8x8x8 LED cube display

Everything that has 3D word attached seems cool today. So LED displays aren’t exception. Easiest way to make a 3D display is to build a LED cube. This LED cube is build of 512 or 8x8x8. It may look quite small resolution, but keep in mind that each LED has to be hand soldered in to nice cube and this is quite time consuming. Another thing is that more LEDs require more power to drive and more I\Os. Microcontrollers have limited number of pins so there are eight 74HC574 latch registers used. Each of them is decoded with 74HC138 chip. This gives 64 programmable pins out of 8+3. Add 8 more pins and you can scan through all of them. Instructable gives really detailed instructions on how to build one and program it. Continue reading

Graphical LCD clock with some retro

This clock has some modern and retro taste as it integrates nice old wooden box and an electronic alarm clock with Graphical LCD. Clock is controlled by ATmega32 microcontroller. Time, date and alarm are displayed on 128×64 standard GLCD. Its backlight also has some intelligence – the value of photocell determines when to turn backlight on. Clock settings are managed via simple menu, where you can set time, date, alarm clock, backlight values and see “About this clock” info. Putting modern things in unusual “retro” looking cases makes them really attractive. Continue reading