IRremote的wiki的中文翻译
介绍
IRremote 可以让你用标准的红外遥控器控制 Arduino，也可以用 Arduino 控制其他设备（电视、音箱等）
下载安装请见Arduino-IRremote github page
这份文档包括：
[TOC]
硬件设置
红外接收
IRremote 库可以使用任何一个数字信号引脚来接收 38kHz 红外接收模块的数据。这些模块自带了滤波和逻辑输出。不能直接用红外发射管和红外接收管。
红外发射
将红外发射管和适当大小的电阻连接到有PWM的 pin 3，并确保红外发射管极性正确。我已经用 NTE 3027 和 100 欧实验过（如上图），发射距离大概是4~5米。可以加多一个三极管来加大距离。
红外发射示例
下面这个是 Example -> IRremote -> IRsendDemo，它将控制索尼电视的开和关。需要将一个红外发射管连接到 pin 3.
12345678910111213141516#include
IRsend irsend;
void setup()
{
Serial.begin(9600);
}
void loop() {
if (Serial.read() != -1) {
for (int i = 0; i < 3; i++) {
irsend.sendSony(0xa90, 12); // Sony TV power code
delay(100);
}
}
}
红外接收示例
接收并打印数据
下面这段代码将接收一个数据并通过串口打印出来，可以用于检测你的遥控器使用了什么数据格式。Example中还有一个更复杂的例子 IRrecvDump
同时这段代码也展示了如何在按下遥控器后触发对应的语句。
12345678910111213141516#include
IRrecv irrecv(11); // Receive on pin 11
decode_results results;
void setup()
{
Serial.begin(9600);
irrecv.enableIRIn(); // Start the receiver
}
void loop() {
if (irrecv.decode(&results)) {
Serial.println(results.value, HEX);
irrecv.resume(); // Continue receiving
}
}
长按与松开
下面这段代码展示了在长按遥控器时执行一段代码，松开后执行另一段代码。由于遥控器在按下时会不断地发送一个数据，所以需要用一个计时器来判读是否有松开遥控器。
12345678910111213141516171819202122232425262728293031#include
#define MAX_TIME 150 // max ms between codes
#define LED_PIN 3
long lastPressTime = 0;
int state = LOW;
IRrecv irrecv(11);
decode_results results;
void setup()
{
pinMode(LED_PIN, OUTPUT); // Status on pin 3 LED
irrecv.enableIRIn(); // Start the receiver
}
void loop() {
if (irrecv.decode(&results)) {
if (1) { // Can check for a specific button here
if (state == LOW) {
state = HIGH; // Button pressed, so set state to HIGH
digitalWrite(LED_PIN, HIGH);
}
lastPressTime = millis();
}
irrecv.resume(); // Receive the next value
}
if (state == HIGH && millis() - lastPressTime > MAX_TIME) {
state = LOW; // Haven't heard from the button for a while, so not pressed
digitalWrite(LED_PIN, LOW);
}
}
注意，if (1) 会导致只要按下任何按钮（即使和原来的按钮不同）都能触发代码。如果要设置为特定按钮，需要替换为 if (results.value == 0x1234) （0x1234 是对应按钮的编码）
IRremote API
API 通过 IRsend 对象来发送红外数据，通过 IRrecv 对象来接收红外数据。这个库不能同时发送和接收，但可以在发送和接收之间转换。
发送
1IRsend irsend;
新建一个 IRsend 对象
1irsend.sendNEC(data, bits);
以 NEC格式编码 发送数据，bits 指定了编码长度，一般是16
1irsend.sendSony(data, bits);
以 Sony格式编码 发送数据
1irsend.sendSAMSUNG(data, bits);
以 三星格式编码 发送数据
1irsend.sendRC5(data, bits);
以 RC5格式编码 发送数据
1irsend.sendRC6(data, bits);
以 RC6格式编码 发送数据
1irsend.sendRaw(buf, len, hertz);
Sends a code corresponding to the buffer of raw durations
接收
1IRrecv irrecv(pin);
创建一个IRrecv 对象
1irrecv.enableIRIn();
开始接收红外数据
1int irrecv.decode(&results)
如果接收到数据，返回1，否则返回0.
The fields of results are:
decode_type
NEC, SONY, RC5, RC6, or UNKNOWN
value
the received code value
bits
The number of bits received
rawbuf[]
Raw durations
rawlen
Number of records in rawbuf
1irrecv.resume()
必须在 irrecv.decode() 后调用，以继续接收
IRremote的实例
Many projects have been built with the IRremote library
Arduino Infrared, Blue Robot challenge
Controlling a pedestrian sign with a remote.
Extending the library to arbitrary remotes
Controlling my stereo over the web.
“Universal remote to record and playback IR codes.
Infrared bubble maker project.
Using the library to detect IR beam breaks
electrosthetics used the library to control a home theater receiver.
Arduino: Redefining the TV Remote – using the library and an ultrasonic sensor to control a TV by waving your hand.
Arduino: Infrarot-Receiver Module a 4WD controller (German page)
Smart Lock with Remote Controlled Light (Romanian page)
下面是一些用 IRremote的实例：
Arduino-IRremote-红外遥控器,发射与接收
Arduino红外传感器-IR Transmitter Module红外发射模块
Arduino教程（提高篇）——红外遥控(发射篇)
Arduino红外遥控系列教程 一共有6篇
红外编码
IRremote有如下几种编码：
NEC: 32 bits are transmitted, most-significant bit first. (protocol details)
Sony: 12 or more bits are transmitted, most-significant bit first. Typically 12 or 20 bits are used. Note that the official protocol is least-significant bit first. (protocol details) For more details, I’ve written an article that describes the Sony protocol in much more detail: Understanding Sony IR remote codes.
RC5: 12 or more bits are transmitted most-significant bit first. The message starts with the two start bits, which are not part of the code values. (protocol details)
RC6: 20 (typically) bits are transmitted, most-significant bit first. The message starts with a leader pulse, and a start bit, which is not part of the code values. The fourth bit is transmitted double-wide, since it is the trailer bit. (protocol details)
For Sony and RC5/6, each transmission must be repeated 3 times as specified in the protocol. The transmission code does not implement the RC5/6 toggle bit; that is up to the caller.
排除故障
如果在测试红外接收时，收到的是随机的数据，可以尝试调暗房间的灯光。某些日光灯会对 38kHz红外信号产生干扰。