Recently we got these really cool RGB blubs that are controlled by an IR remote control. You plug them into your house hold light bulb socket and presto, you can set the mood of any room! There were a hit with just about all our friends and no party was ever complete without them. We thought it would be cool to see how they work and offer their internals up for sale on our website. This tutorial will show you how to read IR commands from a remote and play them back to control the RGB bulb.
Hardware and Assembly:
If you want to follow along with this tutorial, you will need:
RBG 3W or 10W Module
Pro Micro 16 Mhz/5V
IR Reciever
IR LED
3 AA Battery Back (3 Watt Version Only)
Breadboard
Jumper Wires
We used a Pro Micro because of its small size but you can use any microcontroller you have laying around. We will be using an Arduino IR library in this tutorial so using an Arduino will make it easy to follow this tutorial.
Above you can see the two different size LED bulb kits that we have. We have a 3W and 10W version. Both are full RGB and have four pins. Three of the four pins control each of the colors and the fourth one is a common anode (VCC). The only difference between the two besides the power output is the VCC input. The 10W bulb requires 12 volts instead of 5 so it will not work our 3 AA battery holder.
Lets start putting it all together. Start by adding some solder to one of the four pads. We will solder one pad down to hold the LED bulb in place before we solder the other other three legs.
You can see each lead on the PCB is marked R,G,B, and Vcc. Use your favorate tweezers to align the bulb to the correct leads while melting the pad with your soldering iron. You can see in the above picture we have a nice blob of solder to melt before placing the lead into it.
Now you can solder the other three leads of the bulb and your done mounting the blub. You can see the finished product above. Time to add a battery holder to power the bulb.
Always tin the leads of the wires so it is easier to solder to the pad.
Solder the red wire to the lead marked VCC.
Solder the black wire to the lead marked GND.
Go ahead and put 3 AA battries in your holder and the bulb should come on and automatically play a demo. You can bairly see it because of our camera flash but the bulb is on. It is much brighter then it looks!
Wiring:
Now that we have our bulb working, we can move on to controlling it.
The diagram above shows how to wire up the IR reciever and transmitter LED to the Pro Micro.
Above you can see what your completed breadboard should look like when your done.
Recieve Code:
The module comes with a remote which we will use to read the commands. For this tutorial we will use the IR library written by Ken Shirriff which allows you to receive and transmit infrared control codes to anything you like. The latest version of the library can be downloaded here. Once you have downloaded it, open up the example called "IRrecvDemo".
#include <IRremote.h>
const int RECV_PIN = 2;
IRrecv irrecv(RECV_PIN);
decode_results results;
void setup()
{
Serial.begin(9600);
irrecv.enableIRIn(); // Start the receiver
irrecv.blink13(true);
}
void loop() {
if (irrecv.decode(&results)) {
if (results.decode_type == NEC) {
Serial.print("NEC: ");
} else if (results.decode_type == SONY) {
Serial.print("SONY: ");
} else if (results.decode_type == RC5) {
Serial.print("RC5: ");
} else if (results.decode_type == RC6) {
Serial.print("RC6: ");
} else if (results.decode_type == UNKNOWN) {
Serial.print("UNKNOWN: ");
}
Serial.print(results.value, HEX);
Serial.print(" Bits:");
Serial.println(results.bits,DEC);
irrecv.resume(); // Receive the next value
}
}
The "IRrecvDemo" allows you to see the codes being sent from the remote to whatever it is you are trying to control. To send IR codes using this library, we need to know three things. We need to know the code, type, and the number of bits in the code. The first change you will notice from the original demo is the pin number. Since we do not have a pin 11 on the Pro Micro, we simply changed it to pin 2. The next thing we added was the "if structure" to check which type of code it is and print it to the serial terminal. Finally we added the "Serial.println(results.bits,DEC)" to show us the number of bits in the code.
Next you can point your remote to the IR reciever and press any button on the remote. Above we pressed the Red, Green, Blue, Yellow, On, and Off in that order. Each button press gives us a lines in the serial terminal (except the last one which gives us two). You can see that the hex code "FF906F" represents a Red button press and it is a 32 bit NEC code. Similarly we have the codes for the other buttons we pressed. The reason the last button gave us two lines is because we held the button longer. The remote we are using simple sends blank codes when the button is held down.
Time to send try sending these codes ourself and control the IR module! For this we will use the IRsendDemo and add our codes to control the LED module.
#include <IRremote.h>
IRsend irsend;
void setup()
{
Serial.begin(9600);
}
void loop() {
irsend.sendNEC(0xFFE01F,32); // Turn on the Bulb
delay(50); // Wait 1/10 of a Second
irsend.sendNEC(0xFF906F,32); // Make it Red
delay(50); // Wait 1/20 of a Second
irsend.sendNEC(0xFF10EF,32); // Make it Green
delay(50); // Wait 1/20 of a Second
irsend.sendNEC(0xFF50AF,32); // Make it Blue
delay(50); // Wait 1/20 of a Second
irsend.sendNEC(0xFF8877,32); // Make it Yellow
delay(50); // Wait 1/20 of a Second
irsend.sendNEC(0xFF609F,32); // Turn the LED Off
delay(2000); // Wait 2 Second
}
In the above example, we have added the codes that we found using the IR recieve demo. We are simply playing them back one by one every two seconds. The library will automatically control Pin 8 on the Pro Micro since it uses the Atmega32u4 processor. If you decide to use an Arduino based on the Atmega328P, you will want to use Pin 3.
That concludes our IR Controlled RGB tutorial. Now you can control the color of the LED from across the room! Let us know about your cool projects so we can feature them on our website! If you have any questions about this tutorial, don't hesitate to post a comment, shoot us an email, or post it in our forum!