First test

IR_esp_v1

#define daikin_freq  38
#define daikin_data  27
int count = 0;
byte delay_low = 0;
byte ir_byte_no = 0;
byte ir_header  = 0;
byte ir_state = 0;
char IR_data[daikin_data] = {0x11,0xDA,0x27,0xF0,0x00,0x00,0x00,0x20,
//0    1    2   3    4    5     6   7
0x11,0xDA,0x27,0x00,0x00,0x41,0x1E,0x00,
//8    9   10   11   12    13   14   15
0xB0,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0xE3 };
//16  17    18  19   20    21   22  23   24   25   26
/*
byte 13=mode
b7 = 0
b6+b5+b4 = Mode
b3 = 0
b2 = OFF timer set
b1 = ON timer set
b0 = Air Conditioner ON
Modes: b6+b5+b4
011 = Cool
100 = Heat (temp 23)
110 = FAN (temp not shown, but 25)
000 = Fully Automatic (temp 25)
010 = DRY (temp 0xc0 = 96 degrees c)
byte 14=temp*2
byte 16=Fan
FAN control
b7+b6+b5+b4 = Fan speed
b3+b2+b1+b0 = Swing control up/down
Fan: b7+b6+b5+b4
0×30 = 1 bar
0×40 = 2 bar
0×50 = 3 bar
0×60 = 4 bar
0×70 = 5 bar
0xa0 = Auto
0xb0 = Not auto, moon + tree
Swing control up/down:
0000 = Swing up/down off
1111 = Swing up/down on
Swing control left/right:
0000 = Swing left/right off
1111 = Swing left/right on
*/

void setup() {
  pinMode(1, OUTPUT);
  digitalWrite(1, LOW);
  sendDaikin(daikin_data);
}

void loop() {
delay (800);
sendDaikin(daikin_freq);
}


void sendDaikin(int khz) {
  // Enables IR output.  The khz value controls the modulation frequency in kilohertz.
  delay_low = 1;
  ir_byte_no = 0;
  ir_header  = 1;
  timer1_isr_init();
  timer1_attachInterrupt(dataIROut);
  timer1_enable(TIM_DIV1, TIM_EDGE, TIM_LOOP);
  timer1_write(clockCyclesPerMicrosecond()*500 / khz);

}

void dataIROut() {
static byte resume_tmp;  
static byte data_tmp;  
static int j; 
static int i; 
static int temp;
static int temp_go_low;
static int pwm_enable;

if (resume_tmp){
  resume_tmp = 0;
  delay_low = 0;
  timer1_write(clockCyclesPerMicrosecond()*500 / daikin_freq); // 38khz
}

if (ir_header == 1){
  ir_header = 0;
  j = 0;
  i = 0;
  pwm_enable = 1;
  temp = 384;
  temp_go_low = 256;
  data_tmp = IR_data[ir_byte_no];
} else {
  
  if (i >= temp)
  {
    i = 0;
    if (data_tmp & (1 << j)){
      temp = 128;    // High
    } else {
      temp = 64;    // Low
    }
    
    pwm_enable = 1;
    temp_go_low = 32;
    
    if (j >= 8) {
      j = 0;
      ir_byte_no ++;
      
      
      
      if (ir_byte_no == daikin_data){
        timer1_detachInterrupt();
        ir_state = 1;  //IR off
      }
      
      data_tmp = IR_data[ir_byte_no];
    }
    j++;
  }
}
    if (ir_byte_no == 8 && delay_low == 1){
      timer1_write(clockCyclesPerMicrosecond()*30000); // delay 30ms
      resume_tmp = 1;  //resume
      ir_state = 1;  //IR off
    }

    if(i >= temp_go_low) pwm_enable = 0;

    if(pwm_enable ==1){
      ir_state = 1 - ir_state;
      digitalWrite(1, ir_state);
    } else {
      ir_state = 0;
      digitalWrite(1, ir_state);
    }
    i++ ;
}