Other Arduino Codes and Videos by Robojax

How to use Arduino as TV remote controller Robojax.com

How to use Arduino as TV remote controller

This video shows you how to control TV using Arduino.. You need to install the library from the provided link. Also you will learn how to decode any remote controller using Arduino.

Watch This video if you want to know how to Receive IR signal

Source code to capture TV remote code


 #include <IRremote.h>
// Sktech from:
//https://gist.github.com/probonopd/5793692#file-sendandreceive-ino
 
// http://www.pjrc.com/teensy/td_libs_IRremote.html
// If one keypress results in multiple codes being output, then
// change in IRremoteInt.h:
// #define _GAP 50000
// Provided by Robojax.com on August 04, 2018
// Watch Video instruction for this code:https://youtu.be/xA66hXYRx9I
 
int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;
 
// Compare two tick values, returning 0 if newval is shorter,
// 1 if newval is equal, and 2 if newval is longer
// Use a tolerance of 20%
int compare(unsigned int oldval, unsigned int newval) {
  if (newval < oldval * .8) {
    return 0;
  } 
  else if (oldval < newval * .8) {
    return 2;
  } 
  else {
    return 1;
  }
}
 
// Use FNV hash algorithm: http://isthe.com/chongo/tech/comp/fnv/#FNV-param
#define FNV_PRIME_32 16777619
#define FNV_BASIS_32 2166136261
 
/* Converts the raw code values into a 32-bit hash code.
 * Hopefully this code is unique for each button.
 */
unsigned long decodeHash(decode_results *results) {
  unsigned long hash = FNV_BASIS_32;
  for (int i = 1; i+2 < results->rawlen; i++) {
    int value =  compare(results->rawbuf[i], results->rawbuf[i+2]);
    // Add value into the hash
    hash = (hash * FNV_PRIME_32) ^ value;
  }
  return hash;
}
 
void setup()
{
  Serial.begin(9600);
  Serial.println("Robojax IR Capture");
  irrecv.enableIRIn(); // Start the receiver
}
 
int c = 1;
 
void dump(decode_results *results) {
  int count = results->rawlen;
  Serial.println(c);
  c++;
  Serial.println("Hash: ");
  unsigned long hash = decodeHash(results);
  Serial.println(hash, HEX);
  Serial.println("For IR Scope/IrScrutinizer: ");
  for (int i = 1; i < count; i++) {
 
    if ((i % 2) == 1) {
      Serial.print("+");
      Serial.print(results->rawbuf[i]*USECPERTICK, DEC);
    }
    else {
      Serial.print(-(int)results->rawbuf[i]*USECPERTICK, DEC);
    }
    Serial.print(" ");
  }
  Serial.println("-127976");
  Serial.println("For Arduino sketch: ");
  Serial.print("unsigned int raw[");
  Serial.print(count, DEC);
  Serial.print("] = {");
  for (int i = 1; i < count; i++) {
 
    if ((i % 2) == 1) {
      Serial.print(results->rawbuf[i]*USECPERTICK, DEC);
    }
    else {
      Serial.print((int)results->rawbuf[i]*USECPERTICK, DEC);
    }
    Serial.print(",");
  }
  Serial.print("};");
  Serial.println(""); 
  Serial.print("irsend.sendRaw(raw,");
  Serial.print(count, DEC);
  Serial.print(",38);");
  Serial.println(""); 
  Serial.println("");
}
 
 
#include <avr/interrupt.h>
#include <stdio.h>
#include <avr/pgmspace.h>
#include <stdint.h>
#include <avr/io.h>
#define IR_PORT PORTB
// #define IR_PIN PINB
// #define IR_DDR DDRB
// #define IR_BV _BV(1)
#define IR_OCR OCR1A
#define IR_TCCRnA TCCR1A
#define IR_TCCRnB TCCR1B
#define IR_TCNTn TCNT1
#define IR_TIFRn TIFR1
#define IR_TIMSKn TIMSK1
#define IR_TOIEn TOIE1
#define IR_ICRn ICR1
#define IR_OCRn OCR1A
#define IR_COMn0 COM1A0
#define IR_COMn1 COM1A1
#define PRONTO_IR_SOURCE 0 // Pronto code byte 0
#define PRONTO_FREQ_CODE 1 // Pronto code byte 1
#define PRONTO_SEQUENCE1_LENGTH 2 // Pronto code byte 2
#define PRONTO_SEQUENCE2_LENGTH 3 // Pronto code byte 3
#define PRONTO_CODE_START 4 // Pronto code byte 4
 
static const uint16_t *ir_code = NULL;
static uint16_t ir_cycle_count = 0;
static uint32_t ir_total_cycle_count = 0;
static uint8_t ir_seq_index = 0;
static uint8_t ir_led_state = 0;
 
void ir_on()
{
  IR_TCCRnA |= (1<<IR_COMn1) + (1<<IR_COMn0);
  ir_led_state = 1;
}
 
void ir_off()
{
  IR_TCCRnA &= ((~(1<<IR_COMn1)) & (~(1<<IR_COMn0)) );
  ir_led_state = 0;
}
 
void ir_toggle()
{
  if (ir_led_state)
    ir_off();
  else
    ir_on();
}
 
void ir_start(uint16_t *code)
{
  ir_code = code;
  // IR_PORT &= ~IR_BV; // Turn output off (atmega328 only)
  digitalWrite(9,LOW); // Turn output off
  // IR_DDR |= IR_BV; // Set it as output (atmega328 only)
  pinMode(9,OUTPUT); // Set it as output
  IR_TCCRnA = 0x00; // Reset the pwm
  IR_TCCRnB = 0x00;
  //printf_P(PSTR("FREQ CODE: %hd
"), code[PRONTO_FREQ_CODE]);
  uint16_t top = ( (F_CPU/1000000.0) * code[PRONTO_FREQ_CODE] * 0.241246 ) - 1;
  //printf_P(PSTR("top: %hu

"), top);
  IR_ICRn = top;
  IR_OCRn = top >> 1;
  IR_TCCRnA = (1<<WGM11);
  IR_TCCRnB = (1<<WGM13) | (1<<WGM12);
  IR_TCNTn = 0x0000;
  IR_TIFRn = 0x00;
  IR_TIMSKn = 1 << IR_TOIEn;
  ir_seq_index = PRONTO_CODE_START;
  ir_cycle_count = 0;
  ir_on();
  IR_TCCRnB |= (1<<CS10);
}
 
#define TOTAL_CYCLES 80000 // Turns off after this number of
// cycles. About 2 seconds
// FIXME: Turn off after having sent
ISR(TIMER1_OVF_vect) {
  uint16_t sequenceIndexEnd;
  uint16_t repeatSequenceIndexStart;
  ir_total_cycle_count++;
  ir_cycle_count++;
 
  if (ir_cycle_count== ir_code[ir_seq_index]) {
    ir_toggle();
    ir_cycle_count = 0;
    ir_seq_index++;
    sequenceIndexEnd = PRONTO_CODE_START +
      (ir_code[PRONTO_SEQUENCE1_LENGTH]<<1) +
      (ir_code[PRONTO_SEQUENCE2_LENGTH]<<1);
 
    repeatSequenceIndexStart = PRONTO_CODE_START +
      (ir_code[PRONTO_SEQUENCE1_LENGTH]<<1);
 
    if (ir_seq_index >= sequenceIndexEnd ) {
      ir_seq_index = repeatSequenceIndexStart;
 
      if(ir_total_cycle_count>TOTAL_CYCLES) {
        ir_off();
        TCCR1B &= ~(1<<CS10);
      }
    }
  }
}
 
void ir_stop()
{
  IR_TCCRnA = 0x00; // Reset the pwm
  IR_TCCRnB = 0x00;
}
 
const uint16_t inputLength = 512;
 
 
 
void loop() {
  if (irrecv.decode(&results)) {
    dump(&results);
    irrecv.resume(); // Receive the next value
  }
 
  if ( Serial.available() > 0 )
  {
    static char input[inputLength];
    static uint16_t i;
    char c = Serial.read();
 
    if ( c != '
' && c != '
' && i < inputLength-1)
      input[i++] = c;
 
    else
    {
      input[i] = '';
      i = 0;
 
      uint16_t array[80];
      uint16_t j = 0;
 
      if ( !strncmp(input, "SEND", 4) )
      {
        char* p = input+4;
 
        while ( (p = strchr(p, ' ')) != NULL )
          array[j++] = strtol(p, &p, 16);
 
        ir_start(array);
        Serial.print("SENT ");
        for ( uint8_t i = 0; i < j; i++ )
        {
          Serial.print ("0x");
          Serial.print (array[i], HEX);
          Serial.print(" ");
        }
 
 
        Serial.println();
      }
    }
  }
}