User`s manual

ROBOT . HEAD to TOE

Product User’s Manual – SD02B

6.2 Sample Program for PIC18F4520

Driving stepper motor is common necessity in most robotic project based on the embedded

system which uses microcontroller. Considering this reason, Cytron Technologies has also

developed the sample source code for PIC18F microcontroller using MPLAB C18 C

Compiler. This sample program is developed for PIC18F4520. If user uses different PIC

microcontroller, user may need to modify the sample program based on that particular

microcontroller by referring to its datasheet released by Microchip Technology Inc.

The sample program will control two SD02Bs. Since this PIC only has one hardware UART,

we have to generate another additional UART using software approach to control the second

SD02B.

a. The sample program can be downloaded from Cytron website, (www.cytron.com.my), in

SD02B product page.

b. Extract the file named “Dual UART sample program.zip”.

c. There are 4 files available for the user; 18F sample program.mcp (MPLAB project

file)., 18F sample program.mcw (MPLAB workspace file), 18F4520-dual uart

sample.c (source code in C language) and 18F sample program.hex (HEX file). For

immediate testing, user may load 18F sample program.hex to PIC18F4520 and plug into

microcontroller board which was being completed in step c.

d. The sample program is based on SK40B startup kit. We will discuss about how to control

two SD02Bs and two stepper motor using a SK40B through UART interface.

e. Ensure the hardware interface for microcontroller to SD02B is setup properly. Besides,

the power for stepper motor is also needed. Please refer to section 5.4 for example

connection of SD02B to microcontroller through UART interface.

f. Power indicator LED on SD02B will turn ON when power is supply to microcontroller

board.

g. Please refer to 18F4520-dual uart sample.c for details on method to send/receive

command to SD02B.

h. User must install MPLAB and C18 Compiler if user wants to modify and compile this

sample program. The free MPLAB and C18 Compiler for PIC18 MCU can be obtained

from Microchip official website.