From f73b77bad50099d7b7922e8fdb65afaf9efe8705 Mon Sep 17 00:00:00 2001 From: Frank Adams <33405607+thedalles77@users.noreply.github.com> Date: Mon, 27 Dec 2021 10:28:05 -0800 Subject: [PATCH] Add files via upload --- .../Logitech_K120_4p1_ergotrac.ino | 548 ++++++++++++++++++ 1 file changed, 548 insertions(+) create mode 100644 Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino diff --git a/Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino b/Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino new file mode 100644 index 0000000..2d70e75 --- /dev/null +++ b/Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino @@ -0,0 +1,548 @@ +/* Copyright 2021 Frank Adams + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + http://www.apache.org/licenses/LICENSE-2.0 + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +*/ +// This software implements a Logitech K120 Keyboard Controller and a Fujitsu Ergotrac touch sensor +// using a Teensy 4.1. The Teensy keyboard signals are wired to a pcb with pads. The flexible sheets +// with traces in the keyboard are pressed against the pcb pads to make the connection. No FPC connector is used. +// The Ergotrac is sent a logic level pulse after the keyboard scan and two ADC channels read the voltage +// to sense the up/down and left/right movement +// +// Revision History +// Initial Release Dec 26, 2021 +// +// keyboard values +#define MODIFIERKEY_FN 0x8f // give Fn key a HID code +#define CAPS_LED 22 // Teensy LED shows Caps-Lock +#define NUM_LED 23 +// X/Y outputs from ErgoTrac feed Teensy ADC channels +#define ErgoTrac_X A17 +#define ErgoTrac_Y A16 +// Reference signal from Teensy in to ErgoTrac +#define ErgoTrac_Ref 39 +// +// +const byte rows_max = 18; // sets the number of rows in the matrix +const byte cols_max = 8; // sets the number of columns in the matrix +// +// Load the normal key matrix with the Teensyduino key names described at www.pjrc.com/teensy/td_keyboard.html +// A zero indicates no normal key at that location. +// +int normal[rows_max][cols_max] = { + {0,0,0,0,0,0,0,0}, + {KEY_ESC,KEY_TILDE,KEY_TAB,KEY_Q,KEY_A,KEY_F,KEY_Z,KEY_CAPS_LOCK}, + {KEY_F8,KEY_F9,KEY_8,KEY_9,KEY_0,KEY_O,KEY_L,KEY_SLASH}, + {KEY_PRINTSCREEN,KEY_SCROLL_LOCK,KEY_PAUSE,KEY_PAGE_UP,KEY_NUM_LOCK,KEY_HOME,KEY_PAGE_DOWN,KEY_INSERT}, + {KEY_F10,KEY_F11,KEY_F12,KEY_MINUS,KEY_EQUAL,KEY_I,KEY_LEFT,0}, + {KEY_F6,KEY_F7,KEY_U,KEY_H,KEY_7,KEY_J,KEY_N,KEY_PERIOD}, + {KEY_F4,KEY_4,KEY_R,KEY_5,KEY_F,KEY_V,KEY_M,KEY_MENU}, + {KEY_F5,KEY_T,KEY_6,KEY_Y,KEY_G,KEY_B,KEY_COMMA,0}, + {0,0,0,0,0,0,0,0}, // + {KEYPAD_SLASH,KEYPAD_8,KEY_END,KEYPAD_ASTERIX,KEYPAD_7,KEYPAD_9,KEYPAD_5,KEYPAD_6}, // + {0,0,0,0,0,0,0,0}, // + {0,KEY_BACKSPACE,KEY_P,KEY_LEFT_BRACE,KEY_SEMICOLON,KEY_QUOTE,KEY_K,KEY_DOWN}, + {KEY_RIGHT_BRACE,KEY_BACKSLASH,KEY_DELETE,KEY_ENTER,KEY_UP,KEY_RIGHT,KEYPAD_0,KEY_SPACE}, + {KEYPAD_4,KEYPAD_1,KEYPAD_2,KEYPAD_3,KEYPAD_MINUS,KEYPAD_PLUS,0,KEYPAD_ENTER}, + {KEY_F2,KEY_F3,KEY_3,KEY_E,KEY_D,KEY_C,0,0}, + {KEY_F1,KEY_1,KEY_2,KEY_W,KEY_9,KEY_X,KEY_S,KEYPAD_PERIOD}, + {0,0,0,0,0,0,0,0}, // + {0,0,0,0,0,0,0,0} // +}; +// Load the modifier key matrix with key names at the correct row-column location. +// A zero indicates no modifier key at that location. +int modifier[rows_max][cols_max] = { + {0,0,MODIFIERKEY_CTRL,0,MODIFIERKEY_RIGHT_CTRL,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,MODIFIERKEY_SHIFT,0,0,0,MODIFIERKEY_RIGHT_SHIFT}, + {0,0,0,0,0,0,0,0}, + {0,MODIFIERKEY_GUI,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {MODIFIERKEY_ALT,0,0,0,0,MODIFIERKEY_RIGHT_ALT,0,0}, + {0,0,0,0,0,0,MODIFIERKEY_FN,0} // actually the MODIFIERKEY_RIGHT_GUI key +}; +// Load the media key matrix with Fn key names at the correct row-column location. +// A zero indicates no media key at that location. +int media[rows_max][cols_max] = { + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {KEY_MEDIA_VOLUME_DEC,KEY_MEDIA_VOLUME_INC,0,0,0,0,0,0}, + {KEY_MEDIA_MUTE,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0}, + {0,0,0,0,0,0,0,0} +}; +// Initialize the old_key matrix with one's. +// 1 = key not pressed, 0 = key is pressed +boolean old_key[rows_max][cols_max] = { + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1}, + {1,1,1,1,1,1,1,1} +}; +// +// Define the Teensy 4.1 I/O numbers (translated from the FPC pin #) +int Row_IO[rows_max] = {0,1,10,11,12,24,25,26,27,28,29,30,31,32,36,35,34,33}; // Teensy 4.0 I/O numbers for rows +// +int Col_IO[cols_max] = {2,3,4,5,6,7,8,9}; // Teensy 4.1 I/O numbers for columns + +// Declare variables that will be used by functions +boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys +// slot 1 thru slot 6 hold the normal key values to be sent over USB. +int slot1 = 0; //value of 0 means the slot is empty and can be used. +int slot2 = 0; +int slot3 = 0; +int slot4 = 0; +int slot5 = 0; +int slot6 = 0; +// +int mod_shift_l = 0; // These variables are sent over USB as modifier keys. +int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ... +int mod_ctrl_l = 0; +int mod_ctrl_r = 0; +int mod_alt_l = 0; +int mod_alt_r = 0; +int mod_gui = 0; +// +// declare and initialize ErgoTrac variables +int x_read; // stores the reading from the X ADC +int y_read; // same for the Y ADC +char mx; // signed byte used by the Mouse.move function for x value. Positive value moves to the right +char my; // positive y value moves down +int x_delta; // signed 16 bit value gives x movement amount +int y_delta; // y version. +int x_center; //resting position of x sensor +int y_center; //resting position of y sensor +int noise_zone = 50; // dead zone around the center. +char slowdown_left = 75; // factor to slow the curser movement down going left +char slowdown_right = 60; // factor to slow the curser movement down going right +char slowdown_up = 70; // factor to slow the curser movement down going up +char slowdown_down = 75; // factor to slow the curser movement down going down +boolean left_button = 0; // on/off variable for left button, 1 = pushed +boolean right_button = 0; // on/off variable for right button, 1 = pushed +boolean old_left_button = 0; // on/off variable for left button from the previous cycle +boolean old_right_button = 0; // on/off variable for right button from the previous cycle +boolean button_change = 0; // Shows when the left or right buttons have changed, 1 = change +// +// Function to load the key name into the first available slot +void load_slot(int key) { + if (!slot1) { + slot1 = key; + } + else if (!slot2) { + slot2 = key; + } + else if (!slot3) { + slot3 = key; + } + else if (!slot4) { + slot4 = key; + } + else if (!slot5) { + slot5 = key; + } + else if (!slot6) { + slot6 = key; + } + if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) { + slots_full = LOW; // slots are not full + } + else { + slots_full = HIGH; // slots are full + } +} +// +// Function to clear the slot that contains the key name +void clear_slot(int key) { + if (slot1 == key) { + slot1 = 0; + } + else if (slot2 == key) { + slot2 = 0; + } + else if (slot3 == key) { + slot3 = 0; + } + else if (slot4 == key) { + slot4 = 0; + } + else if (slot5 == key) { + slot5 = 0; + } + else if (slot6 == key) { + slot6 = 0; + } + if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) { + slots_full = LOW; // slots are not full + } + else { + slots_full = HIGH; // slots are full + } +} +// +// Function to load the modifier key name into the appropriate mod variable +void load_mod(int m_key) { + if (m_key == MODIFIERKEY_LEFT_SHIFT) { + mod_shift_l = m_key; + } + else if (m_key == MODIFIERKEY_RIGHT_SHIFT) { + mod_shift_r = m_key; + } + else if (m_key == MODIFIERKEY_LEFT_CTRL) { + mod_ctrl_l = m_key; + } + else if (m_key == MODIFIERKEY_RIGHT_CTRL) { + mod_ctrl_r = m_key; + } + else if (m_key == MODIFIERKEY_LEFT_ALT) { + mod_alt_l = m_key; + } + else if (m_key == MODIFIERKEY_RIGHT_ALT) { + mod_alt_r = m_key; + } + else if (m_key == MODIFIERKEY_GUI) { + mod_gui = m_key; + } +} +// +// Function to load 0 into the appropriate mod variable +void clear_mod(int m_key) { + if (m_key == MODIFIERKEY_LEFT_SHIFT) { + mod_shift_l = 0; + } + else if (m_key == MODIFIERKEY_RIGHT_SHIFT) { + mod_shift_r = 0; + } + else if (m_key == MODIFIERKEY_LEFT_CTRL) { + mod_ctrl_l = 0; + } + else if (m_key == MODIFIERKEY_RIGHT_CTRL) { + mod_ctrl_r = 0; + } + else if (m_key == MODIFIERKEY_LEFT_ALT) { + mod_alt_l = 0; + } + else if (m_key == MODIFIERKEY_RIGHT_ALT) { + mod_alt_r = 0; + } + else if (m_key == MODIFIERKEY_GUI) { + mod_gui = 0; + } +} +// +// Function to send the modifier keys over usb +void send_mod() { + Keyboard.set_modifier(mod_shift_l | mod_shift_r | mod_ctrl_l | mod_ctrl_r | mod_alt_l | mod_alt_r | mod_gui); + Keyboard.send_now(); +} +// +// Function to send the normal keys in the 6 slots over usb +void send_normals() { + Keyboard.set_key1(slot1); + Keyboard.set_key2(slot2); + Keyboard.set_key3(slot3); + Keyboard.set_key4(slot4); + Keyboard.set_key5(slot5); + Keyboard.set_key6(slot6); + Keyboard.send_now(); +} +// Function to set a pin to high impedance (acts like open drain output) +void go_z(int pin) +{ + pinMode(pin, INPUT); +} +// +// Function to set a pin as an input with a pullup +void go_pu(int pin) +{ + pinMode(pin, INPUT_PULLUP); + digitalWrite(pin, HIGH); +} +// +// Function to send a pin to a logic low +void go_0(int pin) +{ + pinMode(pin, OUTPUT); + digitalWrite(pin, LOW); +} +// +// Function to send a pin to a logic high +void go_1(int pin) +{ + pinMode(pin, OUTPUT); + digitalWrite(pin, HIGH); +} +// +// Function to re-capture the at-rest X & Y ADC values +void recenter(void) { + digitalWrite(ErgoTrac_Ref, LOW); // resting state of reference + delay(25); // wait before sending calibration pulse + digitalWrite(ErgoTrac_Ref, HIGH); // Send calibration pulse high + delayMicroseconds(400); // wait before reading ADC to allow for rise time + x_center = analogRead(ErgoTrac_X); // store the center (no movement) value for x + y_center = analogRead(ErgoTrac_Y); // same for y + delayMicroseconds(50); // wait before releasing calibration pulse + digitalWrite(ErgoTrac_Ref, LOW); // Send calibration pulse back to resting state +} +// ************************************Begin Routine********************************************************* +void setup() +{ + delay(2000); // wait to let things settle out + analogReadRes(12); // ADC has 10 usable bits but set resolution to the full 12 bits + analogReadAveraging(8); // ADC will take the average of multiple reads to filter noise. + pinMode(ErgoTrac_Ref, OUTPUT); // define Teensy I/O that drives the refernce pulses to the ErgoTrac + recenter(); // capture the at-rest X and Y position + for (int a = 0; a < cols_max; a++) { // loop thru all column pins + go_z(Col_IO[a]); // set each column pin as an input without a pullup + } +// + for (int b = 0; b < rows_max; b++) { // loop thru all row pins + go_z(Row_IO[b]); // set each row pin as a floating output + } + delay(25); // wait 25ms before entering main loop +} +boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed" +extern volatile uint8_t keyboard_leds; // 8 bits sent from Host to Teensy that give keyboard LED status. Caps lock is bit D1. + +// +// ************************************Main Loop*************************************************************** +void loop() { +// ******************************************Keyboard********************************************************** +// + elapsedMillis loop_timer; // zero the loop timer. Timer is used at the end of the loop to determine when to repeat +// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups). +// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan +// that was 30msec ago. The status of a key that was just pressed or just released is sent over USB and the state is saved in the old_key matrix. +// The keyboard keys will read as logic low if they are pressed (negative logic). +// The old_key matrix also uses negative logic (low=pressed). +// + for (int x = 0; x < rows_max; x++) { // loop thru the rows + go_0(Row_IO[x]); // Activate Row (send it low) + delayMicroseconds(50); // give the row time to go low and settle out + for (int y = 0; y < cols_max; y++) { // loop thru the columns +// **********Modifier keys including the Fn special case + if (modifier[x][y] != 0) { // check if modifier key exists at this location in the array (a non-zero value) + if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // Read column to see if key is low (pressed) and was previously not pressed + if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key + load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable + send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed + old_key[x][y] = LOW; // Save state of key as "pressed" + } + else { + Fn_pressed = LOW; // Fn status variable is active low + old_key[x][y] = LOW; // old_key state is "pressed" (active low) + } + } + else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed and was previously pressed + if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key + clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable + send_mod(); // function sends all mod's over usb including the one that just released + old_key[x][y] = HIGH; // Save state of key as "not pressed" + } + else { + Fn_pressed = HIGH; // Fn is no longer active + old_key[x][y] = HIGH; // old_key state is "not pressed" + } + } + } +// ***********end of modifier section +// +// ***********Normal keys and media keys in this section + else if ((normal[x][y] != 0) || (media[x][y] != 0)) { // check if normal or media key exists at this location in the array + if (!digitalRead(Col_IO[y]) && (old_key[x][y]) && (!slots_full)) { // check if key is pressed and was not previously pressed and slots not full + old_key[x][y] = LOW; // Save state of key as "pressed" + if (Fn_pressed) { // Fn_pressed high means it's not pressed +// **** Special case for Scroll Lock and Pause which are used by Ergotrac as left and right mouse buttons + if(normal[x][y] == KEY_SCROLL_LOCK) { + left_button = 1; // set the left button + } + else if(normal[x][y] == KEY_PAUSE) { + right_button = 1; // set the right button + } +// All the other normal keys are sent + else { + load_slot(normal[x][y]); //update first available slot with normal key name + send_normals(); // send all slots over USB including the key that just got pressed + } + } + else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix + Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC + //delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB + delayMicroseconds(300); + Keyboard.release(media[x][y]); // send media key release + } + + else if (normal[x][y] == KEY_F11) { // Fn is active and F11 is pressed - recapture TP center + recenter(); // recapture the at-rest X and Y position + } + else if (normal[x][y] == KEY_F10) { // Fn is active and F10 is pressed - increase noise zone value by 5 + noise_zone = noise_zone + 5; + } + else if (normal[x][y] == KEY_F9) { // Fn is active and F9 is pressed - decrease noise zone value by 5 + noise_zone = noise_zone - 5; + } + else if (normal[x][y] == KEY_F8) { // Fn is active and F8 is pressed + slowdown_left = slowdown_left - 5; // decrease all slowdown values by 5 + slowdown_right = slowdown_right - 5; + slowdown_up = slowdown_up - 5; + slowdown_down = slowdown_down - 5; + } + else if (normal[x][y] == KEY_F7) { // Fn is active and F7 is pressed + slowdown_left = slowdown_left + 5; // increase all slowdown values by 5 + slowdown_right = slowdown_right + 5; + slowdown_up = slowdown_up + 5; + slowdown_down = slowdown_down + 5; + } + else if (normal[x][y] == KEY_F6) { // Fn is active and F6 is pressed + noise_zone = 50; // Set noise zone and slowdowns to default values + slowdown_left = 75; // movement left needs more slowdown for some reason + slowdown_right = 60; + slowdown_up = 70; + slowdown_down = 75; + } + else if (normal[x][y] == KEY_F5) { // Fn is active and F5 is pressed + if (noise_zone >= 1000) { // toggle back to normal or huge (off) value + noise_zone = 50; // back to start up value + } + else { + noise_zone = 5000; // huge noise zone won't allow cursor movement + } + } + + + } + else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed + old_key[x][y] = HIGH; // Save state of key as "not pressed" + if (Fn_pressed) { // Fn is not pressed + +// **** Special case for releazse of Scroll Lock or Pause (left and right mouse buttons) + if(normal[x][y] == KEY_SCROLL_LOCK) { + left_button = 0; // clear the left button + } + else if(normal[x][y] == KEY_PAUSE) { + right_button = 0; // clear the right button + } +// All the other normal keys are released + else { + clear_slot(normal[x][y]); //clear the slot that contains the normal key name + send_normals(); // send all slots over USB including the key that was just released + } + } + } + } +// **************end of normal and media key section +// + } + go_z(Row_IO[x]); // De-activate Row (send it to hi-z) + } +// +// **********keyboard scan complete +// +// ****************************************LEDs******************** +// Turn on the LEDs for Caps and Num Lock based on the keyboard_leds variable controlled by the USB host computer +// CAPS LOCK + if (keyboard_leds & 1<<1) { // mask off all bits but D1 and test if set + go_1(CAPS_LED); // turn on the LED + } + else { + go_0(CAPS_LED); // turn off the LED + } +// NUM LOCK + if (keyboard_leds & 1) { // mask off all bits but D0 and test if set + go_1(NUM_LED); // turn on the LED + } + else { + go_0(NUM_LED); // turn off the LED + } +// +// ********************Ergotrac************************************************************************************* +// + digitalWrite(ErgoTrac_Ref, HIGH); // send calibration reference pulse +// + mx = 0; // for each loop, start with zero and update only if movement detected + my = 0; // same for y +// Read the ADC's + x_read = analogRead(ErgoTrac_X); // read the ADC tied to the X sensor + y_read = analogRead(ErgoTrac_Y); // read the ADC tied to the Y sensor +// Check if X or Y movement is beyond the dead zone + if ((x_read > (x_center + noise_zone)) || (x_read < (x_center - noise_zone)) || (y_read > (y_center + noise_zone)) || (y_read < (y_center - noise_zone))) { +// Only do the following if at least one reading is beyond the dead zone. +// Figure out if the X value is to the right or the left of the center resting value + if (x_read > x_center) { // is X ADC to the right of the resting position? + x_delta = (x_read - x_center) / slowdown_right; // find out how far beyond center. Divide it to slow it down. + mx = byte(x_delta); // convert signed 16 bit to signed 8 bit + } + else { // X ADC is equal or to the left of the resting position + x_delta = ((x_center - x_read) / slowdown_left) * -1; // Answer should be negative so multiply by -1 + mx = byte(x_delta); // convert signed 16 bit to signed 8 bit + } +// Figure out if the Y value is above or below the center resting value + if (y_read > y_center) { // is Y ADC above the resting position? + y_delta = ((y_read - y_center) / slowdown_down) * -1; // up movement is negative for Mouse.move function + my = byte(y_delta); // convert signed 16 bit to signed 8 bit + } + else { // Y ADC is equal or below the resting position + y_delta = (y_center - y_read) / slowdown_up; + my = byte(y_delta); // convert signed 16 bit to signed 8 bit + } + } +// send the x and y data over usb if either one is not at center position + if ((mx != 0x00) || (my != 0x00)) { + Mouse.move(mx,my); + } + digitalWrite(ErgoTrac_Ref, LOW); // release calibration reference + +// Mouse buttons (Scroll Lock and Pause keys) +// +// Determine if the buttons have changed (using XOR) since the last cycle + button_change = ((left_button ^ old_left_button) | (right_button ^ old_right_button)); +// Don't send button status if there's no change since last time + if (button_change){ + Mouse.set_buttons(left_button,0, right_button); // send button status over USB + } + old_left_button = left_button; // remember button status for the next cycle + old_right_button = right_button; +// + delay(20); // wait before repeating +}