>> Tell the group what you're trying to do, based on your
>> requirements there are several alternatives!
>>
>> What type of application is this for?
>
>This is totally off topic, by the way. Sorry...
>
>I have an embedded computer which has four user
>readable DIP switches on it. Board is running
>at 3.3 volts. I want to be able to distinguish
>between 7 possible SPST switches being closed
>(one at a time) or all being open. I thought
>"OK. I'll just convert the single switch event
>to a binary number by hooking it to the appropriate
>pins on the DIP switch. Then I'll prevent the
>multi-bit numbers from cross feeding the single
>bit events by putting diodes in." But, the diodes
>have too much resistance for the board to see the
>switch as closed. The single-bit switches, 1, 2
>and 4, read just fine.
>
>Bill
Sounds like a job for an IC, like 8 bit parallel to serial using one dip
switch input for serial data perhaps clocked by sequential reads. Maybe a 7
bit binary to octal? 8 bit multiplexer?
Sheesh, I shudder to think how many pens are busy on the backs of envelopes
right now.
Received on Tue Feb 22 2000 - 16:52:02 GMT
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: Fri Oct 10 2014 - 23:32:53 BST