27220 Parallax Inc, 27220 Datasheet - Page 161

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

Program: SW21-EX27-Stepper_Control.BS2
' {$STAMP BS2}
' {$PBASIC 2.5}
' -----[ Program Description ]---------------------------------------------
'
' This program demonstrates simple stepper motor control. A potentiometer
' allows for speed and direction control.
' program will work with unipolar and bipolar stepper motors.
' -----[ I/O Definitions ]-------------------------------------------------
PotCW
PotCCW
Coils
' -----[ Constants ]-------------------------------------------------------
Scale
Mitsumi
Howard
RevSteps
NumSteps
LastStep
#DEFINE Testing = 0
' -----[ Variables ]-------------------------------------------------------
idx
stpIdx
stpDelay
rcRt
rcLf
diff
' -----[ EEPROM Data ]-----------------------------------------------------
'
'
'
Step1
Step2
PIN
PIN
VAR
CON
CON
CON
CON
CON
CON
VAR
VAR
VAR
VAR
VAR
VAR
DATA
DATA
0
1
OUTB
$100
48
100
Mitsumi
4
NumSteps - 1
Byte
Nib
Byte
Word
Word
Word
-----
%1100
%0110
ABAB
__
Using the L293D driver, this
' clockwise pot input
' counter-cw pot input
' output to stepper coils
' to scale RCTIME
' steps/rev by type
' steps per revolution
' use 4-step sequence
' last step in sequence
' 1 for POT testing
' loop counter
' step pointer
' delay for speed control
' rc reading - right
' rc reading - left
' difference in readings