 | | IR Demodulator
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Hello Everyone, I have had absolutely no luck in getting a IR Demodulator for my HB. I have tried every source given on this sight and even more. Can anyone help me to locate this part? Sharp (IS1U60) Having No Luck! Bill Rose (28 years ago, 21-Jan-97, to lugnet.robotics.handyboard)
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| | Re: mosfet H-bridge
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I would also be interested in plans for such an H-Bridge. I have two 12Vdc motors than take 3.5 Amps at full load (actually gearhead motors so I get lots of torque @50 RPM) but they have surges us to 12 - 14 Amps at start-up and if they get stalled. (...) (28 years ago, 20-Jan-97, to lugnet.robotics.handyboard)
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| | RE: mosfet H-bridge [DAT]
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Sure, I've built several. The only "trick" to MOSFET bridges is that if you use all N-channel FETs you need a charge pump on the upper FETS. (look out for typos, this was done 'off the cuff' so to speak.) Chuck's Simple MOSFET Tutorial ---...--- (...) (28 years ago, 20-Jan-97, to lugnet.robotics.handyboard)
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| | mosfet H-bridge
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Hello, does anyone know how to build a mosfet hbrige and, if so, could they pass that on to me? It is my understanding that the mosfet hbridge does not heat up near as much as the transistor hbridge nor does it have any loss of voltage or current (...) (28 years ago, 20-Jan-97, to lugnet.robotics.handyboard)
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| | Re: Sensors
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(...) Voltage. (...) Yes. (28 years ago, 20-Jan-97, to lugnet.robotics.handyboard)
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| | More Sensors
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What is the smallest difference between voltages that the HB can differentiate between at its analogue inputs.I am very grateful for the information which has already been supplied in reponse to my queries and have found it useful though not (...) (28 years ago, 19-Jan-97, to lugnet.robotics.handyboard)
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| | Re: Robot Soccer Teams
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Perhaps someone can post it on their HomePage or something so that we all can read it. :) (...) (28 years ago, 19-Jan-97, to lugnet.robotics.handyboard)
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| | Twitchy servos
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Hi. I also have the problem of twitchy servos, but I am currently only using one of them. The servo is used in steering and it constantly twitches. Although, when I have nothing else hooked up to the board and have only the servo running, no twitch. (...) (28 years ago, 18-Jan-97, to lugnet.robotics.handyboard)
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| | Re: Ranging
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(...) The Polaroid sensor (50-60 KHz, 1.5-30 feet but maybe more from the air?) is $49 (minumum two) direct from Polaroid. They are in the FAQ or I can look up the ordering stuff if you are interested. There is plenty of documentation for using the (...) (28 years ago, 18-Jan-97, to lugnet.robotics.handyboard)
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| | Robot Soccer Teams
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I just read in Nuts & Volts about your triumph!! What an impressive feat! Doesn't it get boring having your robots beat the competition 15 to zip? Just kidding.. I can imagine the excitement you all must have felt to see your creation take off seem (...) (28 years ago, 18-Jan-97, to lugnet.robotics.handyboard)
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| | Re: dual servos
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Hi, Richard wrote: - but I just read yesterday on a web page that servos want a signal (20 ms = ?? degrees) every 50 milliseconds or so Right concept, wrong numbers. Servos want to see a pulse about once every 20ms. The pulse should be in the range (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | Sensors
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Would someone be able to tell me whether the analogue inputs on the HB are sensitive only to voltage or to current.I would also like to know whether or not I could recieve sensor input on more than one analogue input simultaneously and make the HB (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | RF communcations
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--text follows this line-- Check out the network section on (URL) the various options Thad Starner MIT Media Laboratory Wearable Computing Project (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | Re: (IR sensors)
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If you go to the following link: ftp://cher.media.mit.../cmcmanis/ You will find a file called ir.tar.Z which describes some software I wrote for a PIC chip that drove several LEDs and monitored three IR sensors (Sharp 1SU60s but could have as (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | dual servos unstable?
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(...) Try running the two-servo code, but unplugging each of the two servos, in turn. One servo plugged in to the two servo code should narrow down whether this is a software or power problem. If it only jitters when both are plugged in, I'd (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | dual servos
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Hello world, To richardv@abac.com, I am eagerly awaiting your results. To joe.doubek@privy.com, I'll keep you posted. So far I have gotten to the stage of pretty well ruling out input noise as the cause of twitching servos. I have almost identical (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | Re: dual servos
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I'm a newbie at this, but I just read yesterday on a web page that servos want a signal (20 ms = ?? degrees) every 50 milliseconds or so, and if you stop sending the signal, they "go limp" and don't "hold" position tightly, but are deenergized and (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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| | capacitor question
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I was just wondering about this - are you supposed to heatsink capacitors when soldering? My gut feeling says "no", except that my ECE TA seems to disagree. Any thoughts on this? (Sorry, this doesn't have too much to do with the handy board - (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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| | Re: power and servo
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[problem 1: voltage on motor chips when no motor voltage applied] This is normal, because the motor chip INPUTS have +5v signals on them. These signals "bleed" into the motor chip power supplies. This isn't dangerous, but it isn't particularly good (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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| | IR Demodulator
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Hello Everyone, I have had absolutely no luck in getting a IR Demodulator for my HB. I have tried every source given on this sight and even more. Can anyone help me to locate this part? Sharp (IS1U60) Having No Luck! Bill Rose (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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