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 | | Re: Range of RCX sound production
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| Hi Brian, I find your question very interesting. I do not have an audio analyzer, but I have a few ideas so you can extend your hunt. I'm told that you can get software that lets you use your sound card as an oscilliscope. All you need is a (...) (20 years ago, 18-Aug-04, to lugnet.robotics)
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frequency
(score: 1.982)
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| | Re: Assembling the HandyBoard
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| (...) You need that resistor to stabilize the crystal frequency. Try Radio Shack if it is missing from the kit. It doesn't have to be 1/8 watt, 1/4 or 1/2 watt is fine, just make sure it is 2.2 megaohm. (...) So far so good. (...) There is probably (...) (28 years ago, 26-Dec-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.982)
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| | Re: Homebrew sensors?
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| (...) I was thinking of something that sensed amplitude, not frequency. (Like the light sensor, which sees brightness, not color.) Of course, whatever you want for yourself is best. :) I know the logic of taking two sensors and differentiating to (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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frequency
(score: 1.982)
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| | Re: Decoding Infrared receiver
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| Make sure that your modulating the transmision part with the correct frequency! When I built my handy board I tested the IR TX circuit and it gave me 57kHz instead of 40 kHz and I did use all the correct resistor capacitor values. I suggest that you (...) (26 years ago, 3-Feb-99, to lugnet.robotics.handyboard)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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| | Re: ir tower -> consumer electronics
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| (...) It's because of the hertz or frequency of the Mindstorms receiver. It can't quite pick up up right and there for causes errors. It also can't send out what it received because it didn't catch the entire system... It's the same reason we can't (...) (24 years ago, 27-Apr-00, to lugnet.robotics)
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frequency
(score: 1.982)
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| | Re: I am officially curious...
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| (...) Strangely enough, my frequency went *up* after we switched to verification. That was not, however, the reason why. My posting is back down in the last few months, however, because I've been totally buried under work. LFB (23 years ago, 8-Dec-01, to lugnet.general)
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frequency
(score: 1.982)
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| | Re: Ultrasonic sensor interactions
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| (...) Wow! That's a lot lower than I'd have expected - at that frequency there is a good risk of harmonics from normal sound interfering with it. (...) Right - 350 meters per second is pretty slow by computer standards. (...) (Not to mention things (...) (18 years ago, 21-May-06, to lugnet.robotics)
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frequency
(score: 1.982)
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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: 1.982)
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| | RE: IR Demodulator Range Finder Hack
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| (...) Sure thing. The basic wiring for a 555 in astable mode is pretty straightforward; +5 volts |-----+ +-|-----|-+ +-Res.1-------| 8 4 | | | | |---...---| 7 3 |------> to Base of BJ Transistor Res. 2 | | | +----| 6 "555" | | | | | +--------+----| (...) (27 years ago, 26-Nov-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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| | Re: SMASH up DERBY!!! date set
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| -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 From: "Chris Magno" <cmagno@rogers.com> Sent: Sunday, February 09, 2003 10:20 PM Subject: Re: SMASH up DERBY!!! date set (...) snip Dilithium crystals? 27mhz is a standard frequency for hobby stuff. (...) (22 years ago, 10-Feb-03, to lugnet.org.ca.rtltoronto)
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frequency
(score: 1.982)
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| | Re: some more questions about lnp.
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| duh... guess i was kinda wrong here.. IR is in reality a frequency defined from A to B. any messages sent within this spectre is said to be IR messages. so in theory sending an IR message closer to A than B from one RCX. and at the same time sending (...) (22 years ago, 28-Sep-02, to lugnet.robotics.rcx.legos)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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| | Re: RC Car question
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| (...) Someone on RTL sez that they all use the same frequency. :( It's possible though that there are several standard frequencies, and it was just bad luck that the ones tested were the same. (26 years ago, 25-Oct-98, to lugnet.general)
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frequency
(score: 1.982)
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| | Firmware: IR transmission demystified
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| IR transmission was pretty tough to get at. Carrier frequency was the final key - there are no crystals to create the IR carrier, so the processor has to provide it. It turns out that 8-bit t1 output is used for just that purpose. Guess I'll have to (...) (26 years ago, 9-Nov-98, to lugnet.robotics)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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frequency
(score: 1.982)
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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: 1.982)
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