Arduino - Switch celling light with TV remote (2/2)

This is the part two of Switch celling light with TV remote tutorial. If needed, please check out the part one from link below. By the way, the source code is also available there.

Quick Link

System Design

See the illustration below. I used a phone charger(purple block; AC110V to DC5V) to supply power from 110v AC power outlet from the celling. The Arduino controls the relay module to switch the celling light and Arduino interpret IR code to change  RGB LED to shift color and on/off accordingly. 


  • IR Receiver to Arduino pin 2
  • IR Receiver + to VCC
  • IR Receiver - to GND
  • Relay + to VCC
  • Relay - to GND
  • Relay to Arduino pin 8
  • RGB Red to Resistor to Arduino pin 3
  • RGB Green to Resistor to Arduino pin 5
  • RGB Blue to Resistor to Arduino pin 6
  • *** CAUTION: Turn off home main power switch first before 110V connection! ***
  • *** Connect 110V to the system after you secure prefboard to the celling light ***
  • Connect 110V VCC to "Relay NO (Normally Open)" on the left
  • Connect Relay COM (Common connection) to 110V GND. 

      Step by step

      Solder pins to Arduino mini pro.

      Pick up the corner of the perfboard as the fix position. Then, solder pin header connectors on the side of Arduino mini pro, so we could have the flexibility to change wiring later.  Don't forget to face Arduino five data pins towards outside of the prefboard for easier connection to upload source code later.

      Selected few unused solder holes from the Arduino Mini Pro and used the connection pin headers as supporting material on the perfboard. This could prevent unintentional shortage. See below:

      After fixed Arduino Mini Pro in place, solder RGB LED, resistors, and wires to the prefboard. 
      Remember to power up to test the whole setup before moving forward.

      I used a screw to fix the relay module on the perfboard. However, fixed on one side is not stable enough, so I took a cable tight to keep the relay module tightly in place.  *Remember to reserve a very long IR reception wire*, so the IR receiver could placed outside of the celling light or the IR receiver might be obscured by the decorative glass cover.

      Here is the over all system in action!

      Next, find a good power source for the system. 
      For this project, I used a HTC smart phone charger. At least, HTC is (or was?) an international brand name smartphone company and has good reputation regarding to safety. Again, for safety reason, please use certified chargers only, such as CE, FCC, UL from well-know brand name company. *** Do not use no brand or very cheap chargers from unknown source. You are on your own risk! ***

      I used a short USB cable to connect the HTC charger to the system.  Cut the USB cable near micro-B (smaller connector) and strip the shielding off the cable. In there, you will find four wires with GREEN, WHITE, RED, BLACK. Solder the RED(5V+) and BLACK(GND) wires to positive and negative respectively on the perfboard. 

      Cable connection:
      • USB type-A (Larger connector) to HTC charger
      • USB micro-B (smaller connector) to system

      After soldered the USB wires, plug the charger to power outlet and test the system.

      My bedroom celling light looks like this below. It has a switch located at the entrance of the bedroom. And the switch works like this. After implement this system, the control of the switch will be shift to Arduino Mini Pro.

      For every switch on/off, it cycles through 

      1.  Turn on three lights
      2.  Turn off
      3.  Turn on Five lights
      4.  Turn off 
      5.  Turn on two lights
      6.  Turn off

      Carefully loosen the screw from the bottom glass cover and remove the decorative glass away.

      Drill a hole on the light base for tightening the system.

      Use a screw to secure the prefboard to the celling light as shown below.

      *** Important: Wrong connection will cause the light not working ***
      • Connect 110v VCC to "Relay NO (Normally Open)" on the left
      • Connect Relay COM (Common connection) to 110v GND

      When connect AC 110V power line to phone charger, please make sure the isolation is done properly. It would be better to use Heat shrink tube for the isolation. However, I didn't have those on hand, so I used the isolation tape and tight them 3~4 times to ensure it's 100% isolated.  

      *** Disclaimer: Many experts expressed safety concerns for connecting Arduino with relay to AC 110V power!  I'm not responsible for any damage or lose that could happened to your projects or properties! You are at your own risk of doing this! ***

      Before tighten the light frame and decorative glass back to the celling, use the remote to test the system to see if it's working as expected.

      See the red circle below, that's the IR receiver that I used an extended wire from the perfboard to the rim of the light to get better IR reception.

      Let's try to change the color with the TV remote.

      Finally, the project is completed! Watch the video below to see it in action!
      Now I can turn the celling light off directly from my bed after turn TV off!  

      This is the end of this tutorial. I hope you liked it! Please leave comments below and I will see you next time.



      Arduino - Switch celling light with TV remote (1/2)


      It must be happened to you before that in a very cold night watching TV or movie in bed and you were ready for bed. You turned off the TV or DVD player with remote control easily. However, for the celling light, you just had to get out of the bed to turn the light off. What a pain! 

      After I searched the Internet, there are many examples out there suit for this purpose, such as IR receiver, relay module, and RGB LED shift hue and most of them have codes that I could utilize on this project.  

      Quick Link

      Material Needed

      • Arduino mini pro *1 
      • USB upload module *1 
      • Relay module (5V/10A/125V) * 1 
      • IR Receiver LED * 1 (Aixin AX-1838HS 38KHz * 1 / All 38KHz should work) 
      • RGB LED *2 
      • Resister 220 Om * 3
      • Few jump wires
      • Any TV or DVD remote you have at home
      • Breadboard * 1
      It's not difficult to find these components on Amazon or eBay.

      System Functionality

      Assign two buttons on the remote to control the celling light. Remember to assign less frequently used buttons on the remote or you might accidentally activate the particular function on your appliances. :)
      • Button 1: Turn on/off
      • Button 2: Switch LED color hues (static or color shifting)


      This schematic is made with Fritzing. 
      You can download it from its official website: www.fritzing.org


      • IR Receiver to Arduino pin 2
      • IR Receiver + to VCC
      • IR Receiver - to GND
      • Relay + to VCC
      • Relay - to GND
      • Relay to Arduino pin 8
      • RGB Red to Resistor to Arduino pin 3
      • RGB Green to Resistor to Arduino pin 5
      • RGB Blue to Resistor to Arduino pin 6

      Check Remote IR code

      You have to find out the remote button IR codes on your remotes and embed them in the source code below for this project to work.

      For Example, my Sanyo TV remote has the following codes. As you can see, I have assigned two buttons for each feature to have a fall back plan.

      • Celling Light Switch function
        • Mute:irCode: 1CE318E7,  bits: 32  sanyoLight1
        • Channel minus :irCode: 1CE3D02F,  bits: 32  sanyoLight2
      • LED Switch function
        • Volume minus :irCode: 1CE3F00F,  bits: 32  sanyoLED1
        • CH View: irCode: 1CE352AD,  bits: 32 sanyoLED2

      To find out the IR codes for you remote, please refer to my previous IR Repeater Tutorial (Part 2)

      Source Code

       * Author: Stonez56
       * IRRemote for bedroom lighting control 
       *   Light buttons: Switch lights through the 
       *            cycle - 3, 5, 2, off with 2 types of remote
       *   LED buttons: Switch display random color a, b, transistion, off
      #include <IRremote.h>
      // Setting up pins
      // Setup pin 8 for relay. 
      //    For some reason, Pin 13 will cause relay to switch one time
      //    when system powers on
      const int relay1Pin = 8; 
      const int redPin = 3;                    
      const int greenPin = 5;
      const int bluePin = 6;
      const int irReceiverPin = 2;
      // Milisecond to delay when shifting colors
      int colorShiftTime[] = {20, 10, 1, 50}; 
      int colorShiftTimeCounter = 0;
      int myPins[] = {2, 4, 8, 3, 6};
      int LEDstatus = 0;       // mode of LED or switch light
                           * 0 = LED off
                           * 1 = LED orange
                           * 2 = LED color rotation
                           * 3 = Relay Light swtich
      int relay1Status = 0; // Switch of the relay; either 1 or 0;
      IRrecv irrecv(irReceiverPin);            
      decode_results results;  // IR decode_results 
      unsigned int rgbColour[3]; //RGB LED array
      unsigned int preCode = 0x0;  //Previous remote code
      unsigned int currentCode = 0x0; //Current remote code
      /* Define remote codes  
      Remote A (iBit Remote)
        - (L/R) irCode: 609E09F6,  bits: 32 bitLigth1
        - Subtitle:irCode: 609E8877,  bits: 32  bitLight2
       LED Switch
        - Sound change irCode: 609E42BD,  bits: 32 bitLED1
        - Favorite channel:irCode: 609E728D,  bits: 32 bitLED2
        LED Color speed 
          - colorShiftTime: irCode: 
      const unsigned long bitLight1 = 0x609E09F6;
      const unsigned long bitLight2 = 0x609E8877;
      const unsigned long bitLED1 = 0x609E42BD;
      const unsigned long bitLED2 = 0x609E728D; 
      const unsigned long bitLEDspeed = 0x609EAA55;
      Remote B (Sanyo Remote)
        - Mute:irCode: 1CE318E7,  bits: 32  sanyoLight1
        - Channel minus :irCode: 1CE3D02F,  bits: 32  sanyoLight2
       LED Switch
        - Volume minus :irCode: 1CE3F00F,  bits: 32  sanyoLED1
        - CH View: irCode: 1CE352AD,  bits: 32 sanyoLED2
        LED Color speed
          - colorShiftTime: irCode: 
      const unsigned long sanyoLight1 = 0x1CE318E7;
      const unsigned long sanyoLight2 = 0x1CE3F00F;
      const unsigned long sanyoLED1 = 0x1CE352AD;
      const unsigned long sanyoLED2 = 0x1CE3D02F;
      const unsigned long sanyoLEDspeed = 0x1CE350AF;
      void setup()
        irrecv.enableIRIn(); // enable IR pin
        pinMode(relay1Pin, OUTPUT);
        // Start off with the LED off.
      // Turn off LED
      void ledOff(){
        rgbColour[0] = 255;
        rgbColour[1] = 255;
        rgbColour[2] = 255;  
        setColourRgb(rgbColour[0], rgbColour[1], rgbColour[2]);
        preCode = currentCode;
        while(preCode == currentCode){
              currentCode = checkRemoteCode();
              // Check the code on Serial port
              Serial.print(rgbColour[0]); Serial.print(" | ");
              Serial.print(rgbColour[1]);  Serial.print(" | ");
      * Turn on LED to Orange color
      void ledOrange(){
        //LED color orange??
        rgbColour[0] = 65391;
        rgbColour[1] = 400;
        rgbColour[2] = 255;  
        setColourRgb(rgbColour[0], rgbColour[1], rgbColour[2]);
        preCode = currentCode;
        while(preCode == currentCode){
              currentCode = checkRemoteCode();
       * Rotating RGB LED color
      void colorRotation(){
        // Start off with red.
        rgbColour[0] = 0;
        rgbColour[1] = 255;
        rgbColour[2] = 255;  
        preCode = currentCode;
        // Choose the colours to increment and decrement.
        for (int decColour = 0; decColour < 3; decColour += 1) {
          int incColour = decColour == 2 ? 0 : decColour + 1;
          // cross-fade the two colours.
          for(int i = 0; i < 255; i += 1) {
            rgbColour[decColour] -= 1;
            rgbColour[incColour] += 1;   
            setColourRgb(rgbColour[0], rgbColour[1], rgbColour[2]);
            currentCode = checkRemoteCode();
            Serial.print(" R:");Serial.print(rgbColour[0]);
            Serial.print(" G:");Serial.print(rgbColour[1]);
            Serial.print(" B: ");Serial.println(rgbColour[2]); 
            //if accepted new remote codes,
            //     exit this function and back to the main loop;
            if(preCode != currentCode){
      } // End of LED color rotation
      /* This turn on/off relay switch
      void switchRelay(){
        relay1Status = 1 - relay1Status;   
         if(relay1Status == 0){
          digitalWrite(relay1Pin, HIGH);
          digitalWrite(relay1Pin, LOW);
      /* Check remote code and return a mode to be changed
      int checkRemoteCode(){
        if (irrecv.decode(&results)) { // Received IR code and decoded ok!
          // Print to Serial port for debug purposes
          Serial.print("Color shift time: ");
          Serial.print("  irCode: ");           
          Serial.print(results.value, HEX);    // IR decode
          Serial.print(",  bits: ");          
          Serial.println(results.bits);        // IR codes
          irrecv.resume();                    // Continue to receive next IR code 
          if(results.bits == 32){ //only 32bit code will be evaluated
              /*All these buttons switch lights */ 
              case bitLight1:
              case bitLight2:
              case sanyoLight1:
              case sanyoLight2:  
              case 0x992A2843: //Benq Remote Green button for test
                   LEDstatus = 3; //switch relay;
              case bitLED1:
              case bitLED2:
              case sanyoLED1:
              case sanyoLED2:
                    //Check LEDstatus and switch to next mode
                    LEDstatus += 1;
                    if(LEDstatus >= 3){ 
                        LEDstatus = 0; //LEDstatus only has 0,1,2 if == 3, reset it to 0;
              case bitLEDspeed:
              case sanyoLEDspeed:
                        colorShiftTimeCounter=1; //only 4 elements, from 0~3
            } //switch
          } // check 32bits
        } //end of get a remote code
        return LEDstatus;
      void setColourRgb(unsigned int red, unsigned int green, unsigned int blue) {
        analogWrite(redPin, red);
        analogWrite(greenPin, green);
        analogWrite(bluePin, blue);
      void loop(){
           case 0:
           case 1:
           case 2:
           case 3:
              LEDstatus = 99;
           default: // set it up to do nothing, but wait the remote code to activate
        //constanly check new remote code
        LEDstatus = checkRemoteCode();
        //////Serial.print("LEDstatus: ");Serial.println(LEDstatus);
      } // end of loop
      Here is the prototype in the photo below.

      In next tutorial, I will show you the 2nd phase to put everything together and install the whole system in the celling light.  See you soon!