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ideas for reading a lot of voltages?

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KTP:

--- Quote from: alm on July 12, 2010, 10:29:43 pm ---Cheapest switch $5? Something like 74HC4067 (1:16) is <$1, so is 74HC4051 (1:8, more voltage range). Not sure if these match your requirements, but they're nowhere near $5.

--- End quote ---

Grrr, I swear I put the correct information into the Digikey parametric search but all I came up with was the $5 part as the cheapest.  Thanks for doing the correct search for me!  ;)

74HC4067 x 2 at $0.97, Atmel AVR anything at $1-$2, a few resistors and a buzzer...$5 solution!  Sweet.

Zero999:
I didn't know the old CMOS switches came in HC versions with much better characteristics, still limited to 10V though but it's better than most HC devices which typically work up to 6V maximum.

Zad:
The PIC18F44K22 has 28 channels at 10 bits. Price is from US$2:41 in single quantities. Also available in DIP packaging.

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en547758

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