LED VU meter Does your amplifier have a level indicator? I always envied the fancy amps with LED level bar graph that you find on most stereo systems or amplifiers. This is your chance to build your own LED VU meter that you can link to your amp and watch it in action. The application is based on LM3915 chip. This is a monolithic Dot/Bar Display Driver IC made by National Semiconductor. It takes an analog voltage input on pin 5 then drives 10 LED’s providing a logarithmic 3dB/step analog display. Digital Clock with PIC16F84A This is a small ajustable clock, It’s made based on PIC16F84A microchip.The hardware part is very simple because it only uses 74hct238 demultiplexer, 4×7 segments, and some rezistors. The software part is programmed through a device connected to serial port with icprog and made/debuged with MPlab. AVR audio spectrum analyser on dot LED matrix display This AVR fast Fourier Transformation implementation is actually a modification of Chan’s Audio spectrum monitor. Program is implemented on Futurlec Atmega32 control board. Cemo has adapted this project for 16×16 dot LED matrix display. You can download the entire project from AVRfreaks (including demonstration movie). DIY LED Heart We live in the information age. Your phone knows where you like to eat, computer programs know what movies you like better than you do, and going to a party can mean going in this life, or a Second Life. So why is your message of love still stuck in the 16th century? These days it takes more than a sonnet to melt a girl’s heart. This video tutorial shows step-by-step how to make a Valentine’s Day card for the digital age. The NerdKits team shows how to make an LED Heart Valentine’s card powered by a microcontroller. The heart features an LCD screen for a personalized message, and 20 LEDs around the perimeter that can be programmed to show any pattern. The code provided contains a “twinkle” function that randomizes the process to provide a true star-like twinkle. Triangle LED Animation This project uses the Simple LED Animation Kit (SLAK post) with red/green LEDs arranged in a triangle. The three sides of the triangle are connected in parallel. Even though there are 18 bicolor LEDs (36 individual LED elements), the PIC16f628A is controlling only 6 bicolor LEDs (12 individual elements) and these are duplicated around the triangle. Digital Clock This project is a clock that displays the time and date on seven segment led displays.Designed by Perry Andrews. Two buttons are used to set the time and date. The program takes care of changing the date and keeping track of leap years. He recommend all displays are purchased at the same time otherwise a difference in brightness may occur. This page contain documentation, circuit diagram, ‘C’ program and Hex code. LED Desktop Clock This project uses RGB LEDs to create a clock face. Each hand is assigned a colour and as the hands overlap on the face of the clock it mixes the colours. The clock uses a single AA battery to power the display which is boosted to 5 volts with a switching mode power supply. The power supply should be able to use any AA battery that is at 0.7 volts or higher, which means that it should still work fine with AA batteries that may be “dead” when used in other devices. The heart of the clock is a DS1307 realtime clock with a CR2032 coin cell battery backup. The battery should be sufficient to keep the time for at least a couple of years. Birth Clock The “Birth Clock” is a fragile glass object containing a digital clock that is not working; it is designed to help you to come to a decision when you’re stuck at a specific point in life. Smash the glass, and the clock will start to work, leaving you with the broken object as a reminder of your dramatic decision. Leave the object as it is, and you remain out of time, having the beautiful object as a reminder of your resistance to change. What would you do? |
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