http://www.arduino.cc/en/Tutorial/ButtonStateChange */ // this constant won't change: 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; //...
状态变化检测(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 another. For example, you want to know when a button goes from OFF to ON. This is called state change detection, or...
/* * 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...
digitalWrite(ledPin, ledState); } } [Get Code] 更多 setup() loop() millis() 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...
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 5.3.5Fading 5.3.6Smoothing 第6章Arduino扩展板 ...
36、 /黑线在右边 right(1); Serial.print(state=); Serial.print(t); Serial.println( |Right); temp=t; break; case 100: /黑线在右边两个传感器 right(1); Serial.print(state=); Serial.print(t); Serial.println( |Right); temp=t; break; case 101: /黑线在中间 advance(1); Serial.print...
Next time through the loop, // it'll be the 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 ...
State definitions */ enum { NOTAVAILABLE_STATE, NEAR_STATE, FAR_STATE, ALL_STATE }; #ifdef _AVR_IO_H_ // Do not use this alias as it's deprecated #define NA_STATE NOTAVAILABLE_STATE #endif /* APDS9930 Class */ class APDS9930 { public: /* Initialization methods */ APDS9930(); ...
The I state should converge to the exact heater output needed for the target temperature. To prevent a long deviation from the target zone, this value limits the lower value. A good start is 30 lower then the optimal value. You need to leave room for cooling. Overridden if EEPROM ...
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 ...