Subject:
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Compass sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 31 Mar 2000 21:01:26 GMT
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Original-From:
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Simon Bogaert <simon.bogaert@advalvas.SPAMLESSbe>
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Viewed:
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1764 times
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Hello everybody,
I want to build a compass sensor. I already have an electric diagram for
the sensor itself, but there are some problems.
I have already studied the Light sensor diagram at Mr. Gasperi's website,
but I don't quite how the sensor readings are passed to the RCX. Here's what
I understood:
|-------------------------------|
| |------------------------| |
D D |---|----- |---------- | |
1 °-----|---)---| | | | |
| D D C S |
| D D | | |
2 °---------|---)---| | | |
|---|------|----------|---|
1 and 2 are the exits to the RCX. D is a diode. The four diodes at the
front of the diagram are a rectifier bridge (In parallel with capacitor C).
S stands for Sensor; something such as an adjustable resistor. The value of
the resistor is then passed through to the RCX via the two upper diodes.
What I don't understand, is how the measurement can be passed if the diodes
block the signal. Is there anybody out there that can help me?
Second: the RCX only delivers 4.99 V (independant of the power your
batteries deliver), while I need 6 ... 18 V for the sensor. Would it be
enough to put a battery (stabilised or not) in the circuit?
Please help ...
Simon
PS: Is there anybody out there that has built a gyroscopic sensor, because,
the compass sensor needs to be perfectly horizontal, and i need a qyro
sensor to make it do so.
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Message has 3 Replies:
 | | Re: Compass sensor
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| (URL) Bogaert <lego-robotics@crynwr.com> wrote in message news:000501bf9b55$18...c2@sibo... (...) diodes (...) You need to look at the general purpose interfaces: (URL) second one is for a real powered sensor like you need. The diodes D1 to D4 (...) (25 years ago, 1-Apr-00, to lugnet.robotics)
| | | Re: Compass sensor
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| Simon Bogaert wrote in message <000501bf9b55$187354...2@sibo>... (...) Check out Precision Navigation (URL) They make the Vector 2X digital compass. They have a single plane version, a multiaxis gimballed version as well as the $$$ non-mechanical (...) (25 years ago, 1-Apr-00, to lugnet.robotics)
| | | Re: Compass sensor
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| (...) Actually - placing a gyroscope inside two gimbals (structure which pivots in a single plane) with a couple rotation sensors will provide the needed information. It would use two inputs - perhaps a drawback. Another alternative would be to (...) (25 years ago, 2-Apr-00, to lugnet.robotics)
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