从程序看该引脚已配置成输入，因此，这个引脚本身无所谓开关，只是根据这个引脚的逻辑状态去控制LED的开关。
pinMode(buttonPin, INPUT);} void loop() { buttonState = digitalRead(buttonPin);if (buttonState == HIGH) { digitalWrite(ledPin, HIGH);} else { digitalWrite(ledPin, LOW);} } 逐行分解，这段代码的功能如下：将这个代码所要使用的两个接口数值保存在常量内 const int buttonPin = 2;const int ...
const int buttonPin = 2; const int ledPin = 13; int ledState = HIGH; int buttonState; int lastButtonState = LOW; unsigned long lastDebounceTime = 0; unsigned long debounceDelay = 50; void setup() { pinMode(buttonPin, INPUT); pinMode(ledPin, OUTPUT); digitalWrite(ledPin, ledState);...
It provides a simple way to measure signal periods on any pin. There are in fact two versions of the function explored below (pulseIn and pulseInLong) one uses interrupts and one is coded in assembler. Note: PulseIn measures the high or low time period while a signal continuously repeats,...
If the pin has been configured as an OUTPUT with pinMode(), its voltage will be set to the corresponding value: 5V (or 3.3V on 3.3V boards) for HIGH, 0V (ground) for LOW. 如果引脚被设置为INPUT,digitalWrite()会激活输入引脚的上拉电阻。
pinMode(ledPin, OUTPUT); // 设置引脚模式为输出模式 void loop() { digitalWrite(ledPin, HIGH); // 点亮 LED 灯 delay(1000); // 等待一秒 digitalWrite(ledPin, LOW); // 熄灭 LED 灯 delay(1000); // 等待一秒 // 声明 LED 灯连接的引脚号 int ledPin = 13;// 设置...
9.8 |= (compound bitwise or) 变量部分 十、常量 10.1 HIGH|LOW(引脚电压定义) 10.2 INPUT|OUTPUT(数字引脚(Digital pins)定义) 10.3 true | false(逻辑层定义) 10.4 integer constants(整数常量) 10.5 floating point constants(浮点常量) 十一、数据类型 ...
pinMode(inpin,INPUT);//定义按键接口为输入接口 } void loop() { val=digitalRead(inpin);//读取数字7 口电平值赋给val if(val==HIGH)//检测按键是否按下,按键按下时小灯亮起 { digitalWrite(ledpin,HIGH);} else { digitalWrite(ledpin,LOW);} ...
在 Arduino 程序中，digitalWrite(LEDpin, state) 是一个函数，用于将电平写入数字引脚。该函数有两个参数：- LEDpin：数字引脚的编号。- state：布尔值，表示要写入的电平。如果 state 为 HIGH，则表示将高电平写入引脚；如果 state 为 LOW，则表示将低电平写入引脚。因此，digitalWrite(LEDpin, state...
pinMode(LED_BUILTIN, OUTPUT); digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(500); // wait for a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW