Purpose:
The universal infrared remote control is an example of a helpful device for daily use. You can remotely control household appliances from the smartphone screen by turning such a remote control into an Internet of Things device. For example, turn on the air conditioner in advance when returning home on a hot summer day.
We must first understand the code of the remote control before transmitting.
This project is to use ESP32 to make a Infrared Universal Decoder for home appliance remote control
Fundamental:
圖一: 波長分類
圖二:紅外線發射訊號定義
圖三: oscilloscope signal waveform
Circuit:
YouTubeDemo:
CodeIntroduce:
#include <BluetoothSerial.h>
#include <IRremote.h>
//--------- Flag structure --------------------------------------
typedef struct _vFlag
{
uint8_t BTFlag = 0;
uint8_t L298NFlag = 0;
uint8_t CANFlag = 0;
uint8_t I2C_Flag = 0;
uint8_t BMP180Flag = 0;
uint8_t DS18B20Flag = 0;
uint8_t initial_Flag = 0;
uint8_t Tone_Flag = -1;
uint8_t IR_RECV_Flag=0;
uint8_t IR_SEND_Flag=0;
uint8_t FunctionFlag = 3;
uint8_t SendFlag = 0;
uint8_t BMPCnt = 0;
} vFlag;
vFlag *flag_Ptr;
vFlag flag;
//----------uart--------------
#define LINE_BUFFER_LENGTH 64
//--------- uart structure --------------------------------------
typedef struct _vUart
{
char c;
int lineIndex = 0;
int line1Index = 0;
int BTlineIndex = 0;
bool lineIsComment;
bool lineSemiColon;
char line[128];
char BTline[20];
String inputString;
String BTinputString;
String S1inputString;
int V[16];
char ctemp[30];
char I2C_Data[80];
int DC_Spped = 50;
float Voltage[16];
int Buffer[128];
int StartCnt = 0;
int ReadCnt = 0;
int sensorValue = 0;
} vUart;
vUart *Uart_Ptr;
vUart Uart;
//---------BT--------------------
BluetoothSerial SerialBT;
//---------IR----------------------------
//Platform IR input IR output Tone Core/Pin schema
//ESP32 15 4 27
//----- IR define --------------
//const int IR_RECEIVE_PIN = 15;
//const uint16_t IR_SEND_PIN = 4;
#define IR_RECEIVE_PIN 15 // D15
#define IR_SEND_PIN 4 // D4
IRrecv irrecv(IR_RECEIVE_PIN);
IRsend irsend(IR_SEND_PIN);
decode_results results;
//-------------------------------------------------
void setup()
{
Serial.begin(9600);
Serial.println(F("init"));
//SerialBT.begin("BT_IR"); //worwi no support
irrecv.enableIRIn(); // Start the receiver
//irsend.begin();
}
//-----------------------------------------
void loop()
{
Serial.print(F("Main at core:"));
Serial.println(xPortGetCoreID());
while(1)
{
while (Serial.available() > 0)
{
Uart.c = Serial.read();
if ((Uart.c == '\n') || (Uart.c == '\r'))
{ // End of line reached
if (Uart.lineIndex > 0)
{ // Line is complete. Then execute!
Uart.line[Uart.lineIndex] = '\0'; // Terminate string
processCommand(Uart.line); // do something with the command
Uart.lineIndex = 0;
Uart.inputString = "";
}
else
{
// Empty or comment line. Skip block.
}
Uart.lineIsComment = false;
Uart.lineSemiColon = false;
Serial.println(F("ok>"));
}
else
{
if ((Uart.lineIsComment) || (Uart.lineSemiColon))
{
if (Uart.c == ')')
Uart.lineIsComment = false; // End of comment. Resume line.
}
else
{
if (Uart.c == '/')
{ // Block delete not supported. Ignore character.
}
else if (Uart.c == '~')
{ // Enable comments flag and ignore all characters until ')' or EOL.
Uart.lineIsComment = true;
}
else if (Uart.c == ';')
{
Uart.lineSemiColon = true;
}
else if (Uart.lineIndex >= LINE_BUFFER_LENGTH - 1)
{
Serial.println("ERROR - lineBuffer overflow");
Uart.lineIsComment = false;
Uart.lineSemiColon = false;
}
else if (Uart.c >= 'a' && Uart.c <= 'z')
{ // Upcase lowercase
Uart.line[Uart.lineIndex] = Uart.c - 'a' + 'A';
Uart.lineIndex = Uart.lineIndex + 1;
Uart.inputString += (char)(Uart.c - 'a' + 'A');
}
else
{
Uart.line[Uart.lineIndex] = Uart.c;
Uart.lineIndex = Uart.lineIndex + 1;
Uart.inputString += Uart.c;
}
}
}
} //while (Serial.available() > 0)
//檢查藍芽內是否有資料
while (SerialBT.available())
{
flag.L298NFlag=1;
String BTdata = SerialBT.readString();
//顯示在序列視窗
Serial.println(BTdata);
BTprocessCommand(BTdata); // do something with the command
}//while (BT.available())
if(flag.IR_RECV_Flag==1)
{
if (irrecv.decode(&results))// 接收紅外線訊號並解碼
{
Serial.println(results.value, HEX);
//serialPrintUint64(results.value, HEX);
dump(&results);
//translateIR();
irrecv.resume();
}
}
if(flag.IR_RECV_Flag==2)
{
if (irrecv.decode())
{
translateIR();
irrecv.resume(); // Receive the next value
}
}
if(flag.IR_SEND_Flag==1)
{
irsend.sendNEC(0x84FBD02F, 32); // 輸出紅外線訊號
}
}
}
//-------------------BT-----------------
void BTprocessCommand(String data)
{
if (data =="F")
{
Serial.println(F("Forward"));
//Forward();
}
}
//----------------------------------------
void processCommand(char *data)
{
int len, xlen, ylen, zlen, alen;
int tempDIO;
String stemp;
len = Uart.inputString.length();
//---------------------------------------
if (strstr(data, "VER") != NULL)
{
Serial.println(F("ESP32_20230801"));
}
//---------------------------------------
if (strstr(data, "IR_RECV") != NULL)
{
flag.IR_RECV_Flag=1;
Serial.println(F("IR_RECV"));
}
if (strstr(data, "IR_WOKWI") != NULL)
{
flag.IR_RECV_Flag=2;
Serial.println(F("IR_WOKWI"));
}
//---------------------------------------
if (strstr(data, "IR_SEND") != NULL)
{
flag.IR_SEND_Flag=1;
Serial.println(F("IR_SEND"));
}
}
//-----------------------------------------
void dump(decode_results *results) {
int count = results->rawlen;
if (results->decode_type == UNKNOWN) {
Serial.print(F("Unknown encoding: "));
}
else if (results->decode_type == NEC) {
Serial.print(F("Decoded NEC: "));
}
else if (results->decode_type == SONY) {
Serial.print(F("Decoded SONY: "));
}
else if (results->decode_type == RC5) {
Serial.print(F("Decoded RC5: "));
}
else if (results->decode_type == RC6) {
Serial.print(F("Decoded RC6: "));
}
else if (results->decode_type == PANASONIC) {
Serial.print(F("Decoded PANASONIC - Address: "));
//Serial.print(results->panasonicAddress,HEX);
Serial.print(F(" Value: "));
}
else if (results->decode_type == JVC) {
Serial.print(F("Decoded JVC: "));
}
Serial.print(results->value, HEX);
Serial.print(F(" ("));
Serial.print(results->bits, DEC);
Serial.println(F(" bits)"));
Serial.print(F("unsigned int YourVariableName ["));
Serial.print(count-1, DEC);
Serial.print(F("]={"));
for (int i = 1; i < count; i++) {//ingore data of i=0
if ((i % 2) == 1) {
Serial.print(results->rawbuf[i]*USECPERTICK, DEC);
}
else {
Serial.print(abs(-(int)results->rawbuf[i]*USECPERTICK), DEC);
}
if(i<count-1){
Serial.print(F(","));
}
}
Serial.println(F("};"));
}
//-----------------------------------------
void translateIR()
{
// Takes command based on IR code received
switch (irrecv.decodedIRData.command)
{
case 162:
Serial.println("POWER");
break;
case 226:
Serial.println("MENU");
break;
case 34:
Serial.println("TEST");
break;
case 2:
Serial.println("PLUS");
break;
case 194:
Serial.println("BACK");
break;
case 224:
Serial.println("PREV.");
break;
case 168:
Serial.println("PLAY");
break;
case 144:
Serial.println("NEXT");
break;
case 104:
Serial.println("num: 0");
break;
case 152:
Serial.println("MINUS");
break;
case 176:
Serial.println("key: C");
break;
case 48:
Serial.println("num: 1");
break;
case 24:
Serial.println("num: 2");
break;
case 122:
Serial.println("num: 3");
break;
case 16:
Serial.println("num: 4");
break;
case 56:
Serial.println("num: 5");
break;
case 90:
Serial.println("num: 6");
break;
case 66:
Serial.println("num: 7");
break;
case 74:
Serial.println("num: 8");
break;
case 82:
Serial.println("num: 9");
break;
default:
break;
}
}
//------------------------------------------------------
end
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