有了前文《紅外遙控：智能學(xué)習(xí)紅外遙控編碼》的介紹，接下來如果要通過Rainbow的紅外遙控取控制家電就非常簡單了。
首先我們可以通過紅外接收程序取得遙控器相應(yīng)按鍵的原始編碼，然后讓Rainbow產(chǎn)生38K載波，再按照原始編碼中的時(shí)間序列去控制載波發(fā)送和停止發(fā)送，即可以實(shí)現(xiàn)對家電的控制。
STM32是3.3V低功耗MCU，GPIO管腳的電流一般在8mA左右，如果直接去推動(dòng)紅外發(fā)光二極管發(fā)送紅外指令的話，紅外發(fā)射功率很小，距離稍微遠(yuǎn)點(diǎn)(1m左右)、角度對得不準(zhǔn)的話，家電就無法接收到紅外信號，表現(xiàn)為家電對發(fā)送的紅外指令不理會。為了解決這一問題，Rainbow中專門增加了紅外放大電路，讓紅外發(fā)送功率增加，使得Rainbow像普通紅外遙控器一樣對家電進(jìn)行控制。
本文主要涉及到紅外發(fā)射部分，紅外原始編碼的獲取可以通過前文《紅外遙控：智能學(xué)習(xí)紅外遙控編碼》介紹的程序提取。本文增加了串口接收功能，可以接收來自上位機(jī)串口傳來的數(shù)據(jù)，并根據(jù)上位機(jī)傳來的數(shù)據(jù)控制開關(guān)空調(diào)：上位機(jī)上發(fā)送1，開空調(diào)；發(fā)送0關(guān)空調(diào)。本文的程序在美的空調(diào)上測試通過，在軟件包的“Projects\IR-Send”文件夾包含了本文的完整工程，可以直接編譯、燒寫和調(diào)試。這個(gè)程序主要展示如何在Rainbow中接收來自上位機(jī)指令并遙控空調(diào)，看看main.cpp的代碼：
#include "WProgram.h"
#include "IRRemote.h"
int main()
{
//初始化Rainbow
boardInit();
//初始化默認(rèn)串口
Serial.begin();
Serial.println("IR-Send start...");
//定義紅外發(fā)射對象，紅外發(fā)光二極管接到TIM2的CH1，即：PA0
IRSend irSend;
//美的空調(diào)：開
uint16_t rawData_1[] = {4486,4428,590,1604,590,534,563,1605,591,1603,592,533,563,535,563,1604,591,535,563,534,564,1606,
589,534,563,535,563,1604,590,1603,592,535,563,1604,591,1607,588,535,563,1605,590,1607,588,1604,591,
1632,564,1602,593,1605,591,534,563,1602,593,534,563,534,563,534,563,535,563,534,563,534,563,1604,
591,534,563,1632,563,534,564,1604,590,1605,590,534,563,534,564,534,563,1605,591,533,563,1604,591,
535,563,534,563,1605,590,1604,592,5263,4512,4427,592,1602,593,534,563,1602,593,1632,563,535,563,
534,563,1605,590,535,564,533,563,1607,589,534,563,534,563,1604,592,1602,593,534,563,1604,591,1630,
564,534,563,1631,564,1604,591,1604,592,1603,592,1604,591,1633,563,534,563,1604,592,534,563,535,563,
510,587,534,563,534,564,510,587,1630,565,510,587,1631,564,511,586,1603,592,1604,591,511,587,511,
587,509,588,1605,590,510,587,1603,593,510,587,511,587,1603,592,1604,591};
//美的空調(diào)：關(guān)
uint16_t rawData_0[] =
{4464,4451,567,1628,567,532,565,1628,567,1629,567,531,565,532,567,1626,568,531,566,532,565,1628,
568,532,565,532,566,1627,568,1630,565,532,566,1627,568,532,566,1629,566,1628,567,1629,567,1628,567,
532,565,1629,567,1627,568,1628,567,531,567,531,565,532,566,532,565,1627,568,531,566,532,566,1628,
567,1629,566,1627,568,533,565,532,565,532,566,531,566,532,566,531,565,533,565,532,565,1627,568,
1629,567,1629,567,1628,567,1627,568,5286,4489,4452,567,1629,566,532,566,1628,568,1627,568,531,566,
531,566,1628,568,530,566,531,565,1629,567,532,565,532,565,1630,566,1629,567,532,565,1628,567,533,
565,1629,567,1628,567,1628,592,1604,590,508,577,1616,577,1620,590,1603,567,533,589,508,589,509,589,
508,589,1603,592,508,590,507,590,1603,591,1633,562,1543,652,509,589,509,588,509,589,508,590,508,
589,508,590,507,589,508,589,1605,590,1604,591,1604,591,1604,592,1604,592};
uint16_t len1 = sizeof(rawData_1)/sizeof(uint16_t);
uint16_t len0 = sizeof(rawData_0)/sizeof(uint16_t);
//用38K的載波進(jìn)行調(diào)制
irSend.enableIROut(38);
//根據(jù)串口輸入情況發(fā)射紅外編碼，輸入1打開空調(diào)，輸入0關(guān)閉空調(diào)
while(1)
{
if(Serial.available())
{
switch(Serial.read())
{
case 0x30:
//關(guān)空調(diào)
irSend.sendRaw(rawData_0, len0);
Serial.println("Close conditioner...");
break;
case 0x31:
//開空調(diào)
irSend.sendRaw(rawData_1, len1);
Serial.println("Open conditioner...");
break;
}
}
}
}
通過Rainbow發(fā)送紅外遙控原始編碼非常簡單，只需要經(jīng)過以下幾個(gè)簡單步驟：
1、定義紅外發(fā)送對象：IRSend irSend;
2、設(shè)置載波的頻率：irSend.enableIROut(38)，這里38表示載波頻率是38K
3、準(zhǔn)備紅外遙控原始編碼，可以通過遙控接收程序直接取得
4、調(diào)用發(fā)送函數(shù)按照原始編碼的定義發(fā)送出去：irSend.sendRaw(rawData_0, len0)
上面的程序編譯無誤后，將程序燒寫到Rainbow中，并將紅外發(fā)光二極管插入到Rainbow中專為紅外發(fā)光二極管設(shè)計(jì)的接口中，將紅外發(fā)光二極管對準(zhǔn)空調(diào)，然后在電腦上運(yùn)行串口調(diào)試工具并和Rainbow連接成功，在串口調(diào)試工具中輸入1發(fā)送到Rainbow，此時(shí)美的空調(diào)將會滴的一聲打開了；再輸入0發(fā)送出去，美的空調(diào)將會滴的一聲，然后關(guān)閉電源。