“Lesson 3--Microduino "Button Controlled LED"”的版本间的差异

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（Created page with "{| style="width: 800px;" |- | ==目的== 前两个实验介绍了如何用软件直接控制led灯的亮灭。如果我们增加一个按键，通过按键来控制led的亮..."）
 
 
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{{Language|第三课--按钮控制的LED开关}}
 
{| style="width: 800px;"
 
{| style="width: 800px;"
 
|-
 
|-
 
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|
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==目的==
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==Objective==
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前两个实验介绍了如何用软件直接控制led灯的亮灭。如果我们增加一个按键，通过按键来控制led的亮灭，就可以实现硬件与软件的结合。前面实际上是Microduino的I/O口作为输出去控制led，增加按键如何去监测按键输入的信号呢？今天以按键为例讲讲Microduino如何作为输入使用。
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The first two lessons showed you how to use software to control the LED directly. If we add a button
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==设备==
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to control the LED light, then we can combine the use of both hardware and software.
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Previously, we used Microduino I/O port as the output to control the LED. So if we want to use a button,
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how would we monitor when it is pressed?
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In this lesson, we will use a button as an example to show how to use Microduino as an input.
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==Equipment==
 
*'''[[Microduino-Core]]'''
 
*'''[[Microduino-Core]]'''
 
*'''[[Microduino-FT232R]]'''
 
*'''[[Microduino-FT232R]]'''
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*其他硬件设备
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*Other hardware equipment
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**面包板跳线  一盒 
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**1x Box of breadboard jumper wires           
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**面包板  一块 
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**1x Breadboard               
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**LED发光二极管  一个 
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**1x LED (Light-Emitting Diode)
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**220欧姆电阻  一个
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**1x 220ohm resistor          
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**按键          一个 
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**1x Button                       
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**USB数据连接线  一根
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**1x USB Data cable           
  
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==按键==
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==Button==
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*按键原理
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*Button principle
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[[File:第三课-按键原理.jpg|600px|center|thumb]]
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[[File:button.jpg|600px|center|thumb]]
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若用此封装按键制作PCB时，若不好布线，可利用它有两对引脚始终导通作为导线布线。
 
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*按键接法
 
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[[File:第三课-按键接法.jpg|600px|center|thumb]]
 
  
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==原理图==
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*Button connection
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[[File:第三课-原理图.jpg|600px|center|thumb]]
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[[File:button connection.jpg|600px|center|thumb]]
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采用外部下拉，没按下时为低“0”，按下为高。
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==Experiment Schematic==
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[[File:button schematic.jpg|600px|center|thumb]]
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Using the external pulldown method, when the button is unpressed, the input to D2 is "LOW". When pressed, it is "HIGH".
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==Program==
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*LED is on while button is pressed down
  
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==程序==
 
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*led显示按键值
 
 
<source lang="cpp">
 
<source lang="cpp">
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const int buttonPin = 2;    // 定义按键输入引脚
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const int buttonPin = 2;    // Define button input pin
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const int ledPin =  13;    //定义led引脚
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const int ledPin =  11;    //Define LED pin
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int buttonState = 0;        //初始化按键值
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int buttonState = 0;        //Initialize the button value
 
void setup() {
 
void setup() {
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   pinMode(ledPin, OUTPUT);    //设置led引脚为输出状态 
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   pinMode(ledPin, OUTPUT);    //Set the LED pin as output   
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   pinMode(buttonPin, INPUT); //设置按键引脚为输入状态    
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   pinMode(buttonPin, INPUT); //Set button pin as input    
 
}
 
}
 
void loop(){
 
void loop(){
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   buttonState = digitalRead(buttonPin);//从指定的数字引脚读取数值，是高还是低。
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   buttonState = digitalRead(buttonPin);//Read the value from the buttonPin
 
   if (buttonState == HIGH) {     
 
   if (buttonState == HIGH) {     
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     digitalWrite(ledPin, HIGH); //如果按键信号是高，则led点亮（led接法阳极接控制脚，阴极接GND）
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     digitalWrite(ledPin, HIGH); //If the button input signal is high, the LED will light up
 
   }  
 
   }  
 
   else {
 
   else {
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     digitalWrite(ledPin, LOW); //否则熄灭
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     digitalWrite(ledPin, LOW); //LED goes out
 
   }
 
   }
 
}
 
}
 
</source>
 
</source>
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*led电压翻转
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*LED voltage flip
 
<source lang="cpp">
 
<source lang="cpp">
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const int buttonPin = 2;    // 定义按键输入引脚
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const int buttonPin = 2;    // Define button input pin
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const int ledPin =  13;     
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const int ledPin =  11;     
  
 
int buttonState = 0;  
 
int buttonState = 0;  
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boolean led;        //定义led为布尔型（true或false）
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boolean led;        //Define LED as boolean（true or false）
 
void setup() {
 
void setup() {
 
   pinMode(ledPin, OUTPUT);       
 
   pinMode(ledPin, OUTPUT);       
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   // pinMode(buttonPin, INPUT); //设置按键引脚为输入状态   
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   // pinMode(buttonPin, INPUT); //Set the button pin as input   
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   pinMode(buttonPin, INPUT_PULLUP);//设置按键引脚为内部上拉输入状态    
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   pinMode(buttonPin, INPUT);//Set button pin as input    
 
}
 
}
 
void loop(){
 
void loop(){
 
   buttonState = digitalRead(buttonPin);
 
   buttonState = digitalRead(buttonPin);
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   if (buttonState ==HIGH)  
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   if (buttonState ==HIGH)
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//外部下拉，因为这样起始状态为低，只有按下才是高，按下才翻转，否则不按时则会闪烁
 
 
   {   
 
   {   
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     delay(200);                     //短暂延时，防抖
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     delay(200);                   //Short time delay for stabilization
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     // delay(1000);              //长按
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     // delay(1000);              //Long time press
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     // if (buttonState == LOW) //判断是否还是低
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     // if (buttonState == LOW)   //Check still is low
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     led=!led;                   //led状态翻转
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     led=!led;                     //LED state flip
 
   }  
 
   }  
 
   digitalWrite(ledPin, led);   
 
   digitalWrite(ledPin, led);   
 
}
 
}
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此实验需要注意按键的防抖，可以调整延时时间，或者在按键信号变化两端加104电容，电压信号不会突变，稳定点。
 
 
</source>
 
</source>
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按键防抖详细参考：http://www.geek-workshop.com/thread-74-1-1.html
 
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===digitalRead（）用法===
 
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读一个引脚的值，返回值为HIGH或低。
 
  
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==结果==
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===digitalRead() usage===
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*程序1：led显示按键按键引脚值，按键值高则点亮，低则熄灭。
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Read a pin's value and return HIGH or LOW.
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*程序2：每按一次按键，led电压翻转一次，注意防抖。
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==视频==
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==Result==
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*Program 1：LED is on while button is pressed down.
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*Program 2：Each time you press the button, the LED will turn on/off.
 +
==Video==
 
|}
 
|}

2015年7月14日 (二) 19:01的最新版本

Language English

Objective

The first two lessons showed you how to use software to control the LED directly. If we add a button to control the LED light, then we can combine the use of both hardware and software. Previously, we used Microduino I/O port as the output to control the LED. So if we want to use a button, how would we monitor when it is pressed? In this lesson, we will use a button as an example to show how to use Microduino as an input.

Equipment

  • Microduino-Core
  • Microduino-FT232R
  • Other hardware equipment
    • 1x Box of breadboard jumper wires
    • 1x Breadboard
    • 1x LED (Light-Emitting Diode)
    • 1x 220ohm resistor
    • 1x Button
    • 1x USB Data cable

Button

  • Button principle
Button.jpg
  • Button connection
Button connection.jpg

Experiment Schematic

Button schematic.jpg

Using the external pulldown method, when the button is unpressed, the input to D2 is "LOW". When pressed, it is "HIGH".

Program

  • LED is on while button is pressed down
const int buttonPin = 2;     // Define button input pin
const int ledPin =  11;     //Define LED pin
int buttonState = 0;        //Initialize the button value
void setup() {
  pinMode(ledPin, OUTPUT);    //Set the LED pin as output    
  pinMode(buttonPin, INPUT);  //Set button pin as input    
}
void loop(){
  buttonState = digitalRead(buttonPin);//Read the value from the buttonPin
  if (buttonState == HIGH) {     
    digitalWrite(ledPin, HIGH); //If the button input signal is high, the LED will light up
  } 
  else {
    digitalWrite(ledPin, LOW); //LED goes out
  }
}
  • LED voltage flip
const int buttonPin = 2;     // Define button input pin
const int ledPin =  11;     

int buttonState = 0; 
boolean led;         //Define LED as boolean（true or false）
void setup() {
  pinMode(ledPin, OUTPUT);      
  // pinMode(buttonPin, INPUT); //Set the button pin as input     
  pinMode(buttonPin, INPUT);//Set button pin as input    
}
void loop(){
  buttonState = digitalRead(buttonPin);
  if (buttonState ==HIGH)
  {  
    delay(200);                   //Short time delay for stabilization
    // delay(1000);               //Long time press
    // if (buttonState == LOW)    //Check still is low
    led=!led;                     //LED state flip
  } 
  digitalWrite(ledPin, led);  
}

digitalRead() usage

Read a pin's value and return HIGH or LOW.

Result

  • Program 1：LED is on while button is pressed down.
  • Program 2：Each time you press the button, the LED will turn on/off.

Video

取自“http:///https//wiki.microduino.cn/index.php?title=Lesson_3--Microduino_%22Button_Controlled_LED%22&oldid=9036”