Create JoystickMouseControl.ino

JoystickMouseControl.ino

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+/*
+  JoystickMouseControl
+
+  Controls the mouse from a joystick on an Arduino Leonardo, Micro or Due.
+  Uses a pushbutton to turn on and off mouse control, and a second pushbutton
+  to click the left mouse button.
+
+  Hardware:
+  - 2-axis joystick connected to pins A0 and A1
+  - pushbuttons connected to pin D2 and D3
+
+  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 -6 to 6.
+  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 Sep 2011
+  updated 28 Mar 2012
+  by Tom Igoe
+
+  This example code is in the public domain.
+
+  http://www.arduino.cc/en/Tutorial/JoystickMouseControl
+*/
+
+#include "Mouse.h"
+
+// set pin numbers for switch, joystick axes, and LED:
+const int switchPin = 2;      // switch to turn on and off mouse control
+const int mouseButton = 3;    // input pin for the mouse pushButton
+const int xAxis = A0;         // joystick X axis
+const int yAxis = A1;         // 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 = 5;        // response delay of the mouse, in ms
+int threshold = range / 4;    // resting threshold
+int center = range / 2;       // resting position value
+
+bool 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
+  // take control of the mouse:
+  Mouse.begin();
+}
+
+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(A0);
+  int yReading = readAxis(A1);
+
+  // if the mouse control state is active, move the mouse:
+  if (mouseIsActive) {
+    Mouse.move(xReading, yReading, 0);
+  }
+
+  // read the mouse button and click or not click:
+  // if the mouse button is pressed:
+  if (digitalRead(mouseButton) == HIGH) {
+    // if the mouse is not pressed, press it:
+    if (!Mouse.isPressed(MOUSE_LEFT)) {
+      Mouse.press(MOUSE_LEFT);
+    }
+  }
+  // else the mouse button is not pressed:
+  else {
+    // if the mouse is pressed, release it:
+    if (Mouse.isPressed(MOUSE_LEFT)) {
+      Mouse.release(MOUSE_LEFT);
+    }
+  }
+
+  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 thisAxis) {
+  // read the analog input:
+  int reading = analogRead(thisAxis);
+
+  // map the reading from the analog input range to the output range:
+  reading = map(reading, 0, 1023, 0, range);
+
+  // if the output reading is outside from the rest position threshold, use it:
+  int distance = reading - center;
+
+  if (abs(distance) < threshold) {
+    distance = 0;
+  }
+
+  // return the distance for this axis:
+  return distance;
+}