 | | HB does not enter on bootstrap mode
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I followed step 4.4 in the HB assembly manual. I hold down STOP-SW while powering on the board, then the battery LED light for 1/3 s, but the power light does not go OFF. I have checked that the MODA signal and the RESET are present at the 68HC11, (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: AS11 IC?
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You can get the PC version of everything you need to compile .ASM source code into IC compatible .ICB files at (URL) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: FW: expansion board schematic posted
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Sean, Using two of the SPI port pins, and a MUX and DEMUX, you should be able to gang together four of the Polaroid ultrasonic sensors. See if the code below makes sense. I wrote it a while ago, when I wanted more Polaroids, but - I didn't actually (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board/multiple sonar
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It's actually a '374 or '373 for outputs. I guess you could use them for inputs too, but you're better off using a '244 for input. Or even a '574, '573, '541, these chips put inputs on one side and outputs on the other. Very convenient. Even (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board schematic posted
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(...) I would love to see more digital outputs put on the expansion board. Just out of curiosity, is the Poloroid sonar connection still going to be on the board. That is what I am waiting for most of all. Keith (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | To Add my 2.5 cents
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I think the expansion board is A-OK as it is. (I'm being rather selfish since the Hartford Firefighting contest is in April). -Jim (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | large # of digital I/O's
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Check out the 82C55. In a 40 pin package, it has 24 bits of digital bidirectional I/O, and can be bit- or byte- addressed. It's cheap (like $4 or so in quantity). The 40-pin DIP package is big, but not compared to 3 20-pin DIP packages which it can (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | FW: I agree-
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Servos outputs are good, but generic handyboard serial output to Scott Edward's Serial Servo Controller would be faster to implement and design, much and simpler to work with, and would be extensible to other serial projects too. (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | FW: expansion board schematic posted
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I'd agree with this option - I don't need any more inputs, but I do need 4 logical outputs 2-4 Hi-current outputs Serial communications 1 (preferably 2) sonar connectors I could really use that second sonar. I don't suppose there is a way you could (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board schematic posted
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While I've only been working with the Handy Board for a week or so, I would also like to see several more outputs added. Perhaps some combination such as 8 digital (CMOS) outputs, and 8 of the dual-transistor types. If you could rig it up with (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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