Help understanding SimpleReceiver example IR library

kevcanni · June 6, 2022, 9:07pm

Hoping someone can help me understand my IR receiver code.

I'm using the example library called IRRemote->SimpleReceiver, and modified it slightly so that I can understand it better.

code here:

/*
 * SimpleReceiver.cpp
 *
 * Demonstrates receiving NEC IR codes with IRrecv
 *
 *  This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
 *
 ************************************************************************************
 * MIT License
 *
 * Copyright (c) 2020-2022 Armin Joachimsmeyer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 ************************************************************************************
 */
unsigned char DECODEDDATA;
/*
 * Specify which protocol(s) should be used for decoding.
 * If no protocol is defined, all protocols are active.
 */
//#define DECODE_DENON        // Includes Sharp
//#define DECODE_JVC
//#define DECODE_KASEIKYO
//#define DECODE_PANASONIC    // the same as DECODE_KASEIKYO
//#define DECODE_LG
#define DECODE_NEC          // Includes Apple and Onkyo
//#define DECODE_SAMSUNG
#define DECODE_SONY
//#define DECODE_RC5
//#define DECODE_RC6

//#define DECODE_BOSEWAVE
//#define DECODE_LEGO_PF
//#define DECODE_MAGIQUEST
//#define DECODE_WHYNTER

//#define DECODE_DISTANCE     // universal decoder for pulse width or pulse distance protocols
//#define DECODE_HASH         // special decoder for all protocols

//#define DEBUG // Activate this for lots of lovely debug output from the decoders.
//#define INFO                // To see valuable informations from universal decoder for pulse width or pulse distance protocols

#include <Arduino.h>

/*
 * Define macros for input and output pin etc.
 */
#include "PinDefinitionsAndMore.h"

#include <IRremote.hpp>

void setup() {
    Serial.begin(115200);
    // Just to know which program is running on my Arduino
    Serial.println(F("START " __FILE__ " from " __DATE__ "\r\nUsing library version " VERSION_IRREMOTE));

    // Start the receiver and if not 3. parameter specified, take LED_BUILTIN pin from the internal boards definition as default feedback LED
    IrReceiver.begin(A0, ENABLE_LED_FEEDBACK);

    Serial.print(F("Ready to receive IR signals of protocols: "));
    printActiveIRProtocols(&Serial);
    Serial.print(F("at pin "));
    Serial.println(A0);
}

void loop() {
    /*
     * Check if received data is available and if yes, try to decode it.
     * Decoded result is in the IrReceiver.decodedIRData structure.
     *
     * E.g. command is in IrReceiver.decodedIRData.command
     * address is in command is in IrReceiver.decodedIRData.address
     * and up to 32 bit raw data in IrReceiver.decodedIRData.decodedRawData
     */
    if (IrReceiver.decode()) {

        // Print a short summary of received data
        IrReceiver.printIRResultShort(&Serial);

        Serial.println(IrReceiver.decodedIRData.decodedRawData,HEX);
        DECODEDDATA=IrReceiver.decodedIRData.decodedRawData,HEX;
        Serial.println("vvv");
        Serial.println(DECODEDDATA);
        Serial.println("^^^");
        if (IrReceiver.decodedIRData.protocol == UNKNOWN) {
            // We have an unknown protocol here, print more info
            //IrReceiver.printIRResultRawFormatted(&Serial, true);

        }
        Serial.println();

        /*
         * !!!Important!!! Enable receiving of the next value,
         * since receiving has stopped after the end of the current received data packet.
         */
        IrReceiver.resume(); // Enable receiving of the next value

        /*
         * Finally, check the received data and perform actions according to the received command
         */
        if (IrReceiver.decodedIRData.command == 0x10) {
            // do something
        } else if (IrReceiver.decodedIRData.command == 0x11) {
            // do something else
        }
    }
}

I've added my own line in to try and see how to get the bit of code that I want.

unsigned char DECODEDDATA;
......
......
        IrReceiver.printIRResultShort(&Serial);

        Serial.println(IrReceiver.decodedIRData.decodedRawData,HEX);
        DECODEDDATA=IrReceiver.decodedIRData.decodedRawData,HEX;
        Serial.println("vvv");
        Serial.println(DECODEDDATA);
        Serial.println("^^^");

When I use my remote, I receive results in the Serial Monitor as follows:

Protocol=SONY Address=0x1C5A Command=0x39 Repeat gap=12100us Raw-Data=0xE2D39 20 bits LSB first
E2D39
vvv
57
^^^

I really want to return this value in my DECODEDDATA variable:
0xE2D39
Even this value would be OK:
E2D39
But what i get is this:
57

What do I need to do to get either 0xE2D39 or E2D39 into the variable DECODEDDATA?

anon73444976 · June 6, 2022, 9:09pm

Lose the ",HEX" for starters.

UKHeliBob · June 6, 2022, 9:11pm

unsigned char DECODEDDATA;

An unsigned char can only hold a single character. How many are you receiving ?

kevcanni · June 6, 2022, 9:12pm

OK - code is this

        IrReceiver.printIRResultShort(&Serial);

        Serial.println("Printing command");
        Serial.println(IrReceiver.decodedIRData.decodedRawData,HEX);
        DECODEDDATA=IrReceiver.decodedIRData.decodedRawData;
        Serial.println("vvv");
        Serial.println(DECODEDDATA);
        Serial.println("^^^");

Monitor is this. No better I think.

Protocol=SONY Address=0x1C5A Command=0x3C Repeat gap=12100us Raw-Data=0xE2D3C 20 bits LSB first
Printing command
E2D3C
vvv
57
^^^

kevcanni · June 6, 2022, 9:13pm

I'm not sure. It returns a Hexadecimal number, so I'm not really sure which type to use

anon73444976 · June 6, 2022, 9:16pm

It must be at least unsigned long.

UKHeliBob · June 6, 2022, 9:17pm

Does it, or are you seeing it as Hex because that is the format that you tell it to print

Serial.println(IrReceiver.decodedIRData.decodedRawData,HEX);

kevcanni · June 6, 2022, 9:23pm

Using Address gives me this:

Seems to return a number. Looks like Hex converts it, but either way, I'm not seeing the number I'd expect.

Protocol=SONY Address=0x1C5A Command=0x39 Repeat gap=12350us Raw-Data=0xE2D39 20 bits LSB first
Printing command
E2D39
vvv
7258
^^^

Helps a bit, but it's not the result I'm expecting still

anon73444976 · June 6, 2022, 9:33pm

We can't see your code

kevcanni · June 6, 2022, 9:37pm

/*
 * SimpleReceiver.cpp
 *
 * Demonstrates receiving NEC IR codes with IRrecv
 *
 *  This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
 *
 ************************************************************************************
 * MIT License
 *
 * Copyright (c) 2020-2022 Armin Joachimsmeyer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 ************************************************************************************
 */
unsigned long DECODEDDATA;
/*
 * Specify which protocol(s) should be used for decoding.
 * If no protocol is defined, all protocols are active.
 */
//#define DECODE_DENON        // Includes Sharp
//#define DECODE_JVC
//#define DECODE_KASEIKYO
//#define DECODE_PANASONIC    // the same as DECODE_KASEIKYO
//#define DECODE_LG
#define DECODE_NEC          // Includes Apple and Onkyo
//#define DECODE_SAMSUNG
#define DECODE_SONY
//#define DECODE_RC5
//#define DECODE_RC6

//#define DECODE_BOSEWAVE
//#define DECODE_LEGO_PF
//#define DECODE_MAGIQUEST
//#define DECODE_WHYNTER

//#define DECODE_DISTANCE     // universal decoder for pulse width or pulse distance protocols
//#define DECODE_HASH         // special decoder for all protocols

//#define DEBUG // Activate this for lots of lovely debug output from the decoders.
//#define INFO                // To see valuable informations from universal decoder for pulse width or pulse distance protocols

#include <Arduino.h>

/*
 * Define macros for input and output pin etc.
 */
#include "PinDefinitionsAndMore.h"

#include <IRremote.hpp>

void setup() {
    Serial.begin(115200);
    // Just to know which program is running on my Arduino
    Serial.println(F("START " __FILE__ " from " __DATE__ "\r\nUsing library version " VERSION_IRREMOTE));

    // Start the receiver and if not 3. parameter specified, take LED_BUILTIN pin from the internal boards definition as default feedback LED
    IrReceiver.begin(A0, ENABLE_LED_FEEDBACK);

    Serial.print(F("Ready to receive IR signals of protocols: "));
    printActiveIRProtocols(&Serial);
    Serial.print(F("at pin "));
    Serial.println(A0);
}

void loop() {
    /*
     * Check if received data is available and if yes, try to decode it.
     * Decoded result is in the IrReceiver.decodedIRData structure.
     *
     * E.g. command is in IrReceiver.decodedIRData.command
     * address is in command is in IrReceiver.decodedIRData.address
     * and up to 32 bit raw data in IrReceiver.decodedIRData.decodedRawData
     */
    if (IrReceiver.decode()) {

        // Print a short summary of received data
        IrReceiver.printIRResultShort(&Serial);

        Serial.println("Printing command");
        Serial.println(IrReceiver.decodedIRData.decodedRawData,HEX);
        DECODEDDATA=IrReceiver.decodedIRData.decodedRawData;
        Serial.println("vvv");
        Serial.println(DECODEDDATA);
        Serial.println("^^^");
        if (IrReceiver.decodedIRData.protocol == UNKNOWN) {
            // We have an unknown protocol here, print more info
            //IrReceiver.printIRResultRawFormatted(&Serial, true);

        }
        Serial.println();

        /*
         * !!!Important!!! Enable receiving of the next value,
         * since receiving has stopped after the end of the current received data packet.
         */
        IrReceiver.resume(); // Enable receiving of the next value

        /*
         * Finally, check the received data and perform actions according to the received command
         */
        if (IrReceiver.decodedIRData.command == 0x10) {
            // do something
        } else if (IrReceiver.decodedIRData.command == 0x11) {
            // do something else
        }
    }
}

Currently getting this in the monitor:

Protocol=SONY Address=0x1C5A Command=0x3B Repeat gap=11550us Raw-Data=0xE2D3B 20 bits LSB first
Printing command
E2D3B
vvv
929083
^^^

anon73444976 · June 6, 2022, 9:49pm

So, the right answer.

If you want it in hex, add the ",HEX" to the println.

kevcanni · June 6, 2022, 10:04pm

Ah yes, Thanks so much-that's what I'm missing.

Serial.println(DECODEDDATA,HEX);

system · December 3, 2022, 10:04pm

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Help understanding SimpleReceiver example IR library

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