1. #include "BluetoothSerial.h"
3. BluetoothSerial SerialBT;
5. String MACadd = "28:CD:**:**:51:B6";//カート側マイコンのMACアドレスを記入
6. uint8_t address[6] = {0x28, 0xCD, 0x**, 0x**, 0x51, 0xB6};
7. bool connected;
9. #define modeSW 16 // AutoStop/ManualStop
10. char key;
11. int modeSWState = 1;
12. const byte ROWS = 4; //four rows
13. const byte COLS = 4; //four columns
14. char keys[ROWS][COLS] = {
15.   {'1', '2', '3', 'A'},
16.   {'4', '5', '6', 'B'},
17.   {'7', '8', '9', 'C'},
18.   {'*', '0', '#', 'D'}
19. };
20. byte rowPins[ROWS] = {13, 12, 14, 27}; //connect to the row pinouts of the keypad
21. byte colPins[COLS] = {26, 25, 33, 32}; //connect to the column pinouts of the keypadchar key;
23. void setup() {
24.   Serial.begin(115200);
25.   
26.   SerialBT.begin("MWC_BT", true);
27.   Serial.println("device start");
28.   connected = SerialBT.connect(address);
29.   if (connected) {
30.     Serial.println("Connect OK");
31.   } else {
32.     while (!SerialBT.connected(10000)) {
33.       Serial.println("No connect");
34.     }
35.   }
37.   if (SerialBT.disconnect()) {
38.     Serial.println("Disconnected Succesfully!");
39.   }
40.   SerialBT.connect();
42.   for (byte i = 0; i < ROWS; i++) {
43.     pinMode(rowPins[i], INPUT_PULLUP);
44.   }
45.   for (byte i = 0; i < COLS; i++) {
46.     pinMode(colPins[i], OUTPUT);
47.   }
48.   pinMode(modeSW, INPUT_PULLUP);
49. }
51. void loop() {
52.   modeSWState = digitalRead(modeSW);
53.   if (modeSWState == HIGH) {
54.     key = getKey();
55.     if (key) {
56.     } else {
57.       key = 'S';
58.     }
59.     Serial.println(key);
60.     SerialBT.write(key);
61.   } else{
62.     key = getKey();
63.     if (key) {
64.       Serial.println(key);
65.       SerialBT.write(key);
66.     }
67.   }
68.   delay(20);
69. }
71. char getKey() {
72.   for (byte c = 0; c < COLS; c++) {
73.     digitalWrite(colPins[c], LOW);
74.     for (byte r = 0; r < ROWS; r++) {
75.       if (digitalRead(rowPins[r]) == LOW) {
76.         digitalWrite(colPins[c], HIGH);
77.         delay(50);
78.         return keys[r][c];
79.       }
80.     }
81.     digitalWrite(colPins[c], HIGH);
82.   }
83.   return 0;
84. }