pinMode(BUTTON_PIN, INPUT_PULLUP); } voidloop(){ Serial.println(digitalRead(BUTTON_PIN)); delay(10); } If you run this code and open the Serial Plotter, you’ll see that the default value is 1 (HIGH). When you press the button the state directly goes to 0 (LOW) and comes back...
http://www.arduino.cc/en/Tutorial/InputPullupSerial This example code is in the public domain */ void setup() { //start serial connection Serial.begin(9600); //configure pin2 as an input and enable the internal pull-up resistor pinMode(2, INPUT_PULLUP); pinMode(13, OUTPUT); } void...
pinMode(13,INPUT_PULLUP);//光电开关信号输入引脚 13 且设置为上拉模式pinMode(12,INPUT_PULLUP);sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins); //初始化数码管}void loop() {float numToShow;while(digitalRead(13) == LOW)//判断13号引脚是否为低电平 是 就不断循环括号内函数 ...
pinMode(pin,INPUT);// 将引脚设置为INPUT模式digitalWrite(pin,HIGH);// 打开引脚的上拉电阻 1. 2. 而目前应该这样写 pinMode(pin,INPUT_PULLUP); 1. 特别提示: 13号引脚相比其他引脚来说不适宜配置为INPUT模式,因为在绝大多数板上,它连着一个板载LED。如果你激活13号引脚上的上拉电阻,它只能拉到1.7V而...
格瑞图:Arduino-0011-内置示例-数字输入上拉 DigitalInputPullup 格瑞图:Arduino-0012-内置示例-状态变更检查 StateChangeDetection 格瑞图:Arduino-0013-内置示例-音调电子琴 Keyboard 格瑞图:Arduino-0014-内置示例-音调旋律 Melody 格瑞图:Arduino-0015-内置示例-音调多播放器 ToneMultiple ...
pinMode(button,INPUT_PULLUP); //配置为数字输入,且使能内部上拉电阻 Serial.begin(9600); }voidloop() {if(isKeyPressed(button))//如果检测到按键按下,就让pwmVal 增加2{ pwmVal+=2;//pwmVal 的类型为byte,到了256会自动溢出回0,所以为没做检查,不过不要过度依赖这个技巧啊,规范些好} ...
detachInterrupt(interrupt); detachInterrupt(Pin);。 3、示例 void setup() { // 初始化日志打印串口 Serial.begin(115200); // 配置中断引脚 pinMode(26, INPUT|PULLUP ); // 检测到引脚 26 下降沿,触发中断函数 blink attachInterrupt(26, blink, FALLING); ...
(13, INPUT_PULLUP); pinMode(14, INPUT_PULLUP); #endif // camera init esp_err_t err = esp_camera_init(&config); if (err != ESP_OK) { Serial.printf("Camera init failed with error 0x%x", err); return; } sensor_t * s = esp_camera_sensor_get(); // initial sensors are ...
pinMode(j, INPUT_PULLUP); } } if (found == 2) { Serial.println("Diagnosing as:-"); for (i = 0; i < 2; i++) { showpins(Apins[i], Dpins[i], Values[i], (Values[i] < Values[!i]) ? "XM,XP: " : "YP,YM: "); ...
constbyte ledPin=3;//pwm输出引脚constbyte button=6;//按键引脚byte pwmVal=0;boolisKeyPressed(byte pin);voidsetup(){pinMode(button,INPUT_PULLUP);//配置为数字输入,且使能内部上拉电阻Serial.begin(9600);}voidloop(){if(isKeyPressed(button))//如果检测到按键按下,就让pwmVal 增加2{pwmVal+=2;...