by w2aew @ youtube.com
The Humanalight is a simple single-cell flashlight kit that will produce usable light, even from a “dead” AA battery. Circuits like these are often called a Joule Thief. This term has been applied to just about any circuit that allows you to boost the voltage from nearly depleted batteries for some other low-power application – such as lighting an LED. Strictly speaking, a Joule Thief circuit is an Armstrong style blocking oscillator that uses a bifilar wound transformer and relies on the saturation characteristics of the core to produce oscillation. This flashlight uses a simple two-transistor relation oscillator. A description of the circuit is given, and its operation is examined by viewing the waveforms on an oscilloscope. The proceeds from the sale of this kit benefit the “Ears To Our World” charity which provides self-powered radios and other technology to rural, impoverished and remote regions of the world.
Circuit Walkthrough: A single cell LED light - [Link]
This project provides some lighting effect by the blinking pattern of the bulbs connected at its output. Up to 8 Bulbs can be connected in between connector CN2 to CN9 and AC power to control them should be connected at Connector CN10. DC Power should be applied at Connector CN11 in accordance with the polarity marked on this connector. Care should be taken while using this it as it contains Main Power on the board.
Microcontroller based running light controller - [Link]
by FabricateIO @ instructables.com:
Smart lightbulbs cost your firstborn child. Which is a shame, because smart lights unlock tremendous potential for home automation, energy savings, and all sorts of cool projects.
If only there was a way to control your lights without breaking the bank…
And now there is! For $19 on Amazon, you can get a 4-lightbulb kit from China that ordinarily is limited to 4 channels from a single remote…but with some creative hacking, can be used to control an unlimited number of channels using an arduino and a very simple RF module!
Cheap Arduino Controlled Light Sockets - [Link]
Wireless. Easier. Safer. Longer Lasting Christmas lights. by Chris Higgins & Hardeep Johar:
The first ever wirelessly powered Christmas lights
Smartphone controlled energy efficient LED lights
Outshines any of the average Christmas lights by 20 years
AURA: The first ever, wirelessly powered Christmas lights - [Link]
It’s not often that I finish the various small projects I undertake. Tesla coils, mass spectrometers, automated tomato plant watering systems, homebrew heaters have all been conceived and sometimes parts bought and assembled with some even making it as far as working. This project however made it all the way to finished.
Bike Light Controller Re-Design - [Link]
by Dario Borghino @ gizmag.com:
Researchers at Tohoku University in Japan have developed a new low-cost flat panel light source that could pioneer a new generation of brighter, cheaper and greener lighting devices to rival LEDs. The device uses arrays of highly conductive carbon nanotubes to deliver evenly-distributed illumination with high efficiency and a power consumption as low as 0.1 Watts – about 100 times lower than that of light-emitting diodes.
Cheap, ultra low-power light source runs on just 0.1 Watts - [Link]
by By Ben Coxworth @ gizmag.com:
It’s the big paradox of emergency-use flashlights … by the time you eventually need to use them, their batteries have died. Eton’s new Blackout Buddy H2O, however, will reportedly still work after sitting for up to 10 years. And to turn it on, you just add water.
This latest member of the Blackout Buddy line has a magnesium-oxide battery, which starts delivering power to the light’s three LEDs when exposed to H2O. To initially fire it up, you dip it into a small cup of water, or pour water into its battery compartment. After that, it will keep going continuously for up to 72 hours – if it starts to dim within that time, you simply add more water.
Blackout Buddy H2O runs on water to provide emergency lighting - [Link]
Davide Gironi writes:
A Spark.io library for the BH1750FVI IC.
The BH1750 IC is a light intensity sensor module with built-in a 16 bit AD converter generating digital signal. With the BH1750 Light Sensor intensity can be directly measured by the luxmeter, without needing to make calculations. This library provides function to measure lux through I2C on a Spark Core.
Measure brightness in Lux using BH1750 sensor on Spark core - [Link]
by Vadim Panov:
Back when I was only starting to dabble in electronics, I needed a project that would meet the following requirements:
simple to make;
original (i.e. done entirely by myself from scratch);
containing a microcontroller;
and maybe the most important of all, useful. I’ve had enough devices I assembled just to dismantle the whole thing a month later.
The thing I came up with at the time was a light swich for my room controlled over an IR remote from TV. Remote that I had used RC-5 protocol, hence the firmware is suited for any RC-5 compatible remote.
Everyone is familiar to the everliving problem with switching the lights off in your room before going to bed and stumbling back across the room. The IR switch I describe here solves that problem, and I can definitely tell that this project was a success – I am still using it with no regret.
Infrared remote controlled light switch with ATTiny2313 - [Link]
Just wanting to share one of my latest projects, made possible by DirtyPCBs. I got a lot of good boards (actually 2 designs) and saved 25$ using this service. Very nice.
It’s a simple thing, just a micro (ATmega168) + a bunch of WS2812B LEDs. Main purpose: more colours
It’s meant to fit nicely into IKEA Samtid lamps, runs with 5V DC and takes up to 2.75A. The control module is removable, so one doesn’t have to rip the lamp apart every time you change code. I used microMaTch connectors, as they’re somewhat low profile, at least compared to standard headers, and provide quite good mechanical support.
IKEA Samtid mood-light upgrade - [Link]