This video shows a LED powered by a 0.1 Farad capacitor. First the capacitor is charged at 5V and then it is discharged through the led. The led is light for a few minutes after power is disconnected.
Led powered using Super Capacitor - [Link]
This project shows how to build a 24×6 LED matrix driven by an Arduino board. It uses 3 shift registers to control the columns and a 4017 decade counter IC with 6 transistor for scanning the rows. Check schematic and project details on the link below.
DIY 24X6 LED matrix – [Link]
This project shows how to build a LED matchstick that is light up if strike it against a normal matchbox filled with neodymium magnets.
The LED matchstick has an inductive sensor that detects the magnetic field as you strike the matchstick against the matchbox and it lights up a LED in a flickering fashion. The power to the matchstick is through a 3F/2.7V supercapacitor and a DC-DC converter. As the LED lights up, the supercapacitor discharges and eventually the matchstick splutters off just like a normal matchstick.
Fire-free LED Matchstick – [Link]
This project shows how to build a LED circuit that is pulse fading – breathing like the “Macintosh” style LED fade off effect. The circuit is using plain electronic components like transistors, resistors and capacitors. To make LED fade on and off you just have to push a push button or trigger the input using square wave from a 555 timer IC. The producing effect is really nice. Find schematic and project details on the link below. [via]
Led throbbing – pulse fade without mcu – [Link]
This project uses old fashioned LED displays to build a LED wristwatch that looks really cool. The heart of watch is PIC16F628A microcontroller and there is a separate oscillator to keep track of time. Check details on the link below.
LED Wristwatch - [Link]
Light Emitting Diodes more frequently known as LEDs are semiconductor devices that converts electricity in to light. It hard to find a gadget or other device that doesn’t use LED diodes. They are cheap they are simple to use and they are small. LEDs can emit different light colour depending on different chemical compound material in a semiconductor.
Driving LEDs – things everyone needs to know - [Link]
LED Calculator – [Link]
Kenneth Finnegan build a Bicolor LED clock based on MSP430. Project is developed using low cost Launchpad development platform from TEXAS Instruments. The MSP430 microcontroller is designed for low-power battery applications. The clock is controlled using a push button and a toggle switch. To display the time the LED is flashing in two different colors. Green flashes mean 10, yellow 5, and red 1, so the time 5:28 would be displayed as YELLOW [PAUSE] GREEN GREEN YELLOW RED RED RED (5:10+10+5+1+1+1) [via]
MSP430 Bicolor LED Clock – [Link]
This project is a LED bike light build inside an Altoids tin box. It uses a 12xx series PIC to control the LEDs. Hardware schematics, PCB layout & software is all available.
Mint Tin Bike Light - [Link]