Subject:
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Re: Use RCX motor output to switch devices
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 31 Aug 2002 03:52:10 GMT
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Viewed:
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1047 times
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In lugnet.robotics, Remko Roodselaar writes:
> In lugnet.robotics, Don Wilcher writes:
> > In my "LEGO Mindstorms Interfacing" book published by McGraw-Hill I devote
> > whole chapter (Chapter 4) on Electronic Switching techniques. I describe
> > both input/output switching techiques using npn and Power MOSFET transistors
> > to control RCX and Scout based robots. The book will be on the bookshelves
> > next month. Here is a link from Amazon.com about the book. Enjoy!!!
> >
> > http://www.amazon.com/exec/obidos/ASIN/0071402055/qid%3D1030573125/sr%3D11-1/ref%3Dsr%5F11%5F1/002-8245441-6243259
>
> The question is then, Don: does your book tackle the switching of different
> circuits with the RCX motor outputs?
>
> Thanks,
> Remko
Remko,
Starting on page 144, I start the topic discussion on Electronic Output
Switching by describing a detail lab project of an Audible Tone Generator.
The core switching circuit consists of using a 7805 Voltage Regulator IC
driving a 2 transistor audio oscillator circuit. The 7805 IC was used as a
way of taking the output voltage (7-8VDC) of the RCX and stepping it down to
a regulated +5VDC. This low voltage rail powers the audio oscillator using
low current draw and power dissipation from the RCX P-Brick's output. On
page 150, I discuss creating a Digital Control Unit Diagnostics Tool Lab
procedure. The driving element in this project is a Power MOSFET switching a
seven segment LED display. Again, the 7805 voltage regulator IC is used as a
voltage isolator/step down converter for the Diagnostics Tool Lab project.
Check it out in the LEGO Mindstorms Interfacing book. Go buy the book and
you'll be glad that you did.:)
Regards
Don Wilcher
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