Added joystick mouse control example in libraries/Mouse/examples

libraries/Mouse/examples/JoystickMouseControl/JoystickMouseControl.ino

@@ -0,0 +1,115 @@
+/*
+  JoystickMouseControl
+ 
+ Controls the mouse from a joystick on an Arduino Leonardo.
+ Uses a pushbutton to turn on and off mouse control.
+ 
+ The mouse movement is always relative. This sketch reads 
+ two analog inputs that range from 0 to 1023 (or less on either end)
+ and translates them into ranges of -60 to 60. 
+ The sketch assumes that the joystick resting values are around the 
+ middle of the range, but that they vary within a threshold.
+ 
+ WARNING:  When you use the Mouse.move() command, the Arduino takes
+ over your mouse!  Make sure you have control before you use the command.
+ This sketch includes a pushbutton to toggle the mouse control state, so
+ you can turn on and off mouse control.
+ 
+ created 15 Sept 2011
+ by Tom Igoe
+ 
+ this code is in the public domain
+ 
+ */
+
+// set pin numbers for switch, joystick axes, and LED:
+const int switchPin = 6;      // switch to turn on and off mouse control
+const int xAxis = A1;         // joystick X axis  
+const int yAxis = A2;         // joystick Y axis
+const int ledPin = 5;         // Mouse control LED 
+
+// parameters for reading the joystick:
+int range = 12;               // output range of X or Y movement
+int responseDelay = 2;       // response delay of the mouse, in ms
+int threshold = range/4;      // resting threshold
+int center = range/2;         // resting position value
+int minima[] = { 
+  1023, 1023};                // actual analogRead minima for {x, y}
+int maxima[] = {
+  0,0};                       // actual analogRead maxima for {x, y}
+int axis[] = {
+  xAxis, yAxis};              // pin numbers for {x, y}
+int mouseReading[2];          // final mouse readings for {x, y}
+
+
+boolean mouseIsActive = false;    // whether or not to control the mouse
+int lastSwitchState = LOW;        // previous switch state
+
+void setup() {
+  pinMode(switchPin, INPUT);       // the switch pin
+  pinMode(ledPin, OUTPUT);         // the LED pin  
+}
+
+void loop() {
+  // read the switch:
+  int switchState = digitalRead(switchPin);
+  // if it's changed and it's high, toggle the mouse state:
+  if (switchState != lastSwitchState) {
+    if (switchState == HIGH) {
+      mouseIsActive = !mouseIsActive;
+  // turn on LED to indicate mouse state:
+  digitalWrite(ledPin, mouseIsActive);
+    } 
+  }
+  // save switch state for next comparison:
+  lastSwitchState = switchState;
+
+// read and scale the two axes:
+  int xReading = readAxis(0);
+  int yReading = readAxis(1);
+
+// if the mouse control state is active, move the mouse:
+  if (mouseIsActive) {
+    Mouse.move(xReading, yReading, 0);
+  }  
+  delay(responseDelay);
+}
+
+/*
+  reads an axis (0 or 1 for x or y) and scales the 
+  analog input range to a range from 0 to <range>
+*/
+
+int readAxis(int axisNumber) {
+  int distance = 0;    // distance from center of the output range
+  
+  // read the analog input:
+  int reading = analogRead(axis[axisNumber]);
+
+// of the current reading exceeds the max or min for this axis,
+// reset the max or min:
+  if (reading < minima[axisNumber]) {
+    minima[axisNumber] = reading;
+  }
+  if (reading > maxima[axisNumber]) {
+    maxima[axisNumber] = reading;
+  }
+  
+  // map the reading from the analog input range to the output range:
+  reading = map(reading, minima[axisNumber], maxima[axisNumber], 0, range);
+ 
+ // if the output reading is outside from the
+ // rest position threshold,  use it:
+  if (abs(reading - center) > threshold) {
+    distance = (reading - center);
+  } 
+  
+  // the Y axis needs to be inverted in order to 
+  // map the movemment correctly:
+  if (axisNumber == 1) {
+    distance = -distance;
+  }
+  
+  // return the distance for this axis:
+  return distance;
+}