1 | #include <Keyboard.h>
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2 | int dataPin = 9;
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3 | int clockPin = 7;
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4 | int latchPin = 8;
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5 |
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6 | unsigned long last_press = 0;
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7 | unsigned long last_key_press = 0;
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8 |
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9 | char* letters[] ={"dcbahgfe" };
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10 |
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11 | int num_chars = 43;
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12 | int num_registers = 1;
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13 | byte button_states[] = {0x00,0x00,0x00,0x00}; //01001000
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14 | int cursor_index = 0;
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15 | int char_index = 0;
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16 | char cur_char = 'X';
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17 |
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18 | void setup() {
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19 | Serial.begin(9600);
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20 | pinMode(latchPin, OUTPUT);
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21 | pinMode(clockPin, OUTPUT);
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22 | pinMode(dataPin, INPUT);
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23 | Keyboard.begin();
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24 |
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25 | }
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26 |
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27 | void loop() {
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28 | if (millis() - last_key_press > 350) read_keyboard();
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29 | delay(1);
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30 | }
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31 |
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32 |
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33 | void read_keyboard(){
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34 | //set it to 0 to transmit data serially
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35 | digitalWrite(latchPin,LOW);
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36 | //while the shift register is in serial mode
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37 | //collect each shift register into a byte
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38 | //the register attached to the chip comes in first
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39 | for (int i = 0; i < num_registers; i++){
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40 | button_states[i] = shiftIn(dataPin, clockPin);
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41 | }
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42 | boolean something_in = false;
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43 | for (int i = 0; i < num_registers; i++){
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44 | something_in = translate_buttons_2_keys(button_states[i], letters[i]);
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45 | if (something_in) last_key_press = millis();
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46 | }
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47 | digitalWrite(latchPin,HIGH);
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48 | }
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49 |
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50 | boolean translate_buttons_2_keys(byte buttons, char* keys){
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51 | for(int i = 0 ; i < 8; i++){
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52 | if ( (1 << i) & buttons ){
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53 | cur_char = keys[i];
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54 | Keyboard.print(keys[i]);
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55 | char_index++;
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56 | return true;
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57 | }
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58 | }
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59 | return false;
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60 | }
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61 | byte shiftIn(int myDataPin, int myClockPin) {
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62 | int i;
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63 | int temp = 0;
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64 | int pinState;
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65 | byte myDataIn = 0;
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66 |
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67 | pinMode(myClockPin, OUTPUT);
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68 | pinMode(myDataPin, INPUT);
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69 |
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70 | for (i=7; i>=0; i--)
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71 | {
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72 | digitalWrite(myClockPin, 0);
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73 | delayMicroseconds(20);
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74 | temp = digitalRead(myDataPin);
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75 | if (temp) {
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76 | pinState = 1;
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77 | myDataIn = myDataIn | (1 << i);
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78 | }
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79 | else {
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80 | pinState = 0;
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81 | }
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82 | digitalWrite(myClockPin, 1);
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83 | }
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84 | return myDataIn;
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85 | }
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