RadioLocman.com Electronics ru
Advanced Search +
  

11-08-2010

High Power LED mood Lamp

Toon Beerten

Introduction

In this page we will introduce a great project designed by Toon Beerten. His project named "DIY Led Mood Lamp" can become a very interesting add-on for your room that's absolutely sure it will impress everyone. As you can see on the photos, we talk about a color fading lamp, that looks amazing!

High Power LED mood Lamp

The purpose of this page is to try to give some hints building it successful. This high power led mood light is based on PIC16F628 and the ability of this mcu to produce PWM pulses. Varying pulse width we can produce millions of color combinations using only the three basic colors. So only one RGB (Red-Green-Blue) led is capable producing a rainbow of fading colors.

High Power LED mood Lamp

With the help of four switches we can handle all functions of the lamp. We can choose fading or jumping between colors, we can select a rainbow style or a random color changing behavior, we can choose slow or fast changing of colors and we can pause on a desired color.

Finally we will make some power dissipation measurements to help us select an appropriate power supply unit.

Housing for best color diffuse

You can use your imagination to find a housing that will be able to diffuse colors uniformly. Color difussion is necessary to achieve best results. In original design the author used the 45cm IKEA Mylonit lamp. That's a great housing for your lamp. Instead you can use the smaller 31cm IKEA Mylonit lamp with the same amazing results. That's the lamp we used in our construction.

In our research we found other lamps (ex. sphere shape) that are ideal for housing your big led.

High Power LED

The led used is a high power 3W RGB LED. It can be found on ebay at LEDSEE-electronics. You can also check ebay for other high power RGB leds. It will do the jod the same way. Details of this brilliant led shown below.

3W high power RGB LED

3W high power RGB LED

Light Angle of the LED

140 degree

Nominal current B,G,R

350mA

Forward voltage

Red

Typ 2,2V

Green

Typ 3,55V

Blue

Typ 3,55V

Wavelength of the LEDs

Red

Typ 625nm

Green

Typ 530nm

Blue

Typ 470nm

Luminous Intensity

Red

Typ 32lm

Green

Typ 35lm

Blue

Typ 10lm

LED type: Common Anode

 

Note: Minus on the bottom right pin
is common anode (positive voltage)

Schematic

The schematic used is shown in the next image. It's as simple as it shows. Take care on the correct transistor mount and correct polarity of power source.

High Power LED mood Lamp
Click to enlarge

BC337 Pin out
BC337 Pin out

Parts List

 Here is a list of the components i used for making the led mood lamp.

  • 3 x NPN transistors capable of driving 500 mA, for example the BC337
  • one PIC 16F628(A) and a programmer
  • a small perforated circuit board
  • 7 x 10K resistors (1/4W)
  • 1/2 watt resistors (2x 22 Ohm, 4x 10 Ohm) and a DIP switch
  • a power supply (5 volts, 500 mA)
  • Ikea Mylonit lamp or other housing
  • silicon paste from your local DIY shop (if you want to use a heatsink)
  • one z-power 3 watt rgb led
  • a little heatsink and some cooling paste (if you want to use a heatsink)

Circuit board

On the next image you can see the circuit arranged on a perforated board.

High Power LED mood Lamp

Programming The PIC 16F628 Microprocessor

Just use your programmer and upload the .hex file on your PIC.

Download Source Code

For successful results you should pay attention on the fuse bits. You should enter the correct fuses as noted on the following table.

Fuses
IntRC I/O Enabled
PWRT Enabled
BODEN Enabled
MCLR Disabled
Rest of fuses Disabled

DIP Switches functions

  • SW1 - makes you choose between G->GB->B->BR->R->RG-->>G effect and random color change effect
  • SW2 - makes you choose between fading and jumping from one color to another
  • SW3 - makes you choose between slow or fast
  • SW4 - pauses at the current color displayed

Mounting

A good way to mount the circuit board is to use a hot glue gun to "mold" the circuit underneath the lamp housing. There is plenty of space there for your board. At the next photos you can see the circuit board mounted on the small 31cm IKEA Mylonit Lamp.

High Power LED mood Lamp
The glue is still hot. Temperature of glue didn't damage the PIC or other parts.

High Power LED mood Lamp
The glue is now cold and you can easily access the dip switches. Lamp is working!

High Power LED mood Lamp

A view from top of the lamp.

Update - 10/2009

Steve Rougier made improvements on the original code and schematic adding additional operation modes. For detailed info and for updated source code check on this zip file.

electronics-lab.com

You may have to register before you can post comments and get full access to forum.
User Name

News on theme:

Slices ↓
Radiolocman facebook Radiolocman twitter Radiolocman google plus