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(...) Yes I am in the UK, full address detailed below. The price of my boards is £19-50 for the pair (Handyboard and Charger/IF) which includes first class recorded delivery postage to anywhere in UK or airmail to Europe and any other zone one (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: High current speed controllers
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Whoops, the url for my H-bridge design should be: (URL) previous version was missing the 'robotics' in the middle. Thanks to Mike for pointing that out. --Chuck (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: tracking an IR beacon
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If you want to get into _all_ the details of tracking you might see if the local library has a copy of "Tracking Multiple Targets with Examples from RADAR" published by ArTech House. This book is crammed with densely worded (and annotated with math) (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: High current speed controllers
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As for your question about controlling a motor with a PWM signal versus an analog level controlled by a power transistor, the issue is efficiency and power dissipation. If you use a power transistor to set the voltage at the motor, it will have to (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: High current speed controllers
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I designed a high-current H-bridge to use with my Handyboard (the specs are at (URL) heat sinks on the MOSFETs the bridge can control 50A. (You can substitute fets to get more power). The known problems with this design so far are that the power to (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | re: New Expansionboard
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It looks good to me, I would be interested. Bill James | work: 972.480.2306 Product Test Specialist | Pager: 972.597.6201 w-james2@ti.com Precision Analog & Interface Department Polymath in Training | Have Spacesuit will Travel ---...--- Original (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Recycled Sonar units
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Hello All, I have salvaged two modules from Polaroid cameras. My question is ... the pin outs on the control board for the "Spectra" has 17 straight in a line pin ins and the other module and board from a Autofocus 660 has 8 straight in a line pin (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Anyone using the motor powewr header J13 ????
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Hi all, for designing reasons I wonder if anyone is using the Motor Power Header J13. Would anyone be pleased if we added an extra power connector to our expansionboard to supply J13 with more power ??? Thanks..... Tom (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | New Expansionboard
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Hi all We at the TWI (School of engineering, www.twi.ch) in Switzerland are using the Handyboard for several projects. One of them is a model car with ultrasonic sensors and model servos. Because of some limitations of the Handyboard we have built a (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: High current speed controllers
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Thomas, We are using the HB to control an AstroFligt 50A controller. The controller comes standard with a 20K pot to vary the PWM signal. What I did as substitute the 20K pot with a DallasSimi DS1803 pot. Its a 14 (I think) dip package that uses I2C (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Interrupt Programming
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We are building a mobile robot using the Handy Board and we desperately need help. To read into the sensors, we are programming using Interactive-C interupts. Would this be a good idea, and if so how do you do it as we are not quite sure. Are there (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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| | Re: tracking an IR beacon
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The phase difference seen by the sensors would be tiny at any practical frequency. Assume that you have the sensors a distance, D, apart and facing 'forward' on the robot. If there is a transmitting source at 90 degrees to the forward direction, the (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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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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| | Re: tracking an IR beacon
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(...) Hmmm...mmm... welllll.. if you are planning to use the GPUI series or equiv. as your detectors.. I think you may run into problems with attempting to detect critical time information about the modulated waverform. Namely, and I'm no expert on (...) (27 years ago, 7-Dec-97, to lugnet.robotics.handyboard)
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| | IR Disturbance?
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Hi, I'm trying to do the Trinity College contest for my science project. I'm using IR reflectance sensors to navigate the walls. But when I tried with the candle the robot went haywire. I think it's due to the IR eminating from the candle. How can I (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | Re: tracking an IR beacon
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I'm no electronic wizard which I think you probably would have to be to even consider what you are suggesting. Wouldn't it be simpler to just shield your sensors so that they 'look' in different directions? Have one look a little bit left and the (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | new version of 6811 Downloader for Mac
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Hi all, The 6811 Downloader program was starting to be flaky under System 8, so I fixed an odd serial bug. More like a work-around, actually. Anyway, if you use this program, and it is starting to flake out on you, download the new version. It's at (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | Re: High current speed controllers
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(...) Tom, Try this company , They have single and dual Forward/Reverse proportional speed controls for 4.8 - 140vdc at up to 220 amps and 3 hp. 500oz/in to 27 foot/pound packaged servos. I have a catalog from this company, great stuff but the price (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | Short?
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Hi, U13 (voltage regulator) blew on my Handy Board, so I replaced it. Somehow I think I shorted out the polyswitch fuse(F1) and the voltage regulator (shorted the pins that are closest to eachother. Now if I plug my HB in, the BATT, PWR, motor 2, (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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| | High current speed controllers
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Hello, I was wondering if anyone could recommend a speed controller circuit for controlling a 12VDC motor which could draw up to 25A. I'd like to use the Handy Board to control its speed. Cost is not a big concern but compactness is. I would (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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