Subject:
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Re: Compass sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 1 Apr 2000 12:17:28 GMT
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Highlighted:
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(details)
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http://www.plazaearth.com/usr/gasperi/gpa.htm
Simon Bogaert <lego-robotics@crynwr.com> wrote in message
news:000501bf9b55$18735400$45ce0ac2@sibo...
> Hello everybody,
>
> 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?
You need to look at the general purpose interfaces:
http://www.plazaearth.com/usr/gasperi/gpa.htm
The second one is for a real powered sensor like you need. The diodes D1 to
D4 charge up the capacitor to between 5 and 7 volts depending on the
condition of the batteries. The diodes D5 and D6 are oriented the same as
the diodes that give you the + supply and let the RCX pull up on R1 when it
goes to read the sensor.
>
> 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?
The voltage you get with a powered interface will probably work provided the
sensor doesn't want too much current. You might be able to replace the
Opamp in the circuit with your compass sensor.
Look around on my main page, I'm pretty sure others have built interfaces
for compass sensors.
http://www.plazaearth.com/usr/gasperi/lego.htm
Mike G.
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Message is in Reply To:
 | | Compass sensor
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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 (...) (25 years ago, 31-Mar-00, to lugnet.robotics)
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