Subject:
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Re: Help me convert this train program to use events (NQC)
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 28 Nov 2005 18:59:11 GMT
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Viewed:
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6559 times
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In lugnet.robotics.rcx.nqc, Brian Davis wrote:
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In lugnet.robotics.rcx.nqc, Jordan Bradford wrote:
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I don’t have enough cords to reach the touch sensors...
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Speaker wire and small alligator clips will make a dandy
solution for extending the basic wires...
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I wanted the layout to be pure LEGO...
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For future, LEGO’s educational division does sell 3m LEGO wires.
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Wow! That’s quite a long cable. Is this the right product? I only found it using
Pitsco’s search box; it’s not listed in any LEGO section as far as I could tell.
http://www.legoeducation.com/store/detail.aspx?ID=1060
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I have seen the batteries run down very quickly.
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A 1.0 RCX that allows you to power the setup from an outlet is ideal for
this. If it ends up being battery-based, you will have to adjust the power
level as the batteries drain (probably with finer control than just the 8
power levels the RCX usually allows - but there’s ways around this). This to
could be automated, however - record the station-to-station time for the first
complete run, for instance, and if the station-to-station time interval is
ever “too long”, have the software readjust the output power.
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My original setup’s RCX is a 1.0 with the AC adapter. The rails are powered by
the regulator; the RCX just changes their polarity.
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I was wondering about that monitor block and whether it would only execute
once. Should I put the monitor block inside a while(true) ?
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Yes. I cobbled up an (untested!) version of your program using events
(before you decided to go over to touch sensors again). This assumes an
on-train RCX with an on-train light sensoer looking down:
#define eye SENSOR-1
#define train OUT-A
#define STATION-EVT 0
task main()
SetSensor(eye, SENSORLIGHT);
SetEvent(STATIONEVT, eye, EVENTTYPEHIGH);
SetPower(train, OUTHALF);
while(true)
monitor(EVENTMASK(STATIONEVT))
Wait(32767);
catch
Float(train);
Wait(100);
Toggle(train);
On(train);
Wait(500);
Note that the final “Wait(500)” is so that the train will have time after
reversing to clear the station again - otherwise, the monitor() command will
trip out again as the train reverses over the station.
Use events in this application - it’s a nice one to learn on, and if you
are using the standard firmware events are wonderful things to use - the make
coding easier and much faster. And for touch sensors there are
EVENTTYPEPRESSED or EVENTTYPERELEASED types that are defined as well.
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Yep, I forgot that second wait(). My code was untested, remember. :)
The reason I asked about that monitor block is that I’m used to C#/Java
applications where you set up event handlers and the environment is event-driven
to begin with; you don’t need explicit idling loops that just wait for something
to happen. NQC seems similar to OpenGL/GLUT, then, since you set up event
callback functions and then enter an event loop using glutMainLoop() or
something like that.
Hmmm, maybe I’ll try a Java version next.
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