Subject:
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Digital & Analog Compasses
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 8 Jan 2000 19:12:27 GMT
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Original-From:
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Rossz Vamos-Wentworth <rossw@jps./Spamcake/net>
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Viewed:
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589 times
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Here's some information on a few compasses that could be
implemented as RIS sensors. The original web page is at:
http://dinsmoregroup.com/dico/
1490 Digital Compass Sensor ($12.00)
This sensor provides eight directions of heading information by
measuring the earth's magnetic field using hall-effect technology.
The 1490 sensor is internally designed to respond to directional
change similar to a liquid filled compass. It will return to the
indicated direction from a 90 degree displacement in approximately
2.5 seconds with no overswing. The 1490 can operate tilted up to
12 degrees with acceptable error. It is easily interfaced to digital
circuitry and microprocessors using only pull-up resistors.
Specifications:
Power 5-18 volts DC @ 30 ma
Outputs Open collector NPN, sink 25 ma per direction
Weight 2.25 grams
Size 12.7 mm diameter, 16 mm tall
Pins 3 pins on 4 sides on .050 centers
Temp -20 to +85 degrees C
1525 Analog Compass Sensor ($35.00)
This sensor provides a ratiometric output on two channels. The
outputs swing from 2.9v to 2.1v in a sine/cosine fashion. It will
return to the indicated direction from a 90 degree displacement in
approximately 2.5 seconds with no overswing.
Specifications:
Power 5-volts DC @ 19 ma. Since rise time is only 90
nanoseconds, input current may be pulsed to save power.
Outputs Dual analog channels, 2.5v ± 0.4v swing (total voltage
swing rail to rail, aprox. .75v), 4ma DC signal. May feed direct to A-
D front end of microprocessor.
Weight 2.25 grams
Size 12.7 mm diameter, 16 mm tall
Pins 3 pins on 2 sides on .050 centers
Temp -20 to +85 degrees C
1655 Analog Compass Sensor ($35.00)
This sensor provides a ratiometric output on two channels. The
outputs swing from 2.9v to 2.1v in a sine/cosine fashion. It will
return to the indicated direction from a 90 degree displacement in
approximately 2.5 seconds with no overswing.
Specifications:
Power 5-volts DC @ 19 ma. Since rise time is only 90
nanoseconds, input current may be pulsed to save power.
Outputs Dual analog channels, 2.5v ± 0.75v swing (total voltage
swing rail to rail, aprox. 1.50v), 4ma DC signal. May feed direct to
A-D front end of microprocessor.
Weight 2.25 grams
Size 12.7 mm diameter, 16 mm tall
Pins 3 pins on 2 sides on .050 centers
Temp -20 to +85 degrees C
Note: The specs of this sensor are identical to the 1525 except
that the total voltage swing is larger
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