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121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/*
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JoystickMouseControl
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Controls the mouse from a joystick on an Arduino Leonardo.
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Uses a pushbutton to turn on and off mouse control.
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Hardware:
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* 2-axis joystick connected to pins A1 and A2
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* pushbutton connected to pin D6
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The mouse movement is always relative. This sketch reads
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two analog inputs that range from 0 to 1023 (or less on either end)
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and translates them into ranges of -60 to 60.
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The sketch assumes that the joystick resting values are around the
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middle of the range, but that they vary within a threshold.
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WARNING: When you use the Mouse.move() command, the Arduino takes
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over your mouse! Make sure you have control before you use the command.
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This sketch includes a pushbutton to toggle the mouse control state, so
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you can turn on and off mouse control.
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created 15 Sept 2011
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updated 16 Jan 2012
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by Tom Igoe
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this code is in the public domain
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*/
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// set pin numbers for switch, joystick axes, and LED:
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const int switchPin = 6; // switch to turn on and off mouse control
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const int xAxis = A1; // joystick X axis
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const int yAxis = A2; // joystick Y axis
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const int ledPin = 5; // Mouse control LED
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// parameters for reading the joystick:
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int range = 12; // output range of X or Y movement
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int responseDelay = 2; // response delay of the mouse, in ms
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int threshold = range/4; // resting threshold
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int center = range/2; // resting position value
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int minima[] = {
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1023, 1023}; // actual analogRead minima for {x, y}
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int maxima[] = {
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0,0}; // actual analogRead maxima for {x, y}
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int axis[] = {
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xAxis, yAxis}; // pin numbers for {x, y}
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int mouseReading[2]; // final mouse readings for {x, y}
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boolean mouseIsActive = false; // whether or not to control the mouse
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int lastSwitchState = LOW; // previous switch state
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void setup() {
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pinMode(switchPin, INPUT); // the switch pin
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pinMode(ledPin, OUTPUT); // the LED pin
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}
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void loop() {
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// read the switch:
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int switchState = digitalRead(switchPin);
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// if it's changed and it's high, toggle the mouse state:
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if (switchState != lastSwitchState) {
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if (switchState == HIGH) {
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mouseIsActive = !mouseIsActive;
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// turn on LED to indicate mouse state:
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digitalWrite(ledPin, mouseIsActive);
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}
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}
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// save switch state for next comparison:
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lastSwitchState = switchState;
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// read and scale the two axes:
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int xReading = readAxis(0);
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int yReading = readAxis(1);
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// if the mouse control state is active, move the mouse:
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if (mouseIsActive) {
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Mouse.move(xReading, yReading, 0);
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}
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delay(responseDelay);
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}
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/*
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reads an axis (0 or 1 for x or y) and scales the
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analog input range to a range from 0 to <range>
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*/
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int readAxis(int axisNumber) {
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int distance = 0; // distance from center of the output range
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// read the analog input:
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int reading = analogRead(axis[axisNumber]);
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// of the current reading exceeds the max or min for this axis,
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// reset the max or min:
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if (reading < minima[axisNumber]) {
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minima[axisNumber] = reading;
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}
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if (reading > maxima[axisNumber]) {
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maxima[axisNumber] = reading;
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}
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// map the reading from the analog input range to the output range:
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reading = map(reading, minima[axisNumber], maxima[axisNumber], 0, range);
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// if the output reading is outside from the
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// rest position threshold, use it:
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if (abs(reading - center) > threshold) {
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distance = (reading - center);
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}
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// the Y axis needs to be inverted in order to
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// map the movemment correctly:
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if (axisNumber == 1) {
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distance = -distance;
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}
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// return the distance for this axis:
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return distance;
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}
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