 | | Re: High current motors
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(...) On the handy board, this is different, isn't it? I didn't think that the center pin was V+... In fact, isn't it not a connection at all? (...) Isn't this supposed to read, "Now connect the COLLECTOR of one 2N2907 to the base of Q1, connect the (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) Don't most IR sensors have a limited useful range, though? I understood that it was difficult to get more than 2-3 inches from an IR sensor - can they be made long-range sensitive? Sean R. Cunningham MSI Consulting Group (URL) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) For which I have only one comment, "Curtains". Yes, IR can see curtains, ultrasonics cannot. --Chuck (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | New Battery Hack + Charger
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This is in reference to the Motor Voltage Hack on the HandyBoard. In considering the prospect of including the new battery pack in the charge circuit, we should consider the following. 1) The machanics of charging a NiCad is to force a voltage that (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Ultrasound Range-Finding
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I have my Polaroid Sonar connected and running. It seems to work perfectly. There is no additional circuitry required. In fact it works so well, I am probably not going to install the IR system, at this time. Larry (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: motor voltages
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The most efficient way to do this is to use a "step down" regulator. These small switching regulators can efficiently lower the voltage while maintaining the current requirements. Maxim sell several chips that do this however you will be limited to (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) I thought I would add for all who haven't read the IC manual, (like me a few weeks back), that it clarifies alot of the capabilities and workings of the handyboard. And that it only takes like one night of bedtime reading so it's kinda short (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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I think what you need is only a simple VR( voltage regulator) It kinda resembles a transitor in appearance). I'm curious to know whether this is all you need. I'm not an EE either so I wonder if you need heat sinks or capacitors or something. ? (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Ultrasound Range-Finding
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I looked arround and this is the cheapestI've found so far. If you go to the various ultrasound specialists, they want an arm and a leg...make that your a torso too. I believe these polaroid things are manufactured in LARGE production conpared to (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Motor Voltage Hack
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(...) Yes, I believe so. I was thinking of that last night but haven't had a chance to look it over. I think you would need to temporarally reconnect the cut with some form of voltage drop,(several diodes in series ?) when the charger is connected. (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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