IP Configuration

lib/Adafruit-MCP23008/examples/button/button.pde

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+#include <Wire.h>
+#include "Adafruit_MCP23008.h"
+
+// Basic pin reading and pullup test for the MCP23008 I/O expander
+// public domain!
+
+// Connect pin #1 of the expander to Analog 5 (i2c clock)
+// Connect pin #2 of the expander to Analog 4 (i2c data)
+// Connect pins #3, 4 and 5 of the expander to ground (address selection)
+// Connect pin #6 and 18 of the expander to 5V (power and reset disable)
+// Connect pin #9 of the expander to ground (common ground)
+
+// Input #0 is on pin 10 so connect a button or switch from there to ground
+
+Adafruit_MCP23008 mcp;
+  
+void setup() {  
+  mcp.begin();      // use default address 0
+
+  mcp.pinMode(0, INPUT);
+  mcp.pullUp(0, HIGH);  // turn on a 100K pullup internally
+
+  pinMode(13, OUTPUT);  // use the p13 LED as debugging
+}
+
+
+
+void loop() {
+  // The LED will 'echo' the button
+  digitalWrite(13, mcp.digitalRead(0));
+}

lib/Adafruit-MCP23008/examples/toggle/toggle.pde

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+#include <Wire.h>
+#include "Adafruit_MCP23008.h"
+
+// Basic toggle test for i/o expansion. flips pin #0 of a MCP23008 i2c
+// pin expander up and down. Public domain
+
+// Connect pin #1 of the expander to Analog 5 (i2c clock)
+// Connect pin #2 of the expander to Analog 4 (i2c data)
+// Connect pins #3, 4 and 5 of the expander to ground (address selection)
+// Connect pin #6 and 18 of the expander to 5V (power and reset disable)
+// Connect pin #9 of the expander to ground (common ground)
+
+// Output #0 is on pin 10 so connect an LED or whatever from that to ground
+
+Adafruit_MCP23008 mcp;
+  
+void setup() {  
+  mcp.begin();      // use default address 0
+
+  mcp.pinMode(0, OUTPUT);
+}
+
+
+// flip the pin #0 up and down
+
+void loop() {
+  delay(100);
+
+  mcp.digitalWrite(0, HIGH);
+
+  delay(100);
+
+  mcp.digitalWrite(0, LOW);
+}