All posts in the 'LED projects' Category
Posted on 24 Jul 2008
POV stands for Persistence Of Vision. It’s a term that’s been applied to devices that rely on the eye’s tendency to continue to “see” an image for a short time after it has disappered. This is also what causes the apparent blurring of objects that are in motion (like an airplane propeller).This project consists of three circuit boards with a row of 32 LEDs on each .The circuit boards are mounted radially in the spokes of a bicycle wheel and batteries near the hub supply power to them. The LEDs are controlled by a microcontroller that measures the rotational speed of the wheel by way of a hall effect (magnetic) sensor. As the wheel rotates, the microcontroller turns the individual LEDs on and off in such a way that a static image appears to float inside the wheel.[more]
Posted on 15 Jul 2008
“Aletheic” is a free-standing sculptural piece using 4 infrared sensors that trigger light patterns in a grid of 64 LEDs controlled by Stamp2sx and MAX7219. The values sent from the sensors are combined into a weighted average that controls the individual brightness of each LED. Moving your hands around in the sensor IR beams triggers shifting wave patterns through the LED grid.[more]
Posted on 15 Jul 2008
Olivier writes:
The idea of this project came from my youngest son. He was dreaming of a small tool able to write symbols or pictures on a screen. As a graphic LCD (even bought at Crownhill 
) was too expensive (or too easy??), the solution adopted was to pilot a matrix of Leds. This way, with only some cheap transistors, common red Leds, and a 16F628 , the dream could become reality.
[more]
Posted on 28 Jun 2008
Here is a modded IKEA lamp based on PIC16F84 from Micrcochip.The light bulb is 1-watt RGB led driven by Microchip PIC16F84.The device includes a 1-wire thermometer and an ethernet interface (with a TCP/IP stack).There are two modes:First, Thermometer mode: lamp changes its color depending on the ambient temperature and the second is Ethernet mode: one can remotely control the color of the lamp.[more]
Posted on 26 Jun 2008
The module consists of a Atmega8 microcontroller. It uses PWM to control 3 different LED’s found in a RGB Led. Because it uses PWM to control the 3 colours we can also control the brightness of the colours. This allows us to create various colours using the three original colors (Red,Green and Blue).[more]
