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...
2、数字输入上拉 DigitalInputPullup - 输出上拉串口 InputPullupSerial This example demonstrates the use of INPUT_PULLUP with pinMode(). It monitors the state of a switch by establishingserial communicationbetween your Arduino and your computer over USB. 本例演示如何使用 pinMode 和 INPUT_PULLUP。
mode:GPIO的I/O模式,取值有3种 INPUT :作为数字输入 OUTPUT :作为数字输出 INPUT_PULLUP:作为数字输入,且使能引脚的内部上拉电阻 Arduino的引脚,在上电时默认就是输入模式,但最好使用pinMode设置,更加明确。 当配置引脚为数字输入模式时,引脚表现为高阻抗状态,引脚内部的电流非常小,就如同在引脚前接了一个100M...
INPUT: in this case you’re going to read data from the sensor. The value you’ll get will be HIGH or LOW (binary). And… There’s also a 3rd option: INPUT_PULLUP. This option is the same as INPUT (you read data from the sensor), but in addition to that, an internal pull up...
Arduino Pinmode Input Pull-Up Simulink Device Driver (https://www.mathworks.com/matlabcentral/fileexchange/66820-arduino-pinmode-input-pull-up-simulink-device-driver), MATLAB Central File Exchange. 검색 날짜: 2025/4/27. 필수 제품: Simulink Arduino hardware support packag...
void pinMode(pin_size_t pin, PinMode mode):设置引脚的输入状态,常用的mode有INPUT、INPUT_PULLUP、INPUT_PULLDOWN等;在上图的按钮应用中应该设置为 INPUT_PULLUP; PinStatus digitalRead(pin_size_t pin):读指定的pin的状态; 将前面的输出和读引脚状态整合在一起,即将读到的BTN的状态直接输出到一个LED上...
{delay(1000);lcd.begin(16,2);Serial.begin(9600);pinMode(enroll, INPUT_PULLUP);pinMode(up, INPUT_PULLUP);pinMode(down, INPUT_PULLUP);pinMode(del, INPUT_PULLUP);pinMode(match, INPUT_PULLUP);pinMode(buzzer, OUTPUT);pinMode(indFinger, OUTPUT);digitalWrite(buzzer, LOW);if(digitalRead(en...
pinMode(26, INPUT|PULLUP ); // 检测到引脚 26 下降沿,触发中断函数 blink attachInterrupt(26, blink, FALLING); Serial.println("\nstart irq test"); } void loop() { } // 中断函数 void blink() { Serial.println("IRQ"); } 二、IIC 使用简析 ...
2、不是所有的引脚都能在程序中使用,比如芯片的Vcc和GND,除了供电,就没做其他的用处。...INPUT_PULLUP:作为数字输入,且使能引脚的内部上拉电阻 Arduino的引脚,在上电时默认就是输入模式,但最好使用pinMode设置,更加明确。...当使用INPUT模式时,引脚作为数字输入,但是不连接任何的拉电阻,处于悬空转态,容易受...
Step 2:Initialize digital pin 2 as an input with the internal pull-up resistor enabled: pinMode(2,INPUT_PULLUP); Step 3:Enter the following line, making pin 13, with the onboard LED an output pinMode(13, OUTPUT); Step 4:Establish a variable to hold the information coming in from you...