这是一个基本示例,说明如何在按下按钮时进行接线并使LED亮/灭。
/* Basic Digital Read * ------------------ * * turns on and off a light emitting diode(LED) connected to digital * pin 13, when pressing a pushbutton attached to pin 7. It illustrates the * concept of Active-Low, which consists in connecting buttons using a * 1K to 10K pull-up resistor. * * Created 1 December 2005 * copyleft 2005 DojoDave <http://www.0j0.org> * http://arduino.berlios.de * */ int ledPin = 13; // 选择LED的引脚 int inPin = 7; // 选择输入引脚(用于按钮) int val = 0; // 用于读取引脚状态的变量 void setup() { pinMode(ledPin, OUTPUT); // 声明LED为输出 pinMode(inPin, INPUT); // 声明按钮为输入 } void loop(){ val = digitalRead(inPin); // 读取输入值 if (val == HIGH) { // 检查输入是否为高(释放按钮) digitalWrite(ledPin, LOW); // 关闭LED } else { digitalWrite(ledPin, HIGH); // 打开LED } }
取自Arduino.cc的示例。