28029 Parallax Inc, 28029 Datasheet - Page 139
28029
Manufacturer Part Number
28029
Description
KIT PARTS SMART SENSORS W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
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
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You can also hold the bar magnet at the same level with the compass module, directly in
front of it, as shown in Figure 4-6a. This time the poles magnet's poles are lined up with
north and south instead of the opposite.
Figure 4-6: Finding the Safe Distance Limits
a.
The bar magnet in a mechanical compass will have a similar effect. It's not a very strong
magnet, so there probably won't be a problem with getting it too close to the compass
√
√
With the bar magnet oriented in Position 1 as shown in Figure 4-6b and your
board oriented to north, find a distance that causes an x measurement of 120.
Start from 1 m away again.
Next, try placing the bar magnet in positions 2 through 6. Can you use the
Debug Terminal to determine where the bar magnet is?
Measurements between 127 and 300
Remember that the
magnet close enough to the compass module so that it causes measurements above 127,
you will need to scale the measurements down before using the
scaling procedure introduced in Chapter 3, Activity #3 will work well for this.
ATN
command inputs can range from −127 to 127. If you hold the bar
Chapter 4: Hitachi HM55B Compass Module · Page 127
b.
ATN
command. The
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