 | | Re: Re[2]: phone cord length
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(...) On the phone cord between the handy board and the charger/interface card, the signal voltage is TTL levels. There is also charge voltage, and ground in the other wires. RS232 level conversion is done by the MAX232 on this card. (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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| | Re[2]: phone cord length
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TTL does NOT go down that line, it is RS232 which is commonly used at up to 50 feet. However, you might need to use a shielded cable if you use a lead longer than about 10 feet. Richard (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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| | Re[4]: IR Collision avoidance
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Adam, I don't use -5v, I just use a single 5v supply. You have to choose your op-amp carefully - I am currently trying ICL7612 but I'm looking at another sort which might turn out to be better. With a single supply, you have to bias things around (...) (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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| | Re: IR Collision avoidance
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The part number on the device from Radio Shack is "GP1U52X". In our earlier discussions, I thought I made it clear that I was using "the Radio Shack IR detector module", although I may not have quoted the number. If Sharp makes a module without the (...) (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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| | IR xmitter/receiver idea.
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Heres a IR xmitter/receiver idea for you; I've seen this approach used in equipment and it works very well, I'm not sure how well it will work for robotics but believe it can be adapted. This is difficult to explain but easy to build, so hang with (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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