 | | 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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