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标题: SD卡無法錄入訊息 [打印本页]

作者: wawafishg 时间: 2025-5-27 14:10
标题: SD卡無法錄入訊息

#include <Wire.h>          // I²C的標準libriry
#include <Adafruit_SHT31.h>  //SHT31的librirry
#include <ArduinoJson.h>
#include <BH1750.h>
// // [Mega2560]

// -USB (UART0) → 筆電 (地面站)
// -I²C (20/21) → SHT31, BH1750
// -SPI (50/51/52/CS53) → micro-SD
//  預計執行結果包成json檔
//  {"time_ms":4257,"temp_c":25.13,"hum_pct":56.90}
//  {"time_ms":6257,"temp_c":25.12,"hum_pct":56.91}

const uint32_t SERIAL_BAUD = 9600;
const uint16_t PERIOD_MS = 2000;
const size_t JSON_CAP = 128;
const int SD_CS_PIN = 53;

// SD 卡選項

#include <SPI.h>
#include <SD.h>

File logFile;       // CSV 紀錄檔

/*
#include <mcp_can.h>
MCP_CAN CAN0(10);                // MCP2515 模組 CS=10
void canSend(float tmp, float hum) {
  byte buf[8];
  memcpy(buf, &tmp, 4);
  memcpy(buf + 4, &hum, 4);
  CAN0.sendMsgBuf(0x301, 0, 8, buf);
}
*/

Adafruit_SHT31 sht31 = Adafruit_SHT31();
BH1750 lightMeter;
BH1750 LightSensor;
String sensorMode="BH";
bool enableSD = 1;

void setup() {
  Serial.begin(SERIAL_BAUD);
  while (!Serial) { ; }
  Wire.begin();

  // 初始化 SHT31 or BH1750
  if (sensorMode == "SHT"){

Serial.println(F("=== SHT31 JSON Demo Boot ==="));
if (!sht31.begin(0x44)) {
   Serial.println(F("[ERR] 找不到 SHT31，請檢查 SDA/SCL！"));
   while (1)
      ;  // 卡住，等人來救
}
  } else if(sensorMode == "BH"){
Serial.println(F("=== BH1750 JSON Demo Boot ==="));
lightMeter.begin();
LightSensor.begin();
Serial.println(F("BH1750 Test begin"));
  } else {
Serial.println(F("Sensor Function Disabled"));

  }

  Serial.println(F("Sensor OK，開始輸出 JSON"));

  //SD 卡初始化
  if (enableSD){
Serial.print("Initializing SD card...");
pinMode(53, OUTPUT);
if (!SD.begin(SD_CS_PIN)) {
   Serial.println("initialization failed!");
   while (1)
      ;
}
Serial.println("initialization done.");

logFile = SD.open("telemetry.txt", FILE_WRITE);
if (logFile) {
   Serial.print("Writing header to telemetry.txt...");
   logFile.println(F("epoch_ms,tempC,humPct"));
   logFile.flush();
   logFile.close();

   Serial.println(F("[SD] ready"));
} else {
   // if the file didn't open, print an error:
   Serial.println("error opening telemetry.txt when setup");
}
  } else {
Serial.println("SD card function unenabled");

  }

  //CAN-Bus 初始化
  /*
  if (CAN0.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ) == CAN_OK) {
Serial.println(F("[CAN] init OK"));
  } else {
Serial.println(F("[ERR] CAN init fail"));
  }
  */
}

void loop() {
  static unsigned long last = 0;
  const unsigned long now = millis();

  if (now - last >= PERIOD_MS) {
last = now;

//讀取溫溼度 for SHT
float tempC;
float hum;

// Read Light level and sensor for BH
uint16_t lux;
uint16_t lux2;

StaticJsonDocument<JSON_CAP> doc;

if( sensorMode == "SHT"){
   //送溫溼度　JSON
   tempC = sht31.readTemperature();
   hum = sht31.readHumidity();

   doc["time_ms"] = now;  // 一旦開機就開始計算秒數
   doc["temp_c"] = tempC;
   doc["hum_pct"] = hum;
} else if (sensorMode == "BH") {
   // BH Json output (光照)
   lux = lightMeter.readLightLevel();
   lux2 = LightSensor.readLightLevel();
   doc["time_ms"] = now;  // 一旦開機就開始計算秒數    doc["lightlvl"] = lux;
   doc["lightsnsr"] = lux2;
} else {
   Serial.println("Sensor Function Disabled, empty output:");

}
serializeJson(doc, Serial);
Serial.println();  // 用換行作為封包邊界

if(enableSD){
   //SD 卡記錄 (CSV)
   logFile = SD.open("telemetry.txt", FILE_WRITE);
   if (logFile) {
      Serial.print("Writing new data to telemetry.txt...");

      logFile.print(now);
      logFile.print(',');
      logFile.print(tempC, 2);
      logFile.print(',');
      logFile.println(hum, 2);
      logFile.flush();  // 立即寫盤避免斷電遺失
      logFile.close();
   } else {
      // if the file didn't open, print an error:
      Serial.println("error opening telemetry.txt when writing");
   }

   // SD card read
   logFile = SD.open("telemetry.txt");
   if (logFile) {
      Serial.println("telemetry.txt:");
      while (logFile.available()) {
      Serial.write(logFile.read());
      }
   } else {
      // if the file didn't open, print an error:
      Serial.println("error opening telemetry.txt when read");
   }
}

/* ③ CAN-Bus 廣播 ── */
/*
canSend(tempC, hum);             // 0x301：TCS 遙測
*/
  }
}

各位前輩好，我在使用SD卡紀錄BH1750的資訊時遇到了無法創建檔案(程式碼中寫的telemetry.txt)的問題，其中輸出
Initializing SD card...initialization done.
error opening telemetry.txt when setup

想請問怎麼解決，並且也想知道問題原因

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