Arduino UNO输出高电平点亮LED（三）

最新推荐文章于 2025-09-13 09:45:00 发布

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该教程介绍了如何使用Arduino UNO通过输出高电平点亮LED灯。由于LED最大电压限制，需要串联一个约100-200欧姆的电阻。示例代码中原本是为了演示输入引脚的内部上拉电阻功能，但已修改为直接控制LED输出，通过轮流开关LED来展示输出功能。

通过 Arduino UNO输出高电平点亮LED。
注意LED可承载的最大电压约为2V，10ma~15ma，需要串联一个电阻100R-200R左右的都可以。一端接GND或-，一端接输出端子。
/*
Input Pull-up Serial

This example demonstrates the use of pinMode(INPUT_PULLUP). It reads a 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 causes the input to read
HIGH when the switch is open, and LOW when it is closed.

created 14 Mar 2012
by Scott Fitzgerald

This example code is in the public domain.

http://www.arduino.cc/en/Tutorial/InputPullupSerial
*/

void setup() {
//start serial connection
Serial.begin(115200);
//configure pin 2 as an input and enable the internal pull-up resistor
//pinMode(2, INPUT_PULLUP);
pinMode(8, OUTPUT);

}

void loop() {
//read the pushbutton value into a variable
//int sensorVal = digitalRead(2);
//print out the value of the pushbutton
//Serial.println(sensorVal);

// Keep in mind the pull-up means the pushbutton’s logic is inverted. It goes
// HIGH when it’s open, and LOW when it’s pressed. Turn on pin 13 when the
// button’s pressed, and off when it’s not:
//if (sensorVal == HIGH) {
// digitalWrite(13, LOW);
//} else {
digitalWrite(8, HIGH);
delay(500);
digitalWrite(8, LOW);
delay(500);
//}
}