pinMode函数 引脚模式选择,模式有INPUT(输入), OUTPUT(输出), INPUT_PULLUP(上拉输入,自动拉高电平) //GPIO FUNCTIONS #defineINPUT0x00 //输入 #defineINPUT_PULLUP0x02 //上拉输入 #defineINPUT_PULLDOWN_160x04// PULLDOWN only possible for pin16下拉输入仅适用于PIN16脚 #defineOUTPUT0x01 //输出 #...
Next, initialize digital pin 2 as an input with the internal pull-up resistor enabled: 接着初始化数字针 2 作为输入,并启用内部上拉电阻: pinMode(2,INPUT_PULLUP); The following line make pin 13, with the onboard LED, an output : 接下来的代码行使针脚 13 作为输出,其连接了板载 LED: pinM...
int buttonUpState = digitalRead(pullUp); int buttonDownState = digitalRead(pullDown); // make a message that will be sent to the serial line String message = “Pull Up: ” + String(buttonUpState); message = message + “。 Pull Down: ” + String(buttonDownState); // send the message...
digital input on pin 2 and prints the results to the serial monitor. The circuit: * Momentary switch attached from pin 2 to ground * Built-in LED on pin 13 Unlike pinMode(INPUT), there is no pull-down resistor necessary. An internal 20K-ohm resistor is pulled to 5V. This configuration...
pinMode(2,INPUT_PULLUP); 复制代码 下面的代码是将连接板载LED的13脚设置为输出模式: pinMode(13, OUTPUT); 复制代码 现在setup函数已经设置完成了,看一下程序的主循环部分。当按键未按下时,内部的上拉电阻连接到5V。Arduino读取时为1或者高电平。当按键按下时,Arduino引脚被拉到地,读取时为0或低电平。
connect to the two long vertical rows on the side of the breadboard to provide access to the 5 volt supply and ground. The third wire goes from digital pin 2 to one leg of the pushbutton. That same leg of the button connects through a pull-down resistor (here 10k ohm) to ground. ...
DigitalReadSerial主要使用设置引脚的状态为输出或者输入,将引脚置高或低,延时函数的应用,串口begin和串口打印,println和print的区别在于,前者有换行,局部变量和全局变量的定义,以及变量的类型,analogwrite表示pwm输出0-255,pinmode有三个选项分别为,input,output,input_pull,第三个为开启内部上拉电阻。之后不需要再接下拉...
// Set all output pins LOW PORTB = 0b00000000 ; // MotorSpin-down grace period delay( 300 ) ; } void bridgeForward( void ) { bridgeOFF() ; // Forward, D8+D9+D13 HIGH, D13 is the onboardLED. PORTB = 0b00100011 ;
your sketch code; please wrap it into a code block, seeGithub markdown manual when encountering an issue that happens at run time, attach the serial output. Wrap it into a code block, just like the code. for issues that happen at compile time, enable verbose compiler output in the IDE ...
Conclusion – Arduino INPUT_PULLUP recap In this tutorial you’ve seen how to properly use pull up and pull down resistors for your Arduino sensors, and when to use the INPUT_PULLUP option for the pinMode function. To recap, you have 3 choices, depending on the default state you want ...