This project shows how to build a rechargeable led flashlight powered by magnets and housed in a mints container. Check details on the link below.
Rechargable LED Flashlight – [Link]
This project shows how to build a wind generator using common materials.
Wind power is abundant, clean, inexpensive and easy to do. It is our belief that anyone can be in control of where his or her electricity comes from. There is nothing more rewarding and empowering than making a wind powered generator from scrap materials.
How to build a Wind Generator – [Link]
user drj113 on Instructables writes:
This Instructable will show you how to make your own original stylophone – The schematic that this is based on is my own, so it is free from Intellectual property restrictions. It is based around a 555 timer (so it could be an extension of the recent “Know Your 555 timer” article), and uses an ubiquitous LM386 audio amp so it can have enough volume to stand out from the crowd. [via]
DIY Good old fashioned stylophone – [Link]
This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright white LEDs. The LEDs are connected in parallel to the output pin 8 of the IC. The circuit has good battery life. The switch S1 can be a push to ON switch.
LED torch using MAX660 - [Link]
This project is a flasher circuit able to turn on and off a bulb instead of a LED. It is based on the 555 timer IC is connected for astable multivibrator operation. It will create a flashing condition on the brake lights while the brake is pressed.
Automotive Brake Lights Flasher Project - [Link]
This project is a tiny, lightweight LiPo battery voltage monitor/alarm system based on PIC microcontroller. [via]
This simple PIC project includes a simple A-to-D application that measures the voltage of a battery pack via a resistor divider network, compares it to a reference voltage (5v regulator) and then displays the battery voltage on 2 LEDs (indicating battery voltage strength).
Simple-Volt: LiPo Monitor System – [Link]
Learn more about PWM in this in depth discussion.
Michael Kleinigger writes:
Pulse-width modulation. It probably sounds a little confusing if you’re new to electronics. Kindof a word mashup, really. What do pulses, width, and modulation have to do with each other anyway? I remember first learning about PWM during my freshman year of college at RPI. I was in a pilot course called “Foundations of Engineering” under the excellent instruction of Professor Kevin Craig (whom I later worked for). I remember thinking later, “Hey, this PWM stuff is pretty clever!” So let’s take a look at PWM and see what we can learn.
Discussing Pulse-Width Modulation - [Link]
This project is a prototype mouse using a LED and 4 photoresistors to detect motion.
The photoresistors are detecting the light emitted by an LED and refracted by your hand, allowing you to control your cursor simply by moving your hand over the sensors. the closet you are from the sensors, the faster the cursor will be. It’s not ergonomic nor commercially viable, but it’s a nice experiment to do. The firmware detect the position of any object on top of the sensors. You can find the code here: http://pastebin.com/H3kzkbK2
Computer mouse using LED and photoresistors – [Link]
This ethernet enabled shield is able to deliver power to connected devices using Power over ethernet technology. It uses the same cable used to transmit data to deliver power to connected sensors and modules. This can be messy to implement but this ethernet shield make things easy. You just plug it in, hook up a single power supply at your router, and you are ready to go! [via]
Ethernet Shield for Arduino with Power-over-Ethernet – [Link]