hColorLED

Monday, April 21st, 2008

Contents

hColorLED

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v1.0

C source code

hColorLed is a AVR USB MCU firmware to manipulate tricolor LED, with color transition and timing, controlled through USB-HID (Human Interface Device) by computer host.

This is a demostration implementation of my UsbAvrUsb project.
With this device, I could control a Red, Green and Blue LED through a user-space program from my Windows. The program accepts RGB or HSV input, with timing parameter to control the speed of transition.

The LED has a 15-bit color resolution theoretically (32 brightness grades for each primary color). The brightness is controlled by PWM, with a 128Hz cycling rate.

Usage

Currently this can only compiled by avr-gcc. Windows user might want to check out WinAVR. Once the zip file is unpacked, it should able to built by avr-gcc.

For the implementation details and protocol, please refer to the next page.

Please also refer to the my UsbAvrUsb project, the library that this software is built upon. Also UsbHid, a C# program for controlling USB-HID device in Windows.