What would be the closest thing to the BS2, but with more I/O pins?

TonyA

Hi,

I am wondering about which stamp is the closest thing to the BS2, but with more I/O pins?

Thank you,
Tony

Jon Williams

The only BASIC Stamp that has more IO pins than the stock BS2 is the BS2p40. It will run your BS2 program(s), with some modifications required to time-critical instructions like SEROUT, PULSOUT, etc.· That said, if you're just looking to add simple inputs and outputs, using shift registers (less than a buck) is an easy way to do it).

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Jon Williams
Applications Engineer, Parallax

TonyA

Hi Jon,

Can you refer my to infop on using shift registers with the BS2?

Thanks again,
Tony

Jon Williams

Sure: Google 74HC595 and 75HC165. Checkout StampWorks, it has projects for both. StampWorks 2.0 (being edited now) shows how to combine them using only four IO lines (schematic and code attached -- do NOT leave out the 4.7K resistor).

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Jon Williams
Applications Engineer, Parallax

Post Edited (Jon Williams (Parallax)) : 9/5/2005 5:14:41 PM GMT

KenM

http://www.parallax.com/dl/docs/cols/nv/vol1/col/nv43.pdf

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Ken

TonyA

Hi,

Thanks for the info, very much appreciated. Thank you.

Tony

Bruce Bates

Tony -

You may also want to look at the Microchip MCP23016 for inexpensive (Mouser $1.25 US approx.), 16 bit, bi-directional (input and/or output) port expansion as well. With the BS-2 however, it requires a bit of bit-banging to implement the I2C protocal, which protocal is native to any of the BS-2p series Stamps which have a built-in set of I2CREAD and I2CWRITE commands. Here is a link to the chip, if you're interested:
http://www.microchip.com/stellent/idcplgidcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010412

I'd be happy to supply a link to the BS-2 bit-banging programming routines for I2C access, if you decide to head in that direction. Just shout if that's of interest to you.

Regards,

Bruce Bates