Subject:
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Sending Commands to Spybot from RCX - Question from a Beginner to Comm area.
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Newsgroups:
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lugnet.robotics.spybotics
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Date:
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Fri, 28 Jan 2005 14:39:27 GMT
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Viewed:
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7913 times
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Hi All,
I am planning to send some commands to spybot via RCX 2.0 unit. My Whole plan is
control “spybot” using RCX unit.
To have a basic understanding of the communication, I used the sample posted my
Mark Riley 19 Aug 2002.
In RCX I used
SetSerialData(0,0x92);
SetSerialData(1,0x23);
SendSerial(0,2);
SetSerialData(0,0x92);
SetSerialData(1,0xab);
SendSerial(0,2);
When it opens and closes the door of my Security Valut.
Then in spybot I used following code.
event MessageEvent when message
watcher MessageHandler monitor MessageEvent
{
select message[ iRxIR, iHiByte ] * 256 + message[ iRxIR, iLoByte ]
{
// RCX sent 0x9223 (controller red button)
when 0x0200 { sound sndShocked Disp(ledSparkle) }
// RCX sent 0x92ab
when 0x0103 { sound sndHitByLaser Disp(ledAlarm) }
}
}
It works perfectly. I do see the animations as I expected.
Now I have couple of questions for you all.
1. When I send 0x9223 from RCX unit why spybot checking for 0x0200? (This may
be very primitive question. But I don’t know). Actually I want to know the
relationship of sending data and receiving data and a complete understanding of
“How RCX Communications Work?”. An URL will be alright.
2. Then I tried to use “SetSpybotMessage” and “SendSpybotMsg” posted by John
Hanson couple of days ago. I am pretty sure message will get delivered to
spybot, but it doesn’t do any thing. Code that I used in RCX is as follows.
SetSpybotMessage(MSG_BROADCAST, ID_BOT_MIN+1, 0, CMD_FIRE_LASER, 1, 100);
repeat(2)
{
SendSpybotMsg();
Wait(100);
}
I didn’t change my spybot code to capture any additional messages. Do I have to
check for any value at the spybot code or not? If I have to, how can I derive it
using SetSpybotMessage parameters? Here are the values for each constant.
MSG_BROADCAST = Ox8a, ID_BOT_MIN+1 = 9, CMD_FIRE_LASER = 0x21
I may have to change my code (using NQC) as follows.
if (RxMessage(MSG_IR, MSG_COMMAND) == COMMAND_CONTROLLER)
{
x = RxMessage(MSG_IR, MSG_HI_BYTE);
}
But I am not quite sure about the constatnts (like COMMAND_CONTROLLER) that I
sould be checking.
Thanks in Advance,
Alex Jayasundara
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