It also makes the code easier to read and understand. TIP: Factor code for the compiler to process chains of Arduino if else code. For example the trivial code above could be re-written as: static int command=0; void d_action(void) { Serial.println("data"); command = 1; } void b...
else if (x >= 2) { // 执行B } else { // 执行C } 说明:某个测试条件为真,关联的代码块就会执行,程序将跳到结构的下一行。如果没有测试被验证为真。缺省的else语句块,被设为默认行为,并执行。 3.for语句 结构:for (初始化部分; 条件判断部分; 数据递增部分) { //语句块 } 举例:for(int x ...
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The code above calls function S1(). If the switch on DP2 is open it returns 0 or false - thus "else" is executed and LED1 is turned OFF. LED1 is only ON while S1 is pressed by returning a 1 when called. void loop() { delay(100); if ( S1() ) digitalWrite(LED1, 1); if...
Learn the fundamentals of conditional statements in programming including if, if-else, and if-else-if statements. Understand how these statements can be used to make your program very powerful and be able to be used for a vast variety of purposes.
StatusCode status;byte buffer[18];byte size=sizeof(buffer);// 原来的数据Serial.println(F("显示原本的数据..."));status=(MFRC522::StatusCode)mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A,trailerBlock,&key,&(mfrc522.uid));if(status!=MFRC522::STATUS_OK){Serial.print(F(...
unsigned long currentMillis = millis(); if (currentMillis - previousMillis >= interval) { // save the last time you blinked the LED previousMillis = currentMillis; // if the LED is off turn it on and vice-versa: if (ledState == LOW) { ledState = HIGH; } else { ledState = ...
Arduino IDE是官方提供的编程环境,编写代码,上传到arduino。支持windows, linux, mac。官网下载https://www.arduino.cc/en/software 此外,还有一些图形化编程环境,如米思齐mixly,通过拖拽积木块的形式编程,界面对初学者更友好。https://mixly.org/ 3. 示例程序 ...
// SPI or QSPI flash filesystem (i.e. CIRCUITPY drive) #if defined(__SAMD51__) || defined(NRF52840_XXAA) Adafruit_FlashTransport_QSPI flashTransport(PIN_QSPI_SCK, PIN_QSPI_CS, PIN_QSPI_IO0, PIN_QSPI_IO1, PIN_QSPI_IO2, PIN_QSPI_IO3); #else #if (SPI_INTERFACES_COUNT == 1...
// set the data rate for the sensor serial port finger.begin(57600); if (finger.verifyPassword()) { Serial.println("Found fingerprint sensor!"); } else { Serial.println("Did not find fingerprint sensor "); while (1) { delay(1); ...