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In lugnet.robotics, Michael Riches mriches@u.washington.edu wrote:
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Dear List,
I am without an IR tower for my Mindtsorms kit. I have built two of the
schematics here:
http://oase.uci.kun.nl/~mientki/LegoKnex/Legoelectronica/IRtower/IRtower.htm#Hardwire%20IR-signals%20to%20RCX
Neither of the ones I tried work. I tried the one by John Barnes, and the
hardwire cable. I do not know enough about schematics to read the OEM
design. Has anyone built either of these two cables?
-Mike Riches
mriches@u.washington.edu
206-228-2002
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Try this schematic, which is my interpretation of the RS232 IR tower supplied
with the RCX: http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1071591
Apart from the IR receiver device itself, getting hold of suitable components
shouldn’t be difficult. Most of the transistors are general purpose small
signal ones, the output one being higher powered (1A peak rating?), so
alternatives are plentiful. If you don’t build in surface mount, use two 1N4148
diodes for each of the diode packages. The zener is a 4.7V one.
If you can’t get the receiver device, make a circuit with an opto-transistor and
amplify the signal to 4.7 volts with that supply, perhaps using LM358 op-amps as
they are single supply ones.
Mark
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