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 | | Re: Logic level conversion
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| To convert from 0-3 to 0-5 I would suspect that all you need is a 2N2222 NPN transistor with a couple of resistors to bias it. For example: +5volts 100 ohm resistor collector ---...---0-5 input 0-3v output -----1k resistor ----- base emitter 0volts (...) (26 years ago, 30-Nov-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.741)
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| | Re: Extra output for clocking
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| Hugo Robertson: One of the nice things about the 68HC11 chip is its well rounded timming system. Grab your Handy board Technical reference manual and have a look at page 48. PA0-3 are "Input Capture" pins. When the logic level changes (according to (...) (26 years ago, 30-Nov-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.741)
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| | Re: Two way audio -Reply
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| A couple of years ago I built a small FM transmitter that had a small microphone on it. I could hear whispers in the room next door when I turned it on and tuned in a small transister radio to its frequency. This may be an option. Mike (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.740)
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frequency
(score: 1.740)
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frequency
(score: 1.739)
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frequency
(score: 1.739)
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| | CyberMaster communications
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| (...) Humm.. in fact having two units using completely different mediums of communication (IR/Radio) might be an advantage in some cases because communications with the computer never mix. By the way, has anybody ever tried changing a bit the radio (...) (26 years ago, 14-Dec-98, to lugnet.robotics)
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frequency
(score: 1.738)
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| | RE: PipeXplorer
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| If your desiring greater distance - go get a Amature Radio license. In the US there are several sections of frequency bands that are for experimental use, and even RC (radio control). A reasonable knowledge of electronics and some fairly easy study (...) (26 years ago, 24-Dec-98, to lugnet.robotics)
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frequency
(score: 1.737)
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frequency
(score: 1.732)
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| | RC control
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| I currently own a Legomindstorms that I'm incorporating with the Lego RC cars. I took the car apart and altered the control board so that it can control two motors. This would allow a radio controlled robot to have full movement through the RC and (...) (26 years ago, 29-Jan-99, to lugnet.robotics)
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frequency
(score: 1.731)
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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: 1.730)
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| | Talking robot
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| Has anyone toyed with the idea of having your robot talk? I've thought about trying to convert a wave file from pulse code modulation to frequency modulation and try to get it to play on the RCX but I don't think that there will be enough resolution (...) (26 years ago, 30-Jan-99, to lugnet.robotics)
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frequency
(score: 1.730)
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| | Re: NQC - ASM command
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| (...) asm allows you to put literal RCX bytecodes in your program. Most of the 'functions' in NQC are actually just macros that expand to asm statements in rcx.nqh. (...) To my knowledge, you can't to either of these from rcx bytecodes. Sound is (...) (26 years ago, 2-Feb-99, to lugnet.robotics)
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frequency
(score: 1.729)
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| | Re: electronics question please help
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| The modulation frequency of the IR diodes must match the sensor (depending on exact part number, around 38 KHz) within +/- 3 KHz. As you move away from the center frequency, detection drops off sharply. Are you able to confirm the modulation (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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frequency
(score: 1.729)
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| | Decoding Infrared receiver
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| Dear Mr Fred Martin/Friends, I have been playing with the handyboard for a while now, currently I have four handyboards. I'm working on the communication module between the handyboards using the infrared emitter and the Sharp IS1U60 infrared (...) (26 years ago, 2-Feb-99, to lugnet.robotics.handyboard)
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frequency
(score: 1.729)
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| | Re: R4 Resistor
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| where is this list that says 2.94K? please tell me so i can eradicate the incorrect value. to answer, yes, just use it, it affects the IR xmit frequency and nothing else. fred In your message you said: (...) (26 years ago, 4-Feb-99, to lugnet.robotics.handyboard)
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frequency
(score: 1.729)
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| | Motor outputs
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| Dear all, I asked this question before but I might have used the wrong wordings. Here I try again. As you all know, the HB 's motor outputs give PVM, however, it gave me problems when I tried to amplify the power (both current and voltage.) Is there (...) (26 years ago, 2-Feb-99, to lugnet.robotics.handyboard)
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frequency
(score: 1.729)
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| | Angles and Diagonal Lines (was: Re: Angle Sensor)
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| (...) I run a plotter with two lightly loaded 'old' 9v motors. At power level 4, the angle sensors dropped readings. I geared the sensors down 3:1, and they seem to work fine now. The newer 9v motors are slower - your results may vary. (BTW: the (...) (26 years ago, 5-Feb-99, to lugnet.robotics)
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frequency
(score: 1.728)
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| | Re: Mindstorms in 1999
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| (...) I disagree. Internationalizing PC software is way easier than internationalizing embedded software with its inherent space constraints. To provide Suaheli software for RCX control is just to include another string table and set of (...) (26 years ago, 11-Feb-99, to lugnet.robotics)
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frequency
(score: 1.727)
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| | Re: National Engineers Week
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| (...) Concern. I think the frequency is high but Richard is SO enthusiastic, I would not want to say anything that might derail that enthusiasm. He's a great ambassador for the brick. (26 years ago, 24-Feb-99, to lugnet.admin.general)
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frequency
(score: 1.727)
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