Stepper Motor using PIC Microcontroller

This project shows Stepper Motor Control using PIC 16c55 Microcontroller. To simulate this circuit, initially activate Mixed Mode simulator from the Schematic Editor window. Selecting Run Transient analysis from Simulation menu can perform simulation.

This project contains a PIC 16C55/57, a Darlington Transistor Array, a stepper motor, and a voltage source.

In this project, PIC 16C55 Microcontroller outputs the sequence to rotate the stepper motor. Port B of the microcontroller outputs the sequence to the Darlington Transistor Array. The output from the Darlington Transistor Array is send to the stepper motor.

The source code written in Assembly language can be viewed from the code editor window.

The program is as shown:

#include p16c5x.inc ;This header file is included for all PIC projects.

;***** VARIABLE DEFINITIONS

temp_var udata

DVAR2 res 1 ;DVAR2 varible declaration

DVAR res 1 ;DVAR variable declaration

;**********************************************************************

reset_vector code 0x1ff ;processor reset vector

goto start

MAIN CODE 0x000

start

movlw 0x00 ;move literal value to accumulator

tris PORTB ;Set PORT B as output

loop movlw 0x01 ;move literal value to accumulator

movwf PORTB ;move accumulator to portB

call Delay ;call Delay subroutine

movlw 0x02 ;move literal value to accumulator

movwf PORTB ;move accumulator to portB

call Delay ;call Delay subroutine

movlw 0x04 ;move literal value to accumulator

movwf PORTB ;move accumulator to portB

call Delay ;call Delay subroutine

movlw 0x08 ;move literal value to accumulator

movwf PORTB ;move accumulator to portB

call Delay ;call Delay subroutine

goto loop

Delay movlw 0x02 ;move literal value to accumulator

movwf DVAR2 ;move 02 to outer maximum loop count

DelayOuter

movlw 0x02 ;move literal value to accumulator

movwf DVAR ;move 02 to inner maximum loop count

DelayInner

decfsz DVAR,1 ;decrement DVAR if result is not zero execute next step otherwise skip next step

goto DelayInner

decfsz DVAR2,1 ;decrement DVAR2 if result is not zero execute next step otherwie skip next step

goto DelayOuter

RETLW 0

end ;directive end of program'

The source code in the code editor window has to be compiled after making any modifications

(editing). Also the code can be debugged during simulation.