LCD-Clock

This is yet another DIY clock. An Atmel AVR controller is used to drive a text-mode LCD (HD44780 and compatible) to show the time in big letters. The letters are drawn with user-defined characters. The AVR's main clock is the internal R/C-oscillator. The RTC-clock is driven in async mode by an external 32kHz Watch-Crystal. The code is written in C using avr-gcc with the avr-libc and P. Fleury's textmode-lcd library for gcc.

Credits: Peter Fleury for his lcd-library. www.mikrocontroller.net/forum -> Codesammlung for the character patterns.

Changelog

6. Sept. 2004 - web-page
7. Sept. 2004 - source-code V1.0
2. June 2005 - avr-libc 1.2.3 compatibility
12. Oct. 2008 - minor updates, AVR-Studio project-settings, no new function

Hardware

Atmel AVR-Controller (ATmega16 @ 1MHz int. R/C used for prototyping)
Text-Mode LCD with at least 4 lines and 15 characters (16*4 module used for prototyping, Displaytech164A)
RTC with timer in async-mode using a 32kHz Watch-Crystal
2 Buttons for clock-setting

Picture Gallery

Software

Download the Source-Archive (Timestamp 20081012)
Please read the readme.txt file included in the source archive.

back to my AVR projects page

Martin Thomas

08465 hits since
Last mod.: Sunday, 12-Oct-2008 03:08:41 CEST