28029 Parallax Inc, 28029 Datasheet - Page 144

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28029

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® or Javelin Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 28029PAR

Page 132 · Smart Sensors and Applications
Example Program - CalibrateCompass.bs2
' -----[ Title ]--------------------------------------------------------------
' Smart Sensors and Applications - CalibrateCompass.bs2
' This program collects and stores Hitachi HM55B Compass Module measurements
' in EEPROM for axis offset and linear interpolation corrections that will be
' performed by TestCalibratedCompass.bs2.
'
' {$STAMP BS2}
' {$PBASIC 2.5}
'
' IMPORTANT: Follow the instructions in Chapter #4, Activity #2 of
'
'
'
' -----[ EEPROM Data ]--------------------------------------------------------
CompassOffsets DATA @ 0, (4)
CompassLowVal
CompassCal
' -----[ Pin Definitions ]---------------------------------------------------
DinDout
Clk
En
' -----[ Constants ]----------------------------------------------------------
Reset
Measure
Report
Ready
NegMask
Current
Previous
' -----[ Variables ]----------------------------------------------------------
x
y
status
angle
counter
index
character
Free Download! This program is available as a free .bs2 file download from the Smart
Sensors and Applications Product Page at www.parallax.com. If you would like to know how
this program works, read through the comments here.
Smart Sensors and Applications.
download from the Smart Sensors and Applications page at
www.parallax.com.
DATA
DATA
PIN
PIN
PIN
CON
CON
CON
CON
CON
CON
CON
VAR
VAR
VAR
VAR
VAR
VAR
VAR
2
0
1
%0000
%1000
%1100
%1100
%1111100000000000
0
1
Word
Word
Nib
Word
Byte
Nib
Byte
(1)
(16)
' Stores x and y axis offsets
' Stores index of lowest angle
' 16 reference compass angles
' P2 transceives to/from Din/Dout
' P0 sends pulses to HM55B's Clk
' P1 controls HM55B's /EN(ABLE)
' Reset command for HM55B
' Start measurement command
' Get status/axis values command
' 11 -> Done, 00 -> no errors
' For 11-bit negative to 16-bits
' Index for table array
' Index for table array
' x-axis data
' y-axis data
' Status flags
' Angle measurement
' Loop counter
' EEPROM index
' Stores a DEBUGIN character
It's available for