/LED-Scolling-Dot-Matrix-Font-Graphics-Generator-/. It is an excel software

(~) was used to invert the LEDs connection because the hardware connection was not the same as the font generator

Scrolling Message

Code:

#include <16F887.h>
#fuses HS, NOWDT, PUT, NOPROTECT
#use delay(clock = 8MHz)

const char TEXT []={"NIGERIA @ 53 TODAY !!! Happy Independence to all NIARALANDERS "};

int i,j,k,d,n,m,s,DATA;

//------------------------------------------------------------------
const char FONT[96][7] ={
   0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,   //        Space
   0xFB,0xFB,0xFB,0xFB,0xFB,0xFF,0xFB,   //        !
   0xF5,0xF5,0xF5,0xFF,0xFF,0xFF,0xFF,   //        "
   0xF5,0xF5,0xE0,0xF5,0xE0,0xF5,0xF5,   //        #
   0xFB,0xF0,0xEB,0xF1,0xFA,0xE1,0xFB,   //        $
   0xE3,0xEA,0xE5,0xFB,0xF4,0xEA,0xF8,   //        %
   0xF7,0xEB,0xEB,0xF7,0xEA,0xED,0xF2,   //        &
   0xF9,0xF9,0xFD,0xFB,0xFF,0xFF,0xFF,   //        '
   0xFD,0xFB,0xF7,0xF7,0xF7,0xFB,0xFD,   //        (
   0xF7,0xFB,0xFD,0xFD,0xFD,0xFB,0xF7,   //        )
   0xFB,0xEA,0xF1,0xFB,0xF1,0xEA,0xFB,   //        *
   0xFF,0xFB,0xFB,0xE0,0xFB,0xFB,0xFF,   //        +
   0xFF,0xFF,0xFF,0xF3,0xF3,0xFB,0xF7,   //        ,
   0xFF,0xFF,0xFF,0xF1,0xFF,0xFF,0xFF,   //        -
   0xFF,0xFF,0xFF,0xFF,0xFF,0xF3,0xF3,   //        .
   0xFF,0xFE,0xFD,0xFB,0xF7,0xEF,0xFF,   //        /
   0xF1,0xEE,0xEC,0xEA,0xE6,0xEE,0xF1,   //        0
   0xFB,0xF3,0xFB,0xFB,0xFB,0xFB,0xF1,   //        1
   0xF1,0xEE,0xFE,0xF1,0xEF,0xEF,0xE0,   //        2
   0xF1,0xEE,0xFE,0xF9,0xFE,0xEE,0xF1,   //        3
   0xFD,0xF9,0xF5,0xED,0xE0,0xFD,0xFD,   //        4
   0xE0,0xEF,0xE1,0xFE,0xFE,0xFE,0xE1,   //        5
   0xF9,0xF7,0xEF,0xE1,0xEE,0xEE,0xF1,   //        6
   0xE0,0xFE,0xFD,0xFB,0xF7,0xF7,0xF7,   //        7
   0xF1,0xEE,0xEE,0xF1,0xEE,0xEE,0xF1,   //        8
   0xF1,0xEE,0xEE,0xF0,0xFE,0xFD,0xF3,   //        9
   0xFF,0xF3,0xF3,0xFF,0xF3,0xF3,0xFF,   //        :
   0xF3,0xFB,0xF3,0xF3,0xFF,0xF3,0xF3,   //        ;        
   0xFD,0xFB,0xF7,0xEF,0xF7,0xFB,0xFD,   //        <
   0xFF,0xFF,0xF1,0xFF,0xF1,0xFF,0xFF,   //        =
   0xF7,0xFB,0xFD,0xFE,0xFD,0xFB,0xF7,   //        >
   0xF1,0xEE,0xFE,0xFD,0xFB,0xFF,0xFB,   //        ?
   0xF1,0xEE,0xFE,0xF2,0xEA,0xEA,0xF1,   //        @
   0xFB,0xF5,0xEE,0xEE,0xE0,0xEE,0xEE,   //        A
   0xE1,0xF6,0xF6,0xF1,0xF6,0xF6,0xE1,   //        B
   0xF1,0xEE,0xEF,0xEF,0xEF,0xEE,0xF1,   //        C
   0xE1,0xF6,0xF6,0xF6,0xF6,0xF6,0xE1,   //        D
   0xE0,0xEF,0xEF,0xE3,0xEF,0xEF,0xE0,   //        E
   0xE0,0xEF,0xEF,0xE3,0xEF,0xEF,0xEF,   //        F
   0xF1,0xEE,0xEF,0xE8,0xEE,0xEE,0xF1,   //        G
   0xEE,0xEE,0xEE,0xE0,0xEE,0xEE,0xEE,   //        H
   0xF1,0xFB,0xFB,0xFB,0xFB,0xFB,0xF1,   //        I
   0xF8,0xFD,0xFD,0xFD,0xFD,0xFD,0xF3,   //        J
   0xEE,0xED,0xEB,0xE7,0xEB,0xED,0xEE,   //        K
   0xEF,0xEF,0xEF,0xEF,0xEF,0xEF,0xE0,   //        L
   0xEE,0xE4,0xEA,0xEA,0xEE,0xEE,0xEE,   //        M
   0xEE,0xE6,0xEA,0xEC,0xEE,0xEE,0xEE,   //        N
   0xF1,0xEE,0xEE,0xEE,0xEE,0xEE,0xF1,   //        O
   0xE1,0xEE,0xEE,0xE1,0xEF,0xEF,0xEF,   //        P
   0xF1,0xEE,0xEE,0xEE,0xEA,0xED,0xF2,   //        Q
   0xE1,0xEE,0xEE,0xE1,0xEB,0xED,0xEE,   //        R  
   0xF1,0xEE,0xEF,0xF1,0xFE,0xEE,0xF1,   //        S
   0xE0,0xFB,0xFB,0xFB,0xFB,0xFB,0xFB,   //        T
   0xEE,0xEE,0xEE,0xEE,0xEE,0xEE,0xF1,   //        U
   0xEE,0xEE,0xEE,0xF5,0xF5,0xFB,0xFB,   //        V
   0xEE,0xEE,0xEE,0xEA,0xEA,0xE4,0xEE,   //        W
   0xEE,0xEE,0xF5,0xFB,0xF5,0xEE,0xEE,   //        X
   0xEE,0xEE,0xF5,0xFB,0xFB,0xFB,0xFB,   //        Y
   0xE0,0xFE,0xFD,0xFB,0xF7,0xEF,0xE0,   //        Z
   0xF1,0xF7,0xF7,0xF7,0xF7,0xF7,0xF1,   //        [
   0xFF,0xEF,0xF7,0xFB,0xFD,0xFE,0xFF,   //        \
   0xF1,0xFD,0xFD,0xFD,0xFD,0xFD,0xF1,   //        [
   0xFB,0xF5,0xEE,0xFF,0xFF,0xFF,0xFF,   //        ^
   0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xE0,   //        _
   0xF3,0xF3,0xF7,0xFB,0xFF,0xFF,0xFF,   //        `
   0xFF,0xFF,0xF1,0xFE,0xF0,0xEE,0xF1,   //        a
   0xEF,0xEF,0xE9,0xE6,0xEE,0xE6,0xE9,   //        b
   0xFF,0xFF,0xF8,0xF7,0xF7,0xF7,0xF8,   //        c
   0xFE,0xFE,0xF2,0xEC,0xEE,0xEC,0xF2,   //        d
   0xFF,0xFF,0xF1,0xEE,0xE0,0xEF,0xF1,   //        e
   0xF9,0xF6,0xF7,0xE1,0xF7,0xF7,0xF7,   //        f
   0xFF,0xFF,0xF0,0xEE,0xF0,0xFE,0xF1,   //        g
   0xEF,0xEF,0xE9,0xE6,0xEE,0xEE,0xEE,   //        h
   0xFB,0xFF,0xF3,0xFB,0xFB,0xFB,0xF1,   //        i
   0xFD,0xFF,0xF9,0xFD,0xFD,0xFD,0xF3,   //        j
   0xF7,0xF7,0xF6,0xF5,0xF3,0xF5,0xF6,   //        k
   0xF3,0xFB,0xFB,0xFB,0xFB,0xFB,0xF1,   //        l
   0xFF,0xFF,0xE5,0xEA,0xEA,0xEA,0xEA,   //        m
   0xFF,0xFF,0xE9,0xE6,0xEE,0xEE,0xEE,   //        n
   0xFF,0xFF,0xF1,0xEE,0xEE,0xEE,0xF1,   //        o
   0xFF,0xFF,0xE1,0xEE,0xE1,0xEF,0xEF,   //        p
   0xFF,0xFF,0xF0,0xEE,0xF0,0xFE,0xFE,   //        q
   0xFF,0xFF,0xE9,0xE6,0xEF,0xEF,0xEF,   //        r
   0xFF,0xFF,0xF0,0xEF,0xF1,0xFE,0xE1,   //        s
   0xFB,0xFB,0xF0,0xFB,0xFB,0xFB,0xFC,   //        t
   0xFF,0xFF,0xEE,0xEE,0xEE,0xEC,0xF2,   //        u
   0xFF,0xFF,0xEE,0xEE,0xEE,0xF5,0xFB,   //        v
   0xFF,0xFF,0xEE,0xEE,0xEA,0xEA,0xF4,   //        w
   0xFF,0xFF,0xEE,0xF5,0xFB,0xF5,0xEE,   //        x
   0xFF,0xFF,0xEE,0xF5,0xFB,0xFB,0xF3,   //        y
   0xFF,0xFF,0xE0,0xFD,0xFB,0xF7,0xE0,   //        z
   0xF9,0xF7,0xF7,0xE7,0xF7,0xF7,0xF9,   //        {
   0xFB,0xFB,0xFB,0xFF,0xFB,0xFB,0xFB,   //        |
   0xF3,0xFD,0xFD,0xFC,0xFD,0xFD,0xF3,   //        }
   0xF5,0xEA,0xFF,0xFF,0xFF,0xFF,0xFF};  //        ~
//------------------------------------------------------------------

void main()
{
   OUTPUT_A(0x00);
   OUTPUT_B(0x00);
   
   while(TRUE)
   {
       for(j=0;j<8;j++)
       {      
       for(i=d;i<d+8;i++)
         {
            DATA = ~FONT[TEXT [i]-' '][j];  
            if(j==7)DATA=0x00;
            for(k=0;k<8;k++)
            {
               OUTPUT_BIT(PIN_A1,shift_left(&DATA,1,0));
               if(k>=2){
                           OUTPUT_HIGH(PIN_A0);
                           OUTPUT_LOW (PIN_A0);
                       }
           } 
         }
       OUTPUT_HIGH(PIN_A2);
       delay_ms(5);
       OUTPUT_LOW (PIN_A2);
       OUTPUT_B(s+=1);
       }
       m+=1;
       if(m==5){m=0;n+=1;};
       if(n==6){n=0;d+=1;}
       if(d==34)d=0;
    }
}

_{...run to church will upload the circuit later}

Thank you s0 much br0 f0r this tut0rial..I reserve my questi0ns f0r n0w until y0u are thr0ugh,c0s I'v s0 many t0 ask.

The Circuit:

The circuit's PDF is here: http://www.4shared.com/office/xePzVxmb/Matrix.html

princejude:

ww1.microchip.com/downloads/en/devicedoc/31002a.pdf‎

Study the above microchip's OSCILLATOR manual.
Read section 2.4 : "External RC Oscillator"

and don't forget to include the reset circuit at "MCLR" pin.
that is, connect 10k resistor from Pin 4(MCLR) to VCC
and 10uF capacitor from Pin4(MCLR) to GND.


But why do you use PIC16F84A-04/P ? That chip is too low and expensive.

i've downloaded d book.almost same as pic16f8x datasheet.the formula 4d rc osc frequency wasnt shown.they only recomend values for r&c.is there a formula to cal the frequency?i'v read f=1/RC bt it's nt acurate.it doesnt take temp&voltage into consideratn.i tink microchip intentionaly hid ths info.jst want 2know d speed my uc 's runing

hopefullman:
i've downloaded d book.almost same as pic16f8x datasheet.the formula 4d rc osc frequency wasnt shown.they only recomend values for r&c.is there a formula to cal the frequency?i'v read f=1/RC bt it's nt acurate.it doesnt take temp&voltage into consideratn.i tink microchip intentionaly hid ths info.jst want 2know d speed my uc 's runing

I will advice you to use crystal, forget about the RC. If you can't get 4MHz(or less) crystal then change your chip to Pic16f84a or any that can accept high crystal value.

princejude:

I will advice you to use crystal, forget about the RC. If you can't get 4MHz(or less) crystal then change your chip to Pic16f84a or any that can accept high crystal value.

my chip is pic16f84a-04/p.as per datashet,it's max frequency is4mhz ***sad***

I am g0ing t0 try 0ut this project..Sir,is it p0ssible t0 cascade 2 10 by 5 displays using 2 CD4017s t0 s0urce currents f0r the LEDs? Just in case I want t0 increase the length of the display..

@Prince. Please how long does the training for students last, how many programs are involved and how much is the fee. I appreciate ur tireless effort and would want to gain more knowledge. Am currently a windows programmer using vb.net and SQL server database. Your reply will very appreciated.

cjs10lib: @Prince. Please how long does the training for students last, how many programs are involved and how much is the fee. I appreciate ur tireless effort and would want to gain more knowledge. Am currently a windows programmer using vb.net and SQL server database. Your reply will very appreciated.

The training time table is here: http://www.microscale-embedded.com/index.php?option=com_content&view=article&id=47&Itemid=50

MST101: Embedded System Using PIC microcontroller with application in GSM modem ----- N65k

MST106: Embedded System Using AVR Microcontroller with application in GPS receiver ----N65K

MST108: Embedded System Using 8051 Microcontroller with application in RFID -- ---- N65K

Open the training link above to see other courses.
The duration depends on the type of training you choose.
The "Fast Track Courses" will be between 4 to 6 hours for 1 week
The "Modular Track Courses" will be between 2 to 3 hours for 2 weeks

The N65k covers the cost of all the training materials including development kit, programmer, microcontroller, training manual with sample codes, and all the software required for the training.

Is it possible 2 combine 2 voltage regulators 78XX to get a current of 2A.

pheforusty: Is it possible 2 combine 2 voltage regulators 78XX to get a current of 2A.

It is possible, but you must add some diodes (D1 and D2) in the link below to protect the regulators.
http://www.instructables.com/id/Increasing-current-on-78xx-series-regulators/

You can also use a pass transistor as show below:
http://electronicsjmbh..com/2012/02/power-supply-5-volts-5-with-pass.html

...... your transformer must be up to 2A (or more)

princejude:

It is possible, but you must add some diodes (D1 and D2) in the link below to protect the regulators.
http://www.instructables.com/id/Increasing-current-on-78xx-series-regulators/

You can also use a pass transistor as show below:
http://electronicsjmbh..com/2012/02/power-supply-5-volts-5-with-pass.html

...... your transformer must be up to 2A (or more)

tenk u.

Having read dis thread 4rm d ist 2 d 12th page i mst say dat am gr8ly impressed,making me feel like a software engineer already..@Princejude thanks alot 4ur immeasurable sacrifice uve made on d newbies on this thread,i rili du appreciate it....i saw some documentary lately on CCTV-news,about some robotics chalenge,and 4rm wt i saw ,its like Egypt has its robots ready 4d chalenge,i saw some gr8 wrks of d egyptian team of programmers (including ladies) and i mst say,i wept for my beloved country,coz all we du is 2 create mobile apps,websites and some oda non chalenging projects...i was gingered 2 len robotics,of wc u have made me 2undestand dat 2b a good software engineer one haz 2 len C folowed by assembly...aldo i dnt kw any 4now dats y i got confused wen i saw d code snippets uv bin pasting here...anywaz thanks once again,wen am redy ill definately revisit dis thread 4mr info...thanks....

when i connect the usb cable of my topwin to the usb port on my window 7 64bit and click on the topwin icon on the desktop,it will read usb error! Reload usb driver and when i click on the reload usb driver, it will also give Can`t loading USB Driver. please help me i will appreciate thanks.

jetmaster: when i connect the usb cable of my topwin to the usb port on my window 7 64bit ...

Test the topwin with window XP first,may be the driver is not compatible with window 7. Topwin universal progrsmmer I have used only worked wiith XP.

Does microscale have dc generator?the dc generator should be able to produce 12v dc at low rpm.thanks

.

Ishsoph: .

Are you into programming electronics?

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