blinking LED

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  1. - 14th July 2009, 14:32 #1
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    Default blinking LED

    Hi..
    By using PICBASIC PRO and PIC16F84a how I can make this:
    Port a.1 high for 6 sec & in the same time porta.0 blinking ???
  2. - 14th July 2009, 17:10 #2
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    Code:
    	CounterA var Byte

	LEDA var PortA.0
	LEDB var PortA.1

	Low LEDA
	Low LEDB

Start:
	High LEDB			' PortA.1 goes High
	For CounterA=1 to 6		' For Six seconds
		Gosub BlinkyOne		' Whilst Blinky blinks
		Next CounterA
	Low LEDB			' PortA.1 then goes LOW
EndLoop:				' and Blinky continues forever
	Gosub BlinkyOne			
	Goto EndLoop			' until you get bored and switch off

	'
	'	Subroutine Blinks LEDA across 1 Second
	'	--------------------------------------
BlinkyOne:
	High LEDA
	Pause 500
	Low LEDA
	Pause 500
	Return
    C'mon Guys... lets have another five different ways of doing this... then all the students who are using this forum for answers to their homework assignments can each have a different method and not be accused of copying...
  3. - 14th July 2009, 19:11 #3
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    Default

    Code:
    	CounterA var Byte

	LEDA var PortA.0
	LEDB var PortA.1

	Low LEDA
	Low LEDB

Start:
	High LEDB			' PortA.1 goes High
	For CounterA=1 to 6*2		' For Six*2    half seconds
		Gosub BlinkyHalf		' Whilst Blinky blinks
	Next CounterA
	Low LEDB			        ' PortA.1 then goes LOW
        pause 10000           ' a 10 second gap and then go blinkety blink
EndLoop:
	Gosub BlinkyHalf			
	Goto EndLoop			' until you get bored and switch off

	'
	'	Subroutine Blinks LEDA across 1 Second
	'	--------------------------------------
BlinkyHalf:
	Toggle LEDA
	Pause 500
	Return
    Melanie, I hope you don't mind me using my brain to mod your code. However, as you have it, it is a variation of blinky. More to come ??

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  4. - 14th July 2009, 20:45 #4
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    Blinkcounter var byte
    clear

    start:
    High porta.1 'high port
    high porta.0 'on led
    pause 500
    low porta.0 'off led
    pause 500
    let blinkcounter = (blinkcounter + 1)
    if blinkcounter < 6 then start
    low porta.1
    low porta.0
    pause 1000
    goto start 'keep it going
  5. - 14th July 2009, 22:32 #5
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    untested . . .
    Code:
    PortA = %00000000
TrisA = %00000000
i var byte
Start:
PortA.1 = 1
while PortA.1 = 1
For i = 0 to 5
portA.0 = 1
pause 500
PortA.0 = 0
pause 500
next i
portA.1 = 0
wend

end
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  6. - 15th July 2009, 01:55 #6
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    Default

    I know, wrong chip and wrong pins... it is what I have on the bench...
    Code:
    '18F6680'07/14/09'BLINKY
   
    DEFINE OSC 20
    @ __CONFIG    _CONFIG1H, _OSC_HS_1H
    @ __CONFIG    _CONFIG2H, _WDT_ON_2H &amp; _WDTPS_128_2H
    @ __CONFIG    _CONFIG4L, _LVP_OFF_4L
    CNT VAR BYTE
    FIRST6:HIGH PORTB.2 'SLOW
    FOR CNT = 1 TO 60:TOGGLE PORTG.4:PAUSE 100
    NEXT CNT:LOW PORTB.2:PAUSE 500:GOTO SECOND6
    
    SECOND6:HIGH PORTB.2   'FAST BLINK--REALLY FAST
    PWM PORTG.4,5,6000
    LOW PORTB.2:PAUSE 500:GOTO [color=#0000FF][b]FIRST6
    Last edited by mackrackit; - 8th April 2011 at 07:11. Reason: HTML to BB
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  7. - 15th July 2009, 02:50 #7
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    Default

    Code:
    PortA = 0
TrisA = 0

Seconds var Byte

LED_1      var PortA.0
LED_2      var PortA.1

Loop:
'Your gosub comand goes here
Goto Loop


Blink:
High Led_1
Seconds = 0
While Seconds <>5
High Led_2
pause 500
Low Led_2
pause 500
Seconds = Seconds + 1
wend
Low Led_1
Return

End
    Here my contribution.

    Al.
    All progress began with an idea
  8. - 15th July 2009, 03:25 #8
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    Default

    how about the easiest one out there:

    Code:
    Start:

High Porta.1

High porta.0
Pause 500
Low Porta.0
Pause 500                       '1 second

High porta.0
Pause 500
Low Porta.0
Pause 500                       '2 seconds

High porta.0
Pause 500
Low Porta.0
Pause 500                        '3 seconds

High porta.0
Pause 500
Low Porta.0
Pause 500                       '4 seconds

High porta.0
Pause 500
Low Porta.0
Pause 500                       '5 seconds

High porta.0
Pause 500
Low Porta.0
Pause 500                       '6 seconds

Low Porta.1
pause 1000

goto start
    it might not be the smallest in code size, but it will work and its really easy to understand!!!
  9. - 15th July 2009, 08:15 #9
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    Here is mine.

    No PAUSE used !
    Code:
    @ DEVICE PIC16F628A, INTRC_OSC_NOCLKOUT, WDT_OFF, PWRT_OFF, MCLR_OFF,PROTECT_ON,CPD_ON ,BOD_OFF,LVP_OFF

TRISA=0
TRISB=0
CMCON=7               ' PortA=digital I/O
PAUSE 1
VRCON=0
PAUSE 1

PORTA=0
PORTB=0

T1CON=%00110001       ' 0.524ms
TMR1IF VAR PIR1.0       ' Overflow bit of Timer1.

Output1 VAR PORTA.1     ' Blink 6secs.
Output2 VAR PORTA.0     ' Blink 0.5secs.

PreLoad     VAR WORD
TimeCount   VAR BYTE
TimetoBlink VAR BYTE

PreLoad=3036 ' to get 500ms.
TMR1L=PreLoad.LowByte
TMR1H=PreLoad.HighByte

TimeCount=0
TimetoBlink=12 '12=6secs.

PAUSE 50         ' OSC to Settle.


Start:


   IF TMR1IF THEN Blink

   GOTO Start
    
    

Blink: 'Each int is 0.500 sec.
    TMR1L=PreLoad.LowByte   ' Load the timer with preload value.
    TMR1H=PreLoad.HighByte
    TimeCount=TimeCount + 1 ' Count interrupts.
    Output2=Output2 ^ 1     ' Toggle fast blinking output.    

    IF TimeCount=TimetoBlink THEN '6Secs ON, 6secs OFF.
      TimeCount=0                   
      Output1=Output1 ^ 1 
    ENDIF
   
    TMR1IF=0                ' Clear TMR1 int. flag.  
    
    GOTO Start    
    
END
    Last edited by mackrackit; - 8th April 2011 at 07:07. Reason: HTML TO BB
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  10. - 15th July 2009, 09:10 #10
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    Quote Originally Posted by Joe S. View Post
    untested . . .
    Code:
    PortA = %00000000
TrisA = %00000000
i var byte
Start:
PortA.1 = 1
while PortA.1 = 1
For i = 0 to 5
portA.0 = 1
pause 500
PortA.0 = 0
pause 500
next i
portA.1 = 0
wend

end

    Hi..
    Thanks for all
    I test your code and its working fine but because I am new with picbasic what dose this meen
    PortA = %00000000
    TrisA = %00000000
    When I remove this tow lines the code not working,
    Best regard
  11. - 15th July 2009, 10:48 #11
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    PORTA = %00000000 read this as PORTA gets bits 00000000
    This means, write 0 to each bit position of PORTA. Each 0 represents the bits in PORTA from bit 7 to bit 0. You could also write it as
    PORTA = $00 read this as PortA gets Hex 0

    TRISA = %00000000
    This is the tristate register which tells your PIC to allow the values of PORTA to 'drive' the external world circuits. Same as above for the bit position part. If you set any 1 position to 1, that position will only be able to read (INPUT) from the external circuit.

    Clear now? Don't hesitate to ask. See how many responses you got.
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  12. - 31st July 2009, 16:06 #12
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    Default A slight modification to Sayzer's code

    I am looking for a way to change the rate of blink (Blinking rate) using Interrupt. I would read a POT using ADC and then change the blink rate, Any idea how I could impliment it in Sayzer's code.

    Thanks.

    p.s. maybe using TMR0
  13. - 31st July 2009, 16:34 #13
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    A question for you first... why do you specify using INTERRUPT?
  14. - 31st July 2009, 16:57 #14
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    Cause, I want to use it in a code where I am doing some other things like reading ADC channel , and monitoring inputs , while the led is blinking.

    Thanks
  15. - 31st July 2009, 17:08 #15
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    You may want to look at this. Post #2 might be of interest.
    http://www.picbasic.co.uk/forum/showthread.php?t=3251
    Dave
    Always wear safety glasses while programming.
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