 | | Has anyone built this homebrew sonar ranging board?
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(URL) a system similiar to the Polaroid 6500, but costs <$10 to build. Has anyone done it? Should I try it and share the results? (of course I should!) Does anyone see any major drawbacks after reading that, as compared to the Polaroid 6500? Is (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Re: Digital Micro Systems
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Joseph, (...) I have been trying for two weeks to get a hold of them. None of my messages (phone/email) are answered, and I am still waiting for the parts (high current H-bridges) to arrive. I suppose they still don't have them in stock, but it (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Digital Micro Systems
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I placed an order with Digital Micro Systems for two complete handyboard systems on 16-April-97. Delivery was promised by 5/12. It has not been received. Three phone calls to their answering machine (is this place ever open?) have remained (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Re: Generic 68HC11 board question-
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w/o the ds1233, the contents of the ram will become corrupted during power-up or power-down of the 6811. an r/c could protect during power-up, but wouldn't reset the 6811 during power down. remember it's still trying to execute code as system (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Soldering...
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(...) Mirco >System, since I'm a bit tight with money. However, I'm a bit hesitant >about assembling the kit because I have no experience at all with (...) like the HB before (I'm a software type guy), but thanks to Fred Martin's concise (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | re: Digital Micro Systems
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(...) I called them up a couple of weeks ago to order complete boards, and they said they were backordered on the completed kits, but could send an unassembled kit. So I ordered a kit and it arrived in 3 days. It turned out that I had received a bad (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Generic 68HC11 board question-
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Howdy- I was wondering about the DS1233 EconoReset thingy- what would happen if it wasn't there and reset was just tied high or through a RC delay to high? Does the DS1233 just add to 'reset stability' or is it important to keep reset from going (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | Re: buying Chips
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(...) Jameco's (www.jameco.com) May-June-July catalog lists them for 13.95 in quantities of 1-9. They're on page 13 but they are the wrong (Dual in Line) package so I'm not sure this helps. Bob. (...) Robert - Bob - Campanini 913/843-6412 2706 (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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| | buying Chips
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Anyone know where to get a hold of one 6811 microprocessor for around $10? Everything I've seen sofar either wants you to buy in bulk (you have to buy 23 @ $7.11 from Motorolla) or almost $20 for 1 chip. This stinks! Any info would be appreciated. (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Re: Handy Board Problem: getting hb back into download mode
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(...) Are you holding down the STOP button? With the board powered on, read the voltage at pin 3 of the 6811. When pressing the STOP button, pin 3 should read between zero volts and 0.6v. Releasing the STOP button, you should get 5v. If you get 5v (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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