🔹MFRC522 腳位接線 | |
|---|---|
| SDA (SS) | D10 |
| SCK | D13 |
| MOSI | D11 |
| MISO | D12 |
| RST | D9 |
| 3.3V | 3.3V |
| GND | GND |
⚠️ 注意：MFRC522 只能接 3.3V，不要接 5V。
🔹 蜂鳴器接線
| 正極 (+) | D8 |
| 負極 (–) | GND |
#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN 9 // 重置腳位
#define SS_PIN 10 // SDA 腳位
#define BUZZER_PIN 8 // 蜂鳴器腳位
MFRC522 mfrc522(SS_PIN, RST_PIN); // 建立 RFID 物件
// 授權卡片 UID
byte birthdayUID[4] = {224, 202, 33, 16};
byte twinkleUID[4] = {99, 101, 39, 254};
// 生日快樂歌音符
int birthdayMelody[] = {
262, 262, 294, 262, 349, 330,
262, 262, 294, 262, 392, 349,
262, 262, 523, 440, 349, 330, 294,
466, 466, 440, 349, 392, 349
};
int birthdayDurations[] = {
250, 250, 500, 500, 500, 1000,
250, 250, 500, 500, 500, 1000,
250, 250, 500, 500, 500, 500, 1000,
250, 250, 500, 500, 500, 1000
};
// 小星星音符
int twinkleMelody[] = {
262, 262, 392, 392, 440, 440, 392,
349, 349, 330, 330, 294, 294, 262
};
int twinkleDurations[] = {
500, 500, 500, 500, 500, 500, 1000,
500, 500, 500, 500, 500, 500, 1000
};
void setup() {
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
pinMode(BUZZER_PIN, OUTPUT);
Serial.println("請將卡片靠近讀卡器...");
}
void loop() {
if (!mfrc522.PICC_IsNewCardPresent()) return;
if (!mfrc522.PICC_ReadCardSerial()) return;
Serial.print("卡片 UID (10進位): ");
for (byte i = 0; i < mfrc522.uid.size; i++) {
Serial.print(mfrc522.uid.uidByte[i], DEC);
Serial.print(" ");
}
Serial.println();
if (compareUID(mfrc522.uid.uidByte, birthdayUID)) {
Serial.println("授權卡片 → 播放生日快樂歌");
playSong(birthdayMelody, birthdayDurations, sizeof(birthdayMelody)/sizeof(int));
} else if (compareUID(mfrc522.uid.uidByte, twinkleUID)) {
Serial.println("授權卡片 → 播放小星星");
playSong(twinkleMelody, twinkleDurations, sizeof(twinkleMelody)/sizeof(int));
} else {
noTone(BUZZER_PIN);
Serial.println("非授權卡片 → 不播放");
}
mfrc522.PICC_HaltA();
}
// 比對 UID
bool compareUID(byte *uid, byte *target) {
for (byte i = 0; i < 4; i++) {
if (uid[i] != target[i]) return false;
}
return true;
}
// 播放歌曲
void playSong(int melody[], int durations[], int length) {
for (int i = 0; i < length; i++) {
tone(BUZZER_PIN, melody[i], durations[i]);
delay(durations[i] * 1.3);
}
noTone(BUZZER_PIN);
}
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