130-28029 Parallax Inc, 130-28029 Datasheet - Page 132
130-28029
Manufacturer Part Number
130-28029
Description
KIT PARTS SMART SENSORS
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 130-28029
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp®
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Page 120 · Smart Sensors and Applications
trigonometry identities, it turns out that the angle θ is the arctangent of −y/x. So in
addition to accelerometer rotation, the compass module's angle from north is another
value that can be determined using the PBASIC
ACTIVITY #1: CONNECTING AND TESTING THE COMPASS MODULE
In this activity, you will connect the compass module to the BASIC Stamp and run a test
program. This will verify that the electrical connections are correct and the module is in
working order.
Connecting the Compass Module
The Hitachi HM55B Compass module needs connections to Vdd and Vss (power and
ground) and three communication line connections to the BASIC Stamp.
Parts Required
(1) Hitachi HM55B Compass Module
(6) Jumper wires
There are no external resistors or capacitors required; they are all built onto the module.
Figure 4-2
Compass Module Sensing Axes
tan
tan
θ
=
tan
−
θ
ATN
1
=
(
tan
−
−
N
1
operator.
N
⎛ −
⎜ ⎜
⎝
θ
cos
sin
x
)
y
=
⎞
⎟ ⎟
⎠
θ
tan
θ
=
−
−
1
x
y
⎛ −
⎜ ⎜
⎝
x
y
⎞
⎟ ⎟
⎠
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