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 | | Re: Herring
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| (...) Probably. OTOH, I realized that if I had been posting on lugnet since it started, in the same frequency I had been posting between Dec. 1999 and mid-July 2000, I'd have more posts than even you do. <gasp> -Shiri (lucky fifth blabbermouth) (24 years ago, 2-Jan-01, to lugnet.off-topic.fun)
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frequency
(score: 1.981)
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| | Re: Alternate IR Comm Setups
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| (...) Dustin, I believe that the built-in IR in a laptop uses a different carrier frequency than the 38KHz used by the RCX 1.0. I've seen reports here that the 2.0 RCX can be reconfigured (with some low-level system programming) to use a 76KHz (...) (21 years ago, 12-Nov-03, to lugnet.robotics)
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frequency
(score: 1.981)
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| | Re: Ultrasonic sensor interactions
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| (...) The device operates at 40kHz, the transmit and receive piezo devices are only resonant at that frequency. Even though the measurement period is short (time from transmit to time to receive) it is necessary to wait quite a while for the sound (...) (18 years ago, 21-May-06, to lugnet.robotics)
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frequency
(score: 1.981)
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| | Re: Microphone and Heat Sensors
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| (...) Interesting sounding project Melissa. The trick is to distinguish the doorbell from other ambient sounds heard picked up by the microphone. One approach might be to use the LM567 PLL Frequency Detector. Its a relatively simple little 8 pin IC (...) (27 years ago, 12-Nov-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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| | Re: H-Bridge
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| Hi talking about the H-Bridge.....we are building one here for a 1.5 kW motor with maximal power output of 2.2 kW. This one works with 400V but is also developped for a current of a little more than 10 A (actually 15A). It will be chopped with a (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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| | Re: IR transmission
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| Jeff, You are right. Several things could be wrong here. First of all the precision resistor is VERY VERY important. This controls the frequency of the carrier signal. The freq is approx 1/(RC) where R = R4 and C = C6 of the the Handyboard IR Tx (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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| | 8 Wide Dual Engine Shed
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| I almost forgot-- here are a few shots of my engine shed. Please excuse the frequency of my posts-- that's what happens when you finally get a new digital camera;-) (URL) (24 years ago, 10-Apr-00, to lugnet.trains) !
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frequency
(score: 1.981)
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| | Re: 6.8nF Capacitor
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| I don't suppose you know what the formula is for calculating the value of the frequency ?. 1/(R4*C6) possibly ?. This equation gives 38396Hz (38.4KHz) which means that my 6.6nF caps give 39560Hz (39.6KHz) which is closer to 40KHz than the 6.8nF (...) (24 years ago, 12-Jul-00, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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frequency
(score: 1.981)
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| | Re: OT: Math Help
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| (...) One of the things I did pickup from "my" answer is you need to have a sample frequency small enough that you are not going to get wind direction changes of 180 degrees or more. And I say or more, because it's important to the average which (...) (19 years ago, 5-Aug-05, to lugnet.org.ca.rtltoronto)
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frequency
(score: 1.981)
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| | Looking for VisionCenter Examples
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| I will be developing a program that distills a real time image into a aesthetic number using frequency & spatial filtering, quantitative, morphology and pattern matching through the VisionCenter. My reference work will be to use known masterpieces (...) (17 years ago, 25-Nov-07, to lugnet.robotics.vc)
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frequency
(score: 1.981)
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| | Re: IR Sensitivity - Was: 1.5/2.0 infrared problem
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| (...) Hello Mark, Thanks for your answer, this will keep me from dismantling once again my RCXs ! So it seems that LEGO modified RCX2.0 to get better compatibility with Spybots/Manas. Now a question remains, why did they increased carrier frequency (...) (21 years ago, 23-Oct-03, to lugnet.robotics.rcx)
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frequency
(score: 1.981)
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frequency
(score: 1.981)
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frequency
(score: 1.981)
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| | Re: Technic beam colours
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| Perhaps my order might be : Blue, White, Green, Grey, Red, Black, Yellow, Others. (Availability and set frequency probably influences this!) Interesting are the combinations used. The almost edible red/yellow in 8872, the cool blue/white in 8042 (...) (23 years ago, 2-Oct-01, to lugnet.technic)
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frequency
(score: 1.981)
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| | Re: RCX Ultrasonic Sensor
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| Hi I've checked out the circuits online, but they all make use of a PIC to generate the frequency. I don't have access to PICs so im looking for an alternative. Also, I checked out about your kits and unfortunately no-one stocks that sort of stuff (...) (22 years ago, 20-Mar-03, to lugnet.robotics.rcx)
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frequency
(score: 1.981)
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| | Re: IR Subsystem confusions.
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| (...) The handyboard consists of an IR transmitter and detector circuits. The purpose of the transmitter (when connected thru the infrared LED) is to produce infrared light waves at particular frequencies. This frequency is controlled by R4 and C6 (...) (28 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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| | Re: tracking an IR beacon
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| (...) I confirm what David is saying! Once i worked on some kind of beacon using an PLL to find its frequency (we used a lm567) and it couldn't work properly due to the response time of the PLL. An alternate solution was to replace the PLL by a (...) (27 years ago, 7-Dec-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.981)
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| | Re: What do other parents do with Lego guns?
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| (...) I think part of the reason that no such lobby exists is because the frequency of bleach-related violence is very low, and almost no one robs a convenience store with a bottle of soap. Of course you're correct, though; the incidence of (...) (24 years ago, 26-Jun-00, to lugnet.off-topic.debate)
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frequency
(score: 1.981)
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| | My over-simplification of the anti-war movement
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| I don’t have the chance to respond with the same level of frequency here on OTD as many of the regulars, so this may sound like a hit and run, as I will voice my opinion and probably not respond to rebuttals in a timely fashion. I, however, desired (...) (22 years ago, 31-Mar-03, to lugnet.off-topic.debate)
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(score: 1.981)
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