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]
Justin Huynh build an Open Source Ebook Reader based on Beagleboard OMAP platform by Texas Instruments. Ebook reader Hardware is based on a number of modules such as: Liquidware BeagleTouch OLED module, and a BeagleJuice Lithium Ion battery power pack and Software is based on the open source FBReader by Geometer Plus. [via]
DIY BeagleBoard-based Open Source Ebook Reader - [Link]
I’ve always wanted to build an electronic led dice, but something different from what we see on the internet. Making it motion controlled… now that’s new! Many new cell phones that have accelerometers built in also have dice games. These dice move when shaking the cell phone. My Led Dice project will also work with a shake motion but without the use of the expensive accelerometers.
Motion Activated Led Dice - [Link]
A2601 is an FPGA-based clone of the legendary ATARI 2600 video console, developed completely by retromaster.wordpress.com, including VHDL code and a custom PCB. Retromaster recreated 6502 CPU in FPGA along with TV interface which enables NTSC TV and audio playback. Check project details on the link below.
A2601: FPGA-based clone of the ATARI 2600 - [Link]