The Awesome and Cute AVR-based Programmable LED

Programmable LEDs are those projects that have been fully-programmed with numerous LEDs. In this case, the idea is to make the LED blinking sequence reprogrammable. Basically, the reprogramming can be easily done with light and shadow. Today, you’re giving the chance to build an awesome yet cute AVR-based Programmable LED. Before you’re building a programmable LED, you must first prepare the following materials: Two 1K resistor A Light Dependent Resistor A Low Current LED (1.7V, 2ma) An Atmel ATtiny13v, 1KB flash RAM, 64 Bytes EEPROM A CR2032 (3V, 220mAh) Soldering iron and wire Breadboard AVR programmer 5V power supply Multimeter The reason why the ATtiny13v is used because this version is able to run at 1.8V. In this case, it is possible to run the circuit with a very small battery. If you want it to run for a very long time, you might want to use a low current LED, which is able to reach full brightness at 2ma! Continue reading

Even Your Desktop Deserves a Clock As Well!

You’re thinking that your desktop is too plain and you would like to do something with it? Ok, what about a stylish LED Desktop Clock? Yeah, it’s sounds cool, isn’t it? Basically, this project is uses RGB LEDs to create a clock face and each of the hand is assigned with a color and as the hands overlap on the face of the clock, it will then mix the colors! The clock will use a single AA battery to power the display, where it is boosted to 5 volts with a switching mode power supply. Then, the power supply would be fined to use any AA battery that is at 0.7 volts or even higher. This means that it should still work fine with AA batteries, which maybe “dead” when used in other devices! For this project, make sure that you’re using DS1307 for the heart of the clock and with a CR2032 coin cell battery backup as well! Remember that the battery should also be sufficient, so it can keep the time for at least a couple of years!… Continue reading