Do you know what the people used to measure time in the ancient? Yeah, they used a device named “Sundial” to measure time by the position of the Sun. In common designs, the sun casts a shadow from its style onto a flat surface marked with lines indicating the hours of the day!

When the sun moves across the sky, the shadow-edge progressively aligns with different hour-lines on the plate. By the way, you might find this Bulbdial clock is much fascinating than the sundial clock, as it not just equipped with hour hand, but a minute and second hand too!

In this project, an ATmega168 microcontroller and a 16 MHz crystal oscillator are the main components. Beside that, it has three tactile button switches, where two of them are used for setting the time and the other button is responsible for turning on or off the LED!

By the way, this Bulbdial clock is built with three rings of LEDs at different heights. You can only turn on one LED within each ring! The three rings having it own color, which as red, green and blue. Furthermore, each ring has 12 LEDs, which means you’ll need 36 LEDs for the Bulbdial clock!