Microchip MCP23X GPIO expander

tigershark35

Hi, does anyone have any code or suggestions to look for code for this IO expander.· I have found code for the 8 bit shift register that Parallax sells, but I have one of these chips and am not good enough to interprete what I need from the spec sheet.

I want to have up to 16 outputs from a serial input from a stamp. I want to use as few pins as possible.

Thanks

Newzed

The MCP23016 is an I2C chip and works best with a BS2p or a BS2pe.· It will tun on a BS2 or BS2E, but it requires a special program.· What Stamp are you using?· I have codes for the BS2pe and the BS2.

Sid



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Sid Weaver
Need a TV Module?

Newzed@aol.com
·

Chris Savage

Hello,
·
·· 16 outputs can be gotten easier using the 74HC595 Shift Register using only 3 I/O lines.· The MCP23X will require more code to do the same work.· Of course this is assuming you’re just trying to make certain pins HIGH/LOW.· I hope this helps.· Take care.

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Chris Savage
Parallax Tech Support

tigershark35

Thanks Chris and Sid. I have one a sample of the MCP23X so I thought I would give it a try. I would like to see the code Sid. But Chris - i have some of the 74HC595 s on order and have seen the code from one of the experiments.

Thanks
JG

tigershark35

Oh, I forgot, I am using a BS2

JG

Newzed

JG, here is the code for a BS2.

Sid

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Sid Weaver
Need a TV Module?

Newzed@aol.com

tigershark35

Thanks
JG