YourITronics

T-Clock is a demo-application for Philips LPC2000 ARM7TDMI controller with a KS0108/KS0107-based graphics-LCD (128*64 pixels), DCF77 time-receiver and one wire bus (for DS18×20-Temp.-Sensor).

The time and date are received with a DCF77-receiver-module. The DCF77-signal is transmitted from a station near Frankfurt/Main, Germany and can be received all over Europe, North Africa and the Middle-East. Please visit www.ptb.de and ask google with “DCF77″ for more information. In times when the DCF77-signal is not available (i.e. thunder and lightning near transmitter) the RTC of the LPC-controller is used to drive the clock.

The clock also display the temperature measured trough a DS18×20 family sensor. he sensors provide the temperature in digital form on a One-Wire-Bus. The Maxim Web-Site has a lot of information on the One-Wire-Bus.

The whole project should cost you about 100 Euro’s, not cheap but a very good and interesting project for ARM microcontrollers.

T-Clock An ARM7 Controlled Blue LCD Clock: [Link]

This is great project demonstrating an organic LED display interface. ARM7 (AT91SAM7S64) microcontroller displays and analog clock face on OLED screen which has 18 bit color range and is low power. Project uses DS3234S RTC IC that is interfaced to ARM7 microcontroller via SPI port. Another interesting feature is that clock uses a light sensor TSL256 which enables to adjust displays brightness according to ambient light level. So in dark environment clock is dimmed while in bright room brightness is high. OLED allows 16 brightness levels.

ARM7 based OLED analog clock face:  [Via] - [Link]