 | | 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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| | HOW TO UNSUBSCRIBE
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Greetings, This is the periodic message about unsubscribing. Please DO NOT send unsubscribe messages to the whole list. To unsubscribe, send email to fredm@media.mit.edu. Regards, Fred (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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Hello, I'm at a loss for what will take to get either of the two boards into DL mode. The board has nothing plugged into it; the BATT and PWR LEDs flash on and then PWR remains on so I can not confirm the synptoms of the ds1233(U12) voltage monitor (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Unsubscribe
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unsubscribe Have compassion on those who live on earth and He who is in heaven will have compassion on you. God will show no compassion to him who has no compassion towards all mankind Prophet Muhammad (P.B.U.H.) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Re: your mail
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(...) Get your soldering iron, some solder labeled electronics use, some old circuit board, and solder away. Or, you could take an old computer board and desolder some components from it, and re-solder them in. Just get in there and do it. You know (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Re: Vector 2x compass
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A mistake has been found on the V2X schematic, the M/S pin on the compass needs to be grounded. I don't know what it is, everytime I publish something, I make a mistake. (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Strange HB problems
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Over the past two days I have had two problems with my HB that I can't explain. Maybe you you can help. 1. I wrote a simple program to test out my motors that consists of the motor, sleep, and beep commands. Once in a while I get an error back while (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | (no subject)
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Another note on soldering.. Heat control is VERY important.. Not so much being able to adjust the heat, as having a temperature-controlled iron. The "cheaper" irons get hotter or colder with the load (speed of soldering) as well as the room (...) (27 years ago, 19-May-97, to lugnet.robotics.handyboard)
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| | Re: Soldering (fwd)
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Often novices miss the single most fundamental point about soldering: you don't use the iron to melt the solder (99% of the time) -- you heat the component leads and let them melt the solder. To initially transfer heat effectively to the leads, a (...) (27 years ago, 18-May-97, to lugnet.robotics.handyboard)
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| | Re: Soldering
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(...) experience >at all with soldering. (...) become more >adept at this sort of stuff. And what type of solder should I use? Shane is right, you'll find using very thin solder works much better. Along with a fine tip, you'll want to use a low (...) (27 years ago, 18-May-97, to lugnet.robotics.handyboard)
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| | Soldering/ Second processor
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->Hi, I'm planning to purchase the handyboard as a kit from Digital Mirco System, since I'm a bit tight with money. However, I'm a bit hesitant (...) soldering. The trick is to use THIN 60/40 solder with flux core. Around 0.71 mm thickness is good. (...) (27 years ago, 17-May-97, to lugnet.robotics.handyboard)
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