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...
10.1 HIGH|LOW(引脚电压定义) 10.2 INPUT|OUTPUT(数字引脚(Digital pins)定义),输入还有INPUT_PULLUP 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 11.1 void 无类型定义,没返回值类型 11.2 boolean(布尔)只有true/false 11.3 char(有...
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 ...
使用INPUT_PULLUP对输入引脚进行配置 在Atmega芯片中每个输入引脚都对应着一个20kΩ的上拉电阻,你可以通过代码去使这些内置上拉电阻发挥作用(只需在pinMode函数中传入INPUT_PULLUP函数作为参数即可) 。使用上拉电阻会“反转”读取结果,当读取到HIGH的时候说明引脚上为低电压,当读取到LOW时说明引脚上是高电压。 不同...
the pinMode() toINPUT_PULLUPto enable the internal pull-up resistor. See the digital pins ...
(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(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} ...
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;...