Stepper motor with L293B and pic16f648A

[manjero]

Hi.
Im trying to make a stepper motor move right or left with this pic.
I've connected everything according to examples and the datasheets but still no movement.
i guess its my code and im missing something. i would really appreciate if someone can please point me in the right direction.

DEFINE ADC_CLOCK 3
steps var word
stepArray var byte(4)

CMCON = 7
TRISA = 1
TRISB = %11110000
PORTB = %11111111
input porta.0
input porta.1
stepArray[0] = %00001010
stepArray[1] = %00000110
stepArray[2] = %00000101
stepArray[3] = %00001001

pause 500

main:
if porta.1 = 1 then
steps = steps + 1
endif

if porta.0 = 1 then
steps = steps -1
endif

PORTB = stepArray[steps // 4]
pause 3

goto main

the motor is connected on port b - 0-3 and the buttons are on pins a0 and a1
anyone?

thanks in advance,
Shahar

[Raflex]

Hello, try with this modified code:

DEFINE OSC 4    'Change it for your osc
DEFINE ADC_CLOCK 3
steps var word
stepArray var byte(4)
x var byte

CMCON = 7
TRISA = %00000011   'Porta.0 and porta.1 as input
TRISB = %00000000   'Portb as output, 0=Output, 1=Input
PORTB = 0
x=0
'input porta.0      ' You dont need this, just TRISA command
'input porta.1
stepArray[0] = %00001010
stepArray[1] = %00000110
stepArray[2] = %00000101
stepArray[3] = %00001001

pause 500

main:
if porta.1 = 1 then
     for x=0 to 3
PORTB = stepArray[x]
pause 20 'Change it for diferent speed
next x
endif

if porta.0 = 1 then

for x=0 to 3
PORTB = stepArray[3-x]
pause 20  'Change it for diferent speed
next x
endif



goto main

[manjero]

Thanks Raflex but it still doesnt work. when i use this program with the simulator it gets nothing - the stepper motor isnt even getting ready and all PORTB is not an output.
when i used the original code - i saw the motor getting ready (green) but when i pressed the button - it didnt do anything.

anyone?

[Raflex]

Thanks Raflex but it still doesnt work. when i use this program with the simulator it gets nothing - the stepper motor isnt even getting ready and all PORTB is not an output.
when i used the original code - i saw the motor getting ready (green) but when i pressed the button - it didnt do anything.

anyone?

Check the configuration fuses, mclr, internal or external osc, etc:

@ DEVICE pic16F648a, INTRC_OSC_NOCLKOUT
' System Clock Options (HS_OSC, INTRC_OSC, INTRC_OSC_NOCLKOUT)
@ DEVICE pic16F648a, WDT_OFF 
' Watchdog Timer 
@ DEVICE pic16F648a, PWRT_OFF 
' Power-On Timer 
@ DEVICE pic16F648a, MCLR_OFF 
' Master Clear Options (External) 
@ DEVICE pic16F648a, BOD_ON 
' Brown-Out Detect 
@ DEVICE pic16F648a, LVP_OFF 
' Low-Voltage Programming 
@ DEVICE pic16F648a, CPD_OFF 
' Data Memory Code Protect 
@ DEVICE pic16F648a, PROTECT_OFF 
' Program Code Protection