Hi
I've been trying to connect MCP23017 to the Arduino Duemilanove, and make a led blink. I've tried some of the solutions from the forum, but had no luck. Could somebody help me?
Cheers
We can't do anything till we know what you are trying (link to the forum entry you mention) and how everything is connected. Have you interfaced to a I2C chip before successfully?
You may find the library and code here useful: centipede_shield [macetech documentation]
The Centipede Shield uses MCP23017, so it should work fine with any MCP23017 chip as long as you have things wired correctly.
Hi
I'm building a board that can control up to 12 relays and 12 RFID readers (wiegand26 type).
I've successfully connected the MCP23017, and activated the relays. For controlling the MCP23017, I'm using the MCP23017 library (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1261312526), but it doesn't have support for the interrupts, which I need for the RFID readers, to be able to read the RFID value from the cards.
Wiring is done like in this link http://www.gammon.com.au/forum/bbshowpost.php?bbsubject_id=10945
Has anyone managed to attach an interrupt from the MCP23017?
By the way, the link centipede_shield [macetech documentation] is dead
Cheers