I/O: Move GPIO examples away from I2C pins

It appears as if using the I2C pins for GPIO requires a restart of the Raspberry Pi before the I2C interface can be used again. Play safe and move the examples to pins that aren't used for anything else.

java/libraries/io/examples/Interrupt/Interrupt.pde

@@ -1,20 +1,20 @@
 import processing.io.*;
 color bgcolor = 0;
 
-// RPI.PIN3 refers to the physical pin 3 on the Raspberry Pi's
-// pin header, which is located on the third row, next to a
-// Ground pin
+// RPI.PIN7 refers to the physical pin 7 on the Raspberry Pi's
+// pin header, which is located on the fourth row, above one of
+// the Ground pins
 
 void setup() {
-  GPIO.pinMode(RPI.PIN3, GPIO.INPUT);
-  GPIO.attachInterrupt(RPI.PIN3, this, "pinEvent", GPIO.RISING);
+  GPIO.pinMode(RPI.PIN7, GPIO.INPUT);
+  GPIO.attachInterrupt(RPI.PIN7, this, "pinEvent", GPIO.RISING);
 }
 
 void draw() {
   background(bgcolor);
 }
 
-// this function will be called whenever pin 3 is brought from LOW to HIGH
+// this function will be called whenever pin 7 is brought from LOW to HIGH
 void pinEvent(int pin) {
   println("Received interrupt");
   if (bgcolor == 0) {

java/libraries/io/examples/SimpleInput/SimpleInput.pde

@@ -1,18 +1,18 @@
 import processing.io.*;
 
-// RPI.PIN3 refers to the physical pin 3 on the Raspberry Pi's
-// pin header, which is located on the second row, next to the
-// 5v power pin
+// RPI.PIN7 refers to the physical pin 7 on the Raspberry Pi's
+// pin header, which is located on the fourth row, above one of
+// the Ground pins
 
 void setup() {
-  GPIO.pinMode(RPI.PIN3, GPIO.INPUT);
+  GPIO.pinMode(RPI.PIN7, GPIO.INPUT);
   // this is equivalent to addressing the pin with its GPIO number:
-  // GPIO.pinMode(2, GPIO.INPUT);
+  // GPIO.pinMode(4, GPIO.INPUT);
 }
 
 void draw() {
   // sense the input pin
-  if (GPIO.digitalRead(RPI.PIN3) == GPIO.HIGH) {
+  if (GPIO.digitalRead(RPI.PIN7) == GPIO.HIGH) {
     fill(255);
   } else {
     fill(204);

java/libraries/io/examples/SimpleOutput/SimpleOutput.pde

@@ -1,14 +1,14 @@
 import processing.io.*;
 boolean ledOn = false;
 
-// RPI.PIN5 refers to the physical pin 5 on the Raspberry Pi's
-// pin header, which is located on the third row, next to a
-// Ground pin
+// RPI.PIN7 refers to the physical pin 7 on the Raspberry Pi's
+// pin header, which is located on the fourth row, above one of
+// the Ground pins
 
 void setup() {
-  GPIO.pinMode(RPI.PIN5, GPIO.OUTPUT);
+  GPIO.pinMode(RPI.PIN7, GPIO.OUTPUT);
   // this is equivalent to addressing the pin with its GPIO number:
-  // GPIO.pinMode(3, GPIO.OUTPUT);
+  // GPIO.pinMode(4, GPIO.OUTPUT);
   frameRate(0.5);
 }
 
@@ -16,10 +16,10 @@ void draw() {
   // make the LED blink
   ledOn = !ledOn;
   if (ledOn) {
-    GPIO.digitalWrite(RPI.PIN5, GPIO.LOW);
+    GPIO.digitalWrite(RPI.PIN7, GPIO.LOW);
     fill(204);
   } else {
-    GPIO.digitalWrite(RPI.PIN5, GPIO.HIGH);
+    GPIO.digitalWrite(RPI.PIN7, GPIO.HIGH);
     fill(255);
   }
   stroke(255);