Using the repeat code FFFFFFFF to adjust volume

Hi- first post!

I programmed a step motor to turn the knob of an old receiver. the ir sensor works with my remote, but when I hold the button down I get the repeat code ffffffff and I would like to change my programming so when I hold a button down it continues to do what the last signal does.

Any guidance is very much appreciated.

Heres my code:

#include <Wire.h>
#include <Adafruit_MotorShield.h>
#include <IRremote.h>

// Create the motor shield object with the default I2C address
Adafruit_MotorShield AFMS = Adafruit_MotorShield();

// Connect stepper motor with 32 steps per revolution
// to motor port #1 (M1 and M2)
Adafruit_StepperMotor *myMotor = AFMS.getStepper(32, 1);

/*----- Variables, Pins -----*/
int receiver = 2; // Signal Pin of IR receiver to Arduino Digital Pin 2

/*-----( Declare objects )-----*/
// Setup of proper sequencing for Motor Driver Pins
// In1, In2, In3, In4 in the sequence 1-3-2-4

IRrecv irrecv(receiver);    // create instance of 'irrecv'
decode_results results;     // create instance of 'decode_results'

void setup()
{
 irrecv.enableIRIn(); // Start the receiver
 Serial.begin(9600);  // set up Serial library at 9600 bps
 AFMS.begin();  // create with the default frequency 1.6KHz
 myMotor->setSpeed(200);  // 200 rpm   
}


//main loop to listen for remote IR signal and move motor

void loop()
{
 if (irrecv.decode(&results)) // have we received an IR signal?

 {
   switch (results.value)

   {

     case 0x219EA05F: // UP button pressed
       myMotor->step(35, BACKWARD, SINGLE); //I need backward motion to turn my volume knob up
       //delay(200);  this was in the original code but I decided no delay was better
       myMotor->release(); //saves stepper from using voltage and getting hot at rest
       break;

     case 0x219E00FF: // DOWN button pressed
       myMotor->step(35, FORWARD, SINGLE);
       //delay(200);
       myMotor->release();
       break;

   }

   irrecv.resume(); // receive the next value
 }


}/* --end main loop -- */

You really should have read the How to use this forum - please read post at the top of the index page and How to use this forum before posting.

ie Your code and any error messages should always be placed between code tags. Posting it inline as you have done makes it much harder to read or copy and paste for diagnosis.

It’s still not too late to edit your post and do this. You’ll make potential helpers much happier. :slight_smile:

Why not store the last code received, then if you get 0xFFFFFFFF, just repeat the last operation?

Edited to forum standards, thank you!

I would like to store the last code received and have 0xFFFFFFFF repeat the last operation, but I don't not understand how to implement that into my sketch.

You need to declare an unsigned long variable and set it equal to the code you receive when you receive one. What’s not to understand.

unsigned long lastCode;

// then in void loop when you receive a code that is not 0xFFFFFFFF

void loop()
{
 if (irrecv.decode(&results)) // have we received an IR signal?

    if(results.value != 0xFFFFFFFF){
       lastCode = results.value;
    }

I uploaded the code after adding what was suggested, and now the motor does not respond at all to the remote. :frowning:

#include <Wire.h>
#include <Adafruit_MotorShield.h>
#include <IRremote.h>



// Create the motor shield object with the default I2C address
Adafruit_MotorShield AFMS = Adafruit_MotorShield();

// Connect stepper motor with 32 steps per revolution
// to motor port #1 (M1 and M2)
Adafruit_StepperMotor *myMotor = AFMS.getStepper(200, 2);

/*----- Variables, Pins -----*/
int receiver = 2; // Signal Pin of IR receiver to Arduino Digital Pin 2

/*-----( Declare objects )-----*/
// Setup of proper sequencing for Motor Driver Pins
// In1, In2, In3, In4 in the sequence 1-3-2-4

IRrecv irrecv(receiver);    // create instance of 'irrecv'
decode_results results;     // create instance of 'decode_results'

void setup()
{
 irrecv.enableIRIn(); // Start the receiver
 Serial.begin(9600);  // set up Serial library at 9600 bps
 AFMS.begin();  // create with the default frequency 1.6KHz
 myMotor->setSpeed(10);  // 200 rpm   
}


unsigned long lastCode;

// then in void loop when you receive a code that is not 0xFFFFFFFF
//main loop to listen for remote IR signal and move motor

void loop()
{
 if (irrecv.decode(&results)) // have we received an IR signal?

   if(results.value != 0xFFFFFFFF){
       lastCode = results.value;
    }
 {
   switch (results.value)
   {
     case 0x219EA05F: // UP button pressed
       myMotor->step(35, BACKWARD, SINGLE); //I need backward motion to turn my volume knob up
       //delay(200);  this was in the original code but I decided no delay was better
       myMotor->release(); //saves stepper from using voltage and getting hot at rest
       break;

     case 0x219E00FF: // DOWN button pressed
       myMotor->step(35, FORWARD, SINGLE);
       //delay(200);
       myMotor->release();
       break;
  
    
   }

   irrecv.resume(); // receive the next value

 }


    }/* --end main loop -- */

You are doing nothing with lastCode

   switch (results.value)

Shouldn't this be

  switch (lastCode)

I have been wrestling with a similar problem and wanted to post my results to help other wandering souls who are trawling Google.

I had to do 3 things to make this work:

  1. Add an unsigned variable called lastCode
  2. Update the variable lastCode each time I received a good code (non FFFF code)
  3. Replace FFFF codes with lastCode variable each time FFFF was received

My sketch moves a servo using an infrared remote. Clicking a button moves it a step, holding it down makes it continue to move.

#include <IRremote.h>
#include <Servo.h>

int RECV_PIN = 2;       //IR Receiver connected to pin 2
int pos = 90;           // Start at 90º
unsigned long lastCode; // stores last code received

IRrecv irrecv(RECV_PIN);
decode_results results;

Servo myservo;          // create servo object to control a servo

void setup()
{
  Serial.begin(9600);
  irrecv.enableIRIn();  // Start the receiver
  myservo.attach(9);    // attaches the servo on pin 9 to the servo object

}

void loop() {
if(irrecv.decode(&results)) //this checks to see if a code has been received
{

    if(results.value == 0xFFFFFFFF)   // if repeat command (button held down)
    {
       results.value = lastCode;      // replace FFFF with last good code
    }


    

    if(results.value == 0xFFA857)     //when button '-' is pressed
    {
        lastCode = results.value;     // record this as last good command
        pos -= 5;                     // subtracts 5º to variable pos
        myservo.write(pos);           // moves servo to new pos position
        delay(5);  
    }
      
    if(results.value == 0xFF906F)     //when button '+' is pressed
    {
       lastCode = results.value;      // record this as last good command
       pos += 5;                      // adds 5º to variable pos
       myservo.write(pos);            // moves servo to new pos position
       delay(5);   
    }

   


    if(results.value == 0xFF02FD)     //when button '|<<' is pressed
    {
        lastCode = results.value;     // record this as last good command
        pos -= 15;                    // subtracts 15º to variable pos
        myservo.write(pos);           // moves servo to new pos position
        delay(5);  
    }
    
    if(results.value == 0xFFC23D)     //when button '>>|' is pressed
    {
       lastCode = results.value;      // record this as last good command
       pos += 15;                     // adds 15º to variable pos
       myservo.write(pos);            // moves servo to new pos position
       delay(5);   
    }

       
    irrecv.resume(); //receive the next value
}
    
}

Hi flukeym, although worked, your code doesn’t address the problem of pressing other buttons by mistake.
The servo will also move because of sending ffffffff as well.
Also, some remotes do not send repeat code. These remotes send one code at a time. How do you move the servo continuously when a button is pressed and stop when another button is pressed.

@Cookiehu
This thread is 1 1/2 years old.