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| I found the R/C racer on sale so I bought three. One for each of my sons and one for myself. I am hoping that the radios can be modified so that we can use them together. I opened the transmitter and I noticed there is a 27.145mhz crystal in there. (...) (25 years ago, 15-Nov-99, to lugnet.modelteam)
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frequency
(score: 1.680)
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| | Change frequency on R/C Racer (5600)
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| I found the R/C racer on sale so I bought three. One for each of my sons and one for myself. I am hoping that the radios can be modified so that we can use them together. I opened the transmitter and I noticed there is a 27.145mhz crystal in there. (...) (25 years ago, 15-Nov-99, to lugnet.general)
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frequency
(score: 1.680)
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frequency
(score: 1.680)
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post, frequency
(score: 1.677)
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| | Re: Use PC's IR port instead of IR tower?
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| The basic difference between PCs/PalmPilots/WinCE IR ports and the RCX is a different physical transmission/modulation protocol. In the PC etc case the commonly used format is described by the IrDa standard (www.irda.org) where seperate IR pulses (...) (25 years ago, 12-Nov-99, to lugnet.robotics.rcx)
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frequency
(score: 1.677)
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| | Built-in IR
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| The problem with programming the built-in IR in the Palm is that one needs to access and control the hardware directly. You can't use the normal programming interfaces for controlling the IR. This requires an in-depth knowledge of IR protocol and (...) (25 years ago, 12-Nov-99, to lugnet.robotics.palm)
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frequency
(score: 1.677)
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| | Play tones with legOS !
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| Because dsound_play currently doesn't work for me, and because i wanted to make some noise under legOS with little memory and CPU footprint, i wrote a little function that plays arbitrary tones without using interrupts. I allows to play any (...) (25 years ago, 29-Nov-99, to lugnet.robotics.rcx.legos)
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frequency
(score: 1.676)
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| | Re: Built-in IR
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| Robert, you don't need to set the frequency. Just set the baud rate to a high frequency. Like 76K. Then try the things we talked about via email. MIke Robert Eddings <webmake@bellsouth.net> wrote in message news:38484B10.636C8C...uth.net... (...) (25 years ago, 4-Dec-99, to lugnet.robotics.palm)
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frequency
(score: 1.676)
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| | RE: IR tower question
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| I stripped my IR tower few days ago and draw a partial schematics out of it. TX side. There are two IR diodes connected series. Low power level feed is 100 ohm and high level is 5.6 ohms. Low range diode current is somewhere around 50 mA. I have not (...) (25 years ago, 18-Nov-99, to lugnet.robotics)
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frequency
(score: 1.676)
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| | RE: Laser Module for Mindstorms is Here!
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| I don't know what the frequency response for a cat eye looks like but most of these laser pointers will fry a human eye if directed into it without us realizing it. The main problem is that the frequency of the pointer is on the fringe of what we (...) (25 years ago, 30-Nov-99, to lugnet.robotics)
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frequency
(score: 1.676)
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| | Re: IR tower question
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| Robert, I hope an electronics person tells me I'm wrong, because this is where I'm stuck too. The serial port sets 2400 baud. But my understanding is that we have to get the Palm to generate a 38kHz signal. That is, pulse the IR led on/off at 38kHz. (...) (25 years ago, 18-Nov-99, to lugnet.robotics)
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frequency
(score: 1.676)
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| | legOS 0.2.2 dsound_play ?
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| hello again, has anybody got anything else than noise from legOS 0.2.2 dsound_play ? i'm able to compile and dll this little application: #include <dsound.h> #include "sample.h" int main(int argc, char *argv[]) { dsound_play(sample,s...(sample)); (...) (25 years ago, 25-Nov-99, to lugnet.robotics.rcx.legos)
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frequency
(score: 1.675)
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| | Re: Nice article in the Kansas City Star
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| Cool! Wish I got the paper on the weekdays. But since I moved from OP over to Lawrence I"ve not gotten it with any frequency and decided to can the KC star and get the Lawrence paper. Very neat, can't wait to see the picture. Tom Boucher Lawrence, (...) (25 years ago, 24-Nov-99, to lugnet.loc.us.mo.kan)
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frequency
(score: 1.675)
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| | Re: IR tower question
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| IrDA turns 'on' the IR for every 0 bit and holds it upfor ~ 1/2 of the period of the transmission frequency.(more on (URL) For these reasons its better to set the IrDA transmission frequency to 2x38kHz=76kHz and send 0x55 or other similar (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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frequency
(score: 1.674)
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| | RE: legOS 0.2.2 dsound_play ?
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| Ok, I see the problem, this won't play WAV files (assuming the description below is accurate). If a new bit to the speaker is only being generated at 8KHz then you cannot get useful speech out of it. What you need is to PWM to get various (...) (25 years ago, 29-Nov-99, to lugnet.robotics)
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frequency
(score: 1.674)
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| | Re: Memberships - so many people I don't know
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| (...) I didn't mean that to sound insulting -- sorry. (...) I thought of one other reason -- it has to do with name frequencies...see what you think about this theory: When scanning articles in newsgroups, there are usually a whole bunch of posts (...) (25 years ago, 28-Nov-99, to lugnet.people)
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frequency
(score: 1.674)
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frequency
(score: 1.674)
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| | Re: Built-in IR
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| Mike, I've done quite a bit of investigating and I can't find a way to change the Palm IR transmission frequency. The IR library is supposed to allow low level configuration of the IR port but I don't see any way to set the frequency. This seems (...) (25 years ago, 3-Dec-99, to lugnet.robotics.palm)
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frequency
(score: 1.674)
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| | Re: IR scanner
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| In reply to: (...) believe (...) A couple of quick points here: Your value of 96,720,000 ft/s, while accurate and sounds extreme should be considered in it's proper context. For the light to travel 1 foot, the object must be 6 inches away (6in there (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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frequency
(score: 1.674)
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| | Re: IR scanner
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| (...) Um. Your frequencies are out somewhere... There is a factor of ten 'slip' in the figures being used here. In fact your oscillator needs to be at ten times this frequency for a 1ft/Hz measurement. (the figure in the first line should be (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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frequency
(score: 1.673)
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