Trying to get IR library to work

Other Hardware Sensors
1

BITD I wrote quite a few sketches using old tv remotes, checking the outputs from them and writing programs to receive signals from them and trigger outputs.

I have tried to get back to it with the up to date version of the irremote library but kept getting the offer to load the IR library 2.6.0 which I finally have done. I can now receive signals using irrecvDemo.ino from the examples.

/*
 * IRremote: IRrecvDemo - demonstrates receiving IR codes with IRrecv
 * An IR detector/demodulator must be connected to the input RECV_PIN.
 * Version 0.1 July, 2009
 * Copyright 2009 Ken Shirriff
 * http://arcfn.com
 */

#include <IRremote.h>

#if defined(ESP32)
int IR_RECEIVE_PIN = 15;
#else
int IR_RECEIVE_PIN = 5;
#endif
IRrecv irrecv(IR_RECEIVE_PIN);

decode_results results;

// On the Zero and others we switch explicitly to SerialUSB
#if defined(ARDUINO_ARCH_SAMD)
#define Serial SerialUSB
#endif

void setup() {
    pinMode(LED_BUILTIN, OUTPUT);

    Serial.begin(115200);
#if defined(__AVR_ATmega32U4__)
    while (!Serial)
        ; //delay for Leonardo, but this loops forever for Maple Serial
#endif
#if defined(SERIAL_USB) || defined(SERIAL_PORT_USBVIRTUAL)
    delay(2000); // To be able to connect Serial monitor after reset and before first printout
#endif
    // Just to know which program is running on my Arduino
    Serial.println(F("START " __FILE__ " from " __DATE__));

    // In case the interrupt driver crashes on setup, give a clue
    // to the user what's going on.
    Serial.println("Enabling IRin");
    irrecv.enableIRIn(); // Start the receiver

    Serial.print(F("Ready to receive IR signals at pin "));
    Serial.println(IR_RECEIVE_PIN);
}

void loop() {
    if (irrecv.decode(&results)) 
    {
        Serial.println(results.value, HEX);
        irrecv.resume(); // Receive the next value
    }
    if ((irrecv.decode(&results) == 4FB9867))
    {
        Serial.println("well done")
    }
    delay(100);
}

running it I get a number 4FB9867 when I press a key on my remote so I have added a few lines to try to add a new ‘if’ command that just gives me an indication if it sees the button pressed but I can’t find the correct format for the command.

Am I in the right area and can you tell me what the correct command is or am I unable to read the incoming button press in this way?

2

Try if (results.value == 0x4FB9867) (note the 0x at the start of the hex constant).

Edit: actually, maybe something more like

    if (irrecv.decode(&results)) 
    {
        Serial.println(results.value, HEX);
        if (results.value == 0x4FB9867))
        {
            Serial.println("well done")
        }
        irrecv.resume(); // Receive the next value
    }
    delay(100);
3

thank you for the quick reply.

I have been trying all evening and continued to try after I posted this.

I finally got it to work just now. I added the lines shown

 if (irrecv.decode(&results)) 
    {
        Serial.println(results.value, HEX);
        a = (results.value);
        Serial.println (a);
        irrecv.resume(); // Receive the next value
    }
    if (a == -26521)
    {
        Serial.println("well done");
        a=0;
    }
    delay(100);

I read the results.value into a int and got a different number that I used.

I will look at your suggestion of reading it as 0x4FB9867 and see if that also works.

Again thank you for the swift reply.

4

Putting an unsigned long value into an int variable will have that affect.