Tutorial: How to Use Arduino Uno as HID | Part 2: Arduino Mouse Emulation

  1
  2/* Arduino USB Mouse HID demo */
  3/* Author: Darran Hunt
  4 * Release into the public domain.
  5 * 
  6 * Modified: George Bantique
  7 *           TechToTinker
  8 */
  9
 10//#define ORIGINAL_CODE   // to display the original code
 11#define MODIFIED_CODE   // to display the modified code
 12//#define SERIAL_DEBUG    // to overwrite the mouse hid character with printable character
 13 
 14struct {
 15    uint8_t buttons;
 16    int8_t x;
 17    int8_t y;
 18    int8_t wheel;   /* Not yet implemented */
 19} mouseReport;
 20 
 21uint8_t nullReport[4] = { 0, 0, 0, 0 };
 22 
 23void setup();
 24void loop();
 25
 26
 27#ifdef MODIFIED_CODE
 28
 29#define ONBOARD_LED 13
 30#define SR_PIN  A2
 31#define XR_PIN  A1
 32#define YR_PIN  A0
 33
 34int xr_rest, yr_rest;
 35
 36void setup()
 37{
 38    Serial.begin(9600);
 39
 40    pinMode(ONBOARD_LED, OUTPUT);
 41    pinMode(SR_PIN, INPUT_PULLUP);
 42    pinMode(XR_PIN, INPUT);
 43    pinMode(YR_PIN, INPUT);
 44
 45    mouseReport.buttons = 0;
 46    mouseReport.x = 0;
 47    mouseReport.y = 0;
 48    mouseReport.wheel = 0;
 49
 50    // save the rest value
 51    xr_rest = analogRead(XR_PIN);
 52    yr_rest = analogRead(YR_PIN);
 53}
 54
 55void loop()
 56{
 57    uint8_t s_temp;
 58    int x_temp, y_temp, ind;
 59
 60    if (digitalRead(SR_PIN)) {
 61      s_temp = 0;
 62    } else {
 63      s_temp = 1;
 64    }
 65
 66    int xr_val = analogRead(XR_PIN);
 67    int yr_val = analogRead(YR_PIN);
 68
 69    if (xr_val == xr_rest) {
 70      // joystick is not move
 71      x_temp = 0;
 72    } else if (xr_val < xr_rest) {
 73      // joystick to the left
 74      x_temp = - map(xr_val, 0, xr_rest, 10, 0);
 75    } else {
 76      // joystick to the right
 77      x_temp = map(xr_val, xr_rest, 1023, 0, 10);
 78    }
 79
 80    if (yr_val == yr_rest) {
 81      // joystick is not move
 82      y_temp = 0;
 83    } else if (yr_val < yr_rest) {
 84      // joystick to the left
 85      y_temp = - map(yr_val, 0,yr_rest, 10, 0);
 86    } else {
 87      // joystick to the right
 88      y_temp = map(yr_val, yr_rest,1023, 0, 10);
 89    }
 90
 91#ifdef SERIAL_DEBUG
 92    Serial.print("X: ");
 93    Serial.println(x_temp);
 94    Serial.print("Y: ");
 95    Serial.println(y_temp);    
 96#endif // SERIAL_DEBUG
 97
 98    mouseReport.buttons = s_temp;
 99    mouseReport.x = x_temp;
100    mouseReport.y = y_temp;
101    mouseReport.wheel = 0;
102    
103    for (int ind = 0; ind < 20; ind++) {
104      Serial.write((uint8_t *)&mouseReport, 4);
105      Serial.write((uint8_t *)&nullReport, 4);
106    }
107}
108#endif // MODIFIED_CODE
109
110#ifdef ORIGINAL_CODE
111void setup()
112{
113    Serial.begin(9600);
114    delay(200);
115}
116 
117/* Move the mouse in a clockwise square every 5 seconds */
118void loop()
119{
120    int ind;
121    delay(1000);
122 
123    mouseReport.buttons = 0;
124    mouseReport.x = 0;
125    mouseReport.y = 0;
126    mouseReport.wheel = 0;
127
128    // Going left
129    mouseReport.x = -2;
130    for (ind = 0; ind < 20; ind++) {
131    Serial.write((uint8_t *) &mouseReport, 4);
132    Serial.write((uint8_t *) &nullReport, 4);
133    }
134
135    // Going up
136    mouseReport.x = 0;
137    mouseReport.y = -2;
138    for (ind = 0; ind < 20; ind++) {
139    Serial.write((uint8_t *)&mouseReport, 4);
140    Serial.write((uint8_t *)&nullReport, 4);
141    }
142
143    // Going right
144    mouseReport.x = 2;
145    mouseReport.y = 0;
146    for (ind = 0; ind < 20; ind++) {
147    Serial.write((uint8_t *)&mouseReport, 4);
148    Serial.write((uint8_t *)&nullReport, 4);
149    }
150
151    // Going down
152    mouseReport.x = 0;
153    mouseReport.y = 2;
154    for (ind = 0; ind < 20; ind++) {
155    Serial.write((uint8_t *)&mouseReport, 4);
156    Serial.write((uint8_t *)&nullReport, 4);
157    }
158}
159#endif // ORIGINAL_CODE