const int buttonPin = 2; // the pin that the pushbutton is attached to const int ledPin = 13; // the pin that the LED is attached to // Variables will change: int buttonPushCounter = 0; // counter for the number of button presses int buttonState = 0; // current state of the...
Often, you don't need to know the state of a digital input all the time, but you just need to know when the input changes from one state to another. For example, you want to know when a button goes from OFF to ON. This is called state change detection, or edge detection. 通常,...
/* * State change detection: 检测按键按下的状态并累计次数 */ // 定义端口 const int ledPin = 13; const int buttonPin = 2; // 设置变量 int currentButtonState = 0; int lastButtonState = 0; int count = 0; void setup() { // 初始化端口 pinMode(ledPin, OUTPUT); pinMode(buttonPin...
Button - 用一个按钮来控制LED灯 Debounce - 读取一个按钮,并滤掉噪音 DigitalInputPullup - 示范怎么用pinMode()来上拉引脚 StateChangeDetection - 记录按键按下的次数 toneKeyboard - 一个用压力传感器和压电扬声器的三键音乐键盘 toneMelody - 用压电扬声器弹奏一个旋律 toneMultiple - 用tone()命令在多个扬声...
* Reset the button state machine. */ void reset(void); /* * return number of clicks in any case: single or multiple clicks */ int getNumberClicks(void); /** * @return true if we are currently handling button press flow * (This allows power sensitive applications to know when it is...
5.2.2Button 5.2.3Debounce 5.2.4DigitalInputPullup 5.2.5StateChangeDetection 5.2.6toneKeyboard 5.2.7toneMelody 5.2.8toneMultiple 5.2.9tonePitchFollower 5.3模拟信号处理开发例程 5.3.1AnalogInOutSerial 5.3.2AnalogInput 5.3.3AnalogWriteMega 5.3.4Calibration ...
lastButtonState: lastButtonState = reading; } 项目九材料清单 按三下按键点亮 LED ? ? ? /* State change detection (edge detection 边缘检测) Often, you don't need to know the state of a digital input all the time,but you just need to know when the input changes from one state to ...
Change the baud rate to match your preferences or leave it. Make sure the printer is connected and port and board type are set correctly. Press the upload button. That is the button with the arrow to the right. After a while you see the length of the compiled firmware file and the ...
pinMode(buttonPin, INPUT);将按钮定义为输入单位。 buttonState = digitalRead(buttonPin);描述: 从指定的数字引脚读取数值,HIGH或LOW. 语法: digitalRead(pin) 变量: pin(引脚): 你想要读取的Arduino的 pin(引脚)。 该功能用于读取数字引脚的状态,即高电平(HIGH)还是低电平(LOW)。 按下按钮时,状态为高电平,...
state change detection, or edge detection. 常常不要一直知道数字输入的状态,但是需要知道何时状态发生了改变。例如:需要知道按钮在什么时候从断开 OFF 变为关闭 ON。这就叫做状态监测,或者边沿检测。 This example shows how to detect when a button or button changes from off to on ...