Matrix Clock

Introduction

The Matrix clock is a single board, highly compact, Arduino compatible clock that displays the time on an LED matrix display. The display and rich firmware library allow for animated transitions between minutes.

Based on the Arduino Leonardo, the Matrix Clock is fully compatible with the Arduino IDE and can be easily updated or customised with new sketches, uploaded via a USB Micro cable. A coin cell powered Real Time Clock Calendar keeps track of the time and date when the unit is not powered. The Matrix Clock can also play musical alarms that can be easily reprogrammed with different tunes. Due to its compact form factor the Matrix clock could be fitted in any number of housings - even a pocket watch style housing. If portability is desirable then the unit can be battery powered and a sleep function is available (by taking one of the expansion pins to ground) in order to extend battery life.

Features

  • 16x8 LED Matrix display
  • ATMEGA32U4 microcontroller
  • Coin cell powered Real Time Clock Calendar
  • Texas Instruments TLC5920 LED driver
  • 4 Buttons
  • Piezo speaker output
  • Sleep mode input
  • 2 power inputs, USB Micro connector or 6V - 9V DC in. (Normal powered by Vin switches when USB power is present).

Instructions

Specifications

Microcontroller Atmel ATmega32u4 in TQFP-44 package
Operating Voltage 5V USB powered or 6V to 9V
Power and communications USB Micro B
Current Approx 90mA average during normal operation Max. 300mA
LED Matrix 2x 8x8 3mm green LEDs
Clock speed Microcontroler 16MHz, RTCC 32.7
SRAM 2.5 KB
EEPROM 1 KB
Flash Memory 32 KB
Expansion Header Gnd, Vin, 5V, Sleep, Piezo-, Pezo+

Schematic

PCB

Licensing

http://i.creativecommons.org/l/by-sa/4.0/88x31.png

Matrix Clock V1 by Dan Hamer is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License

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