Keith Walker
Published © GPL3+

A Remote Controlled Stereo Volume Control

Using my cable TV remote, I can control the volume and select either TV or radio input to my hi-fi system with this little box.

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A Remote Controlled Stereo Volume Control

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
Molex connectors
×1

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Custom parts and enclosures

attenuator_cct_side_TUKTESJtTw.wmf

Schematics

attenuator_schematic_yGTLL4H6tJ.wmf

attenuator_compside_DmI7eRI7hC.wmf

How the circuit boards are mounted in the box.

Code

Remote Volume Control

C/C++
Copy and paste it
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
//Set custom characters for bar graph display
byte block[8] = {0b1111,0b1111,0b1111,0b1111,0b1111,0b1111,0b1111,0b1111};
byte blank[8] = {0b1111,0b0000,0b0000,0b0000,0b0000,0b0000,0b0000,0b1111};
byte final[8] = {0b1111,0b0001,0b0001,0b0001,0b0001,0b0001,0b0001,0b1111};

int level=10;
int lastlevel=10;
int mflag=1;
int select;
unsigned int code=32783;
unsigned int last;

#include <IRLibDecodeBase.h>  
#include <IRLib_P09_GICable.h>   //A decoder that handles only GI Cable
#include <IRLibCombo.h>     
#include <IRLibRecv.h> 
IRdecode myDecoder;
IRrecv myReceiver(2);    //create a receiver on pin number 2

void setup() 
{
  pinMode (3, OUTPUT); //12db
  pinMode (4, OUTPUT); //6db 
  pinMode (5, OUTPUT); //3db
  pinMode (6, OUTPUT); //1.5db
  pinMode (13, OUTPUT); //input select
  
  lcd.begin(16, 2); // set up the LCD's number of columns and rows:
  lcd.createChar(1, block);
  lcd.createChar(2, blank);
  lcd.createChar(3, final); 
   lcd.setCursor(0, 0);
  lcd.print("Input 1 selected");

  myReceiver.enableIRIn(); // Start the receiver
 }

void loop() 
{
  lcd.setCursor(0, 0);
  if(myReceiver.getResults())  //Read the IR Receiver
    {myDecoder.decode();
     code=(myDecoder.value);
     
    if (code==65535) //Remote repeat FFFF
      {code=last;}
    if (code==32783) //Input 1
      {lcd.print("Input 1 selected");
      digitalWrite (13, LOW);
       last=code;}
    if (code==16391) //Input 2
      {lcd.print("Input 2 selected");
      digitalWrite (13, HIGH);
       last=code;} 
    if (code==28676) //Down
      {level=level-1;
       last=code; lastlevel=level;}
    if (code==45068) //Up
      {level=level+1;
       last=code; lastlevel=level;}
   if (code==61448) //Mute
      {last=code;
       if (mflag)
        {level=0; mflag=0;}
      else
        {level=lastlevel; mflag=1;}
    }
   }
   //Read push-switches
   int ch1 = analogRead(A3); 
   int ch2 = analogRead(A2);
   int dn = analogRead(A1);
   int up = analogRead(A0);

   lcd.setCursor(0, 0);
   if (ch1 < 128)
    {lcd.print("Input 1 selected");
     digitalWrite (13, LOW);
}
   if (ch2 < 128)
    {lcd.print("Input 2 selected");
     digitalWrite (13, HIGH);
}
   lcd.setCursor(0, 1);
    
   if (up < 128)
     {level=level+1;}
   if (dn < 128)
     {level=level-1;}

   //Draw the Bar Graph     
   if (level >=15)
     {level=15;}
   if (level <1)
     {level=0;} 
  for (int i=0; i<=(level); i++)
     {lcd.write (1);}
  if (level < 14)       
    {for (int i=0; i<=(13-level); i++)
    lcd.write (2);}
  if (level <15)
    {lcd.write (3);}
    
// Set the Masks for the 4 relays 
  select = (15 - level);
  
// Pin 6, 1.5db
 if (select & 1)
   {digitalWrite (6, HIGH);} 
 else
   {digitalWrite (6, LOW);}
// Pin 5, 3db
 if (select & 2)
   {digitalWrite (5, HIGH);} 
 else
   {digitalWrite (5, LOW);}
// Pin 4, 6db
 if (select & 4)
   {digitalWrite (4, HIGH);} 
 else
   {digitalWrite (4, LOW);}
// Pin 3, 12db
 if (select & 8)
   {digitalWrite (3, HIGH);} 
 else
   {digitalWrite (3, LOW);}
 
   delay (100);
  myReceiver.enableIRIn(); 
  
}

Credits

Keith Walker

Keith Walker

0 projects • 3 followers
I am a retired electronics engineer. I worked for Hewlett Packard for 33 years..

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  • Arduino
  • Molex