Write to file using FileIO classes. This sketch demonstrate how to write file into the Yún101/YunShield/Yún filesystem. A shell script file is created in /tmp, and it is executed afterwards. created 7 June 2010 by Cristian Maglie This example code is in the public domain. http://www...
在setup()里,用SD.open()打开一个名为"example.txt"的新文件。FILE_WRITE使能对文件进行读写访问,结束时开始。在这个例子中,通过调用myFile.close()来立即关闭该文件。 用SD.exists()检查确认文件存在后,用SD.remove从SD卡里删除文件。 /* SD card basic file example This example shows how to create and...
该read()函数实际上一次只读取一个字符,因此,我们需要使用“ while”循环和该函数myFile.available()来读取文件中的所有字符。最后,我们需要关闭文件。 myFile = SD.open("test.txt"); if (myFile) { Serial.println("test.txt:"); while (myFile.available()) { Serial.write(myFile.read()); } myF...
file.write((uint8_t*)data, strlen(data)); file.close();//重命名文件if(SD_MMC.rename("/test.txt","/retest.txt")) { Serial.println("test.txt 重命名为 retest.txt !"); }//读取文件数据file = SD_MMC.open("/retest.txt", FILE_READ);if(file) { Serial.print("文件内容是:");whil...
// Create/Open file myFile = SD.open("test.txt", FILE_WRITE); // if the file opened okay, write to it: if (myFile) { Serial.println("Writing to file..."); // Write to file myFile.println("Testing text 1, 2 ,3..."); ...
file.write("Hello, Arduino!") # 关闭文件 file.close() 使用Arduino读取文件时,可以使用Serial库中的Serial.read()函数来读取串口数据。以下是一个示例代码,演示如何使用Arduino读取文件: 代码语言:txt 复制 void setup() { // 初始化串口通信 Serial.begin(9600); ...
File dataFile=SD.open("datalog.txt",FILE_WRITE); //打开文件并将DHT11检测到的数据写入文件 if(dataFile) { dataFile.print(DHT11.humidity); dataFile.print(","); dataFile.print(DHT11.temperature); dataFile.print(","); dataFile.println(light); ...
;myFile = SD.open(example.txt, FILE_WRITE);/打开example.txt,如果没有自动创建,写入状态myFile.close();/关闭文件if (SD.exists(example.txt) Serial.println(example.txt exists.);else Serial.println(example.txt doesnt exist.);Serial.println(Removing example.txt.);SD.remove(ex 12、ample.txt);...
File imgFile = SD.open(filename, FILE_WRITE); // 获取图像文件大小 uint16_t jpglen = cam.frameLength(); Serial.print("Storing "); Serial.print(jpglen, DEC); Serial.print(" byte image."); int32_t time = millis(); pinMode(8, OUTPUT); ...
# file.write(str(TVOC) + '\n') # file.write(str(time1) + '\n') bytes_data = arduino.readline() string_data = bytes_data.decode('gbk') print(str(string_data)) count = count + 1 if count >= 5: try: values = re.finditer(r'\d+', string_data) #获取字符串中的数字 ...