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Functionality that requires better time control, such as
RGB LED DRIVER CONTROLLER UPDATE
Test new functionality on the computer than repeatedly update theįirmware.
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RGB LED DRIVER CONTROLLER SOFTWARE
Implemented in software (Python) on the computer. Most logic, such as flashing or slewing between colors, is That the switching regulators can run at slower speeds (500 KHz,Ĭurrently), at which they are more efficient.Īt least for now, the microcontroller is underutilized, withįirmware sufficient only for relaying messages to and from theĬomputer. (Actually, 3 PIC cycles are lost each block ofĤ096 to pulse BLANK, so the frequency is just under 500 Hz.) 500 Hz isįast enough that it should never be visible. The output on for a portion of each 4096 pulses, resulting in a PWMįrequency of 500 Hz.
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12-bit intensity values are output by the TLC5940 by turning OSC/4, which, at 2 MHz, drives the grayscale (GSCLK) counter of the PWM output of the TLC5940 to logic levels for input into the driver Finally, this board inverts the open-drain PIC16F887A microcontroller, which handles the timing andĬommunications with a TLC5940 LED driver for 12-bit PWM regulation ofĮach of 15 color channels. The controller implements communications with the computer by USB, This project is divided into two boards: 1) a controller (upper) and, 2) a set of switching constant current regulators (lower). Is required, which, without more equipment, was an inexact The result is that little color and white calibration This eliminates any need for current limiting resistors,Īllowing for accurate balance between the colors within an LED, andīetween LEDs. Regulators, 15 in total, to provide 500mA to each of 5 Lamina Atlas This handles computer communications and 12-bit pulse width modulation Includes the PIC microcontroller, USB communications, and one TLC5940. LM3402)įor accurate LED current control, and high efficiency. Redesigned to use switching current regulators (National Semi. Implements 2-way communication with the microcontroller.Īdditionally, and more significantly, the hardware has been It corrects several bugs in the software,įacilitating faster color updates from the computer (~250fps),Īllowing experimentation with fast, but 'smooth', color changes, and This project is a revision of my previous High Power RGB LEDĬontroller.