PIC BASIC COMPILER

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'PROGRAM NAME: CONTROLLER WITH BUTTON

'AUTHOUR: (LEDLABS)

'A PROGRAM TO TURN  A STEPPER MOTOR 90 DEGREES AND 'WAIT FOR 10 SECONDS

'THEN TURN BACK TO POINT OF ORIGIN WHEN BUTTON 'PRESSED

'DATE WRITTEN: 18/6/xx

'LANGUAGE: PIC BASIC COMPILER

'VERSION: 1A

'STEPPER MOTOR: 3.6 DEGREES STEP/ RESOLUTION

'PIC MICROCONTROLLER: 16F628A

'100 milliamps used when motor in use for 4 seconds there and back

'1 milliamps in its quiescent state

output 4 ' unused pins set as outputs

output 5 ' to avoid floating inputs

output 7 ' and pickup

b5 = 0 'working button variable set zero

SYMBOL delay = B0 ' use b0 as the delay variable

delay = 75 ' set the delay to 75 msecs

loop: BUTTON 6,0,255,10,b5,0,notp

for B2 = 1 TO 4 'loop counter

HIGH 0 ' turn on transistor1

PAUSE delay ' wait 75 ms

LOW 0 ' turn off transistor1

HIGH 1 ' turn on transistor2

PAUSE delay ' wait 75 ms

LOW 1 ' turn off transistor2

HIGH 2 ' turn on transistor3

PAUSE delay ' wait 75 ms

LOW 2 ' turn off transistor3

HIGH 3 ' turn on transistor4

PAUSE delay ' wait 75 ms

LOW 3 ' turn off transistor4

next B2

pause 10000      '10 sec delay

' pause 30000 '30sec delay for test purposes, for longer delays than     '30secs, separate pause 'commands can be used on different lines and the total time adds up.

for b3 = 1 to 4 'loop counter

high 3 ' turn on Q4

pause delay ' wait for delay ms

low 3 ' turn off Q4

high 2 ' turn on Q3

pause delay ' wait for delay ms

low 2 ' turn off Q3

high 1 ' turn on Q2

pause delay ' wait for delay ms

low 1 ' turn off Q2

high 0 ' turn on Q1

pause delay ' wait for delay ms

low 0 ' turn off Q1

next b3

pause 1000

notp:

goto loop

end

THIS IS THE SAME AS THE OTHER STEPPER ROUTINE PROGRAM ON HERE, APART FROM IT HAS A BUTTON COMMAND AND TIME DELAY,  HOW THIS PROGRAM WORKS, IS IT WAITS FOR AN INPUT SIGNAL, THIS COULD BE A BUTTON, SEE THE LOOP ABOVE THIS HAS THE BUTTON COMMAND 'PART OF PIC BASIC COMPILER INSTRUCTION SET' BY MICRO ENGINEERING LABS.

AND IT BASICALLY STAYS IN THE LOOP UNTIL IT BREAKS OUT BY A BUTTON BEEN PRESSED ON PIN 6 OF THE PIC MICROCONTROLLER, THIS PIN CAN BE CHANGED BY CHANGING THE BUTTON PIN, SAY TO 5 FOR EXAMPLE, THE OTHER INFORMATION IN THIS COMMAND IS SWITCH DEBOUNCE, BUTTON PULL-UP/PULL-DOWN ETC.

THEN THE PROGRAM WAITS BY THE PAUSE COMMAND WHICH CAN BE CHANGED

THEN IT RUNS THE PROGRAM BACKWARDS WHICH TURNS THE STEPPER BACK TO THE POINT OF ORIGIN.

THIS IS HOW THE BUTTON COMMAND CAN BE SET:

BUTTON PIN,DOWN,DELAY,RATE,BVAR,ACTION,LABEL

PIN : IS MADE AN INPUT AUTOMATICALLY

DELAY : CYCLE COUNT BEFORE AUTO REPEAT (0-255) IF 0 NO DEBOUNCE

RATE: AUTO REPEAT RATE (0-255)

BVAR : BYTE SIZE VARIABLE USED FOR DELAY AND MUST BE INITIALIZED TO 0 IN DECLARATION OF PROGRAM.

ACTION : STATE OF BUTTON TO ACT 0 IF NOT PRESSED 1 IF PRESSED

LABEL : PROGRAM RESUMES AT THIS LABEL IF ACTION IS TRUE

SEE MICRO ENGINEERING LABS INC 'PIC BASIC COMPILER' FOR FULL INSTRUCTION SET

THE BUTTON REQUIRES A PULL DOWN RESISTOR, OR PULL-UP DEPENDING ON BUTTON COMMAND IN THE ACTION VARIABLE. EITHER SET TO 1 OR 0                                                                           THESE PULLUP/PULLDOWN SWITCHES ARE ON LEDLABS ALREADY, AS IS THE STEPPER MOTOR MODULE.