Subject:
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To all sensor developers, why use voltage drive ?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Fri, 2 Mar 2001 22:18:30 GMT
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Viewed:
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1440 times
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Hi,
Why is everyone using a voltage driven cirquit when devolping a RCX sensor-cirquit, while the RCX sense input is in fact a current sensing input ?
Ok, I admit, until short I also copied the schematic everyone is using.
But I now think the current drive cirquit has a number of significant advantages and I can't find any disadvantages (ok 1 transistor more)
1: it's far more linear
2: it uses less power
3: diode-drop has no effect
schematics and measured curves can be seen on
http://baserv.uci.kun.nl/~smientki/Lego_Knex/Lego_electronica/Designing_sensors.htm
By the way, why can't I put a link in this message, the server won't accept it ?
Stef Mientki
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