 | | Re: SHARP new product
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I was looking at that this weekend. I am presently using 4 gp2d02's and am about to order 2 more. the distance on these gp2d12's is no different and I think one might have more control over the gp2d02 since you control the digital output to it (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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| | Re: charger
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the main reason this doesn't work is the 1a supply produces too high a voltage at the actual current being drawn, resulting too high a charge rate. technically, it will work in NORMAL charge mode, but you'll be charging the battery too fast, (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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| | Re: charger
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Hi all: The problem with using a wall wart that is NOT 12 V @ 500 mA is this: most wall warts are _not_ regulated, and they have a fairly high internal impedance. If there is no load on a "12 V" unit, the output voltage will likely be at least 18 V, (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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| | Measuring motors current
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Hi, I'm using for my base 12 v geared motors ,without load, each one drives less than 100 mA, but when stalled, the current grow to 500 mA, wich is to close to the 600 mA of L293 chips, i do not need more current, but i want to protect the L293 from (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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| | Re: charger
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(...) I'm relying on non-handyboard experience here, but I'm going to assume that's too much. One amp is a heavy load, and although there's a 5v regulator on the circuit, I'd guess that it's not rated for 1 amp (it may just run hot) and might not be (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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| | SHARP new product
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Hello everyone, Sharp recently release the new GP2D12 (General Purpose Distance Measuring Sensors). Which performs same as the GP2D02. The new product have only 3 pins - Vo, Gnd, and 5V. Vo is an analog output, which means you can use it on any (...) (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | Re: charger
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(...) In short, No. The charging cicuitry on the HB (especially the zap mode) is designed for a 500ma supply. People have had problems with 1 amp ones. Best, Duncan (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | Re: Batteries
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(...) Umm, not sure what you mean by "a current rating of 1A or more". Do you mean 1Ah ? It's certainly alright to use a 9.6v battery with a *capacity* of 1Ah or more... Cheers, Duncan (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | charger
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I have an old 'wall wart' lying around. It has a rating of (12 vdc 1 amp output). i was wondering if i can use it on the handy board. the specs i read about the handy board call for a 12v 500mAmp output. any response would be appreciated. FRED (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | Batteries
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Hi Guys, I was wondering if is it safe to use a 9.6V battery pack with a current rating of 1A or more? (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | DS1233 and Resistor Packs
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I am assembling my Handy Board, and I have a lot of troubles to find, the resistor packs and the DS1233. 1.- Is there any way that I could build one? 2.- Does anybody knows the internal config of a resistor pack (the ones the handy board uses)? 3.- (...) (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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| | Re: Motor driver source
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Hi Jon, Try (URL) (800-524-6464) I'm looking at their printed catalog now and the part number is L293D. They sell for $2.95/each and there's no minimum order!! I've bought about 50 of them two months ago and they work great! Good luck, kam (URL) (...) (25 years ago, 8-May-99, to lugnet.robotics.handyboard)
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| | Re: Motor driver source
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"Eat Bugs!" wrote: <snip> (...) Dear Mr. Bugs: The SN754410 by T.I. is a direct replacement for the L293D and it handles more current. It is the chip that Gleason Research installs on its HandyBoards. Acroname stocks the part: (URL) fun, - - - Nick (...) (25 years ago, 8-May-99, to lugnet.robotics.handyboard)
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| | Motor driver source
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Does anybody have a source for the L293D motor driver IC from SGS-Thompson? I'm building a 6811F1 and a 6816 based robot, and I can't find a source for the driver. The Handyboard parts list just says that SGS-Thompson is the manufacturer. Thanks. (25 years ago, 8-May-99, to lugnet.robotics.handyboard)
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| | serial port queue
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dear colleagues, for a project, my group implemented an interrupt driven serial port queue for the handyboard. if there is enough interest, we can package it and make it available. regards. jaime montemayor, graduate school fellow <monte@cs.umd.edu> (...) (25 years ago, 8-May-99, to lugnet.robotics.handyboard)
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| | RJ11 on the interface board
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Hello What is the difference between having a side entry RJ11 or a top entry on the interface board. Are the pins in the same order. Thanks Scott Moore (25 years ago, 8-May-99, to lugnet.robotics.handyboard)
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| | Re: PURCHASE IN MIAMI OR BOSTON (Final Response)
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Hello Peter and all handyboard members, Thanks for all the input about my service. However, we shouldn't waste too much bandwidth on this stuff in this mailing list (Sorry, Fred!). We should focus on discussing the application of MIT Handyboard (...) (25 years ago, 7-May-99, to lugnet.robotics.handyboard)
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| | Re: Dumb math question related to Navigation and encoders
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Dear Bob, Trigonometric library functions are available in interactive C. (...) The following functions are available(Refer to IC manual available at the MIT site) float sin(float angle) returns sine of an angle given in radians. float cos(float (...) (25 years ago, 7-May-99, to lugnet.robotics.handyboard)
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| | Re: PURCHASE IN MIAMI OR BOSTON
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This is surpassing, I purchased from Mr Hui. No problems getting it except it sat in customs longer than it took to transport 'cos customs people are idiots. I then sent the whole thing back after a chip failed on the serial board. It was fixed and (...) (25 years ago, 7-May-99, to lugnet.robotics.handyboard)
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| | Re: PURCHASE IN MIAMI OR BOSTON
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This seems strange. I bought my board (assembled) from patrick about 8 months ago. It arrived within about 3 days (to Australia). I was given my own IC keys and registered to my name. Email response was very quick, normally only a few hours, and (...) (25 years ago, 7-May-99, to lugnet.robotics.handyboard)
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