RGB LED Love Heart

  
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This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th wedding anniversary (since she puts up with my addiction to electronics I thought she deserved something in return!). The love heart is made from a 200x150x6mm sheet of plexi-glass which is cut
RGB LED Love Heart - schematic

and sanded to create the optical effect and then mounted on the control board. Even if you are not into microcontrollers the display can be easily adapted to show any shape (or shapes) you like; furthermore any high-intensity LEDs can be used allowing you to create a static light display using little more than some LEDs, resistors and a power source. Note: The high brightness LEDs, PWM colour mixing and the varying intensities confuse my video camera a lot and it seems that the camera is overly sensitive to blue. Despite this I hope the video gives you some idea of how the display functions; the display outputs 35 unique colours fading between each. To build this project you will need some basic tools in order to work with the plexiglass. In addition you will need a PCB (printed circuit board) which you can either make yourself, or use my supplied Eagle CAD files to order a PCB from one of the many board producers available on the Internet. The controller board circuit diagram and PCB artwork are shown below. The Eagle CAD files for these items are included with the project files so you can adapt and alter the design to your needs (as is the firmware for the PIC12F683 written in HiTech PIC C). The board works by generating 3 software PWM signals from the PIC which control the overall brightness of the red, green and blue LEDs. Since the LEDs require 30mA per led colour the circuit must be capable of sinking 90mA per colour...



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