by Colin Jeffrey @ gizmag.com:
In the pursuit of ever-shrinking circuitry for nanotechnology electronics, increasingly smaller devices and components are being developed. Now researchers at the University of Konstanz and the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) claim to have micro-miniaturized the humble electrical switch all the way down to molecule size and proven its operation for the very first time. Unable to flick such a tiny switch mechanically, however, the researchers instead used light to turn it on.
World’s first light-activated, molecule-sized switch gets turned on – [Link]
Theory of operation remain the same so please take a look at the previous Article about MAINS Power Switch for deeper explanations.
I don’t know if this it’s the smallest MAINS Power Switch with integrated WIFI and direct Web interface access but if is not, it’s definitely closer to be at only around 25x50mm
ESP8266 WIFI Web Power Switch for MAINS – [Link]
Razvan Dubau over at Extragsm posted a how-to on using an ESP8266 module as a wireless switcher:
A custom firmware to transform the ESP8266 wifi module into a wifi http based switcher GPIO02 is used as an output pin. You can connect a led or a relay and control it by a button added to GPIO00. Also the firmware provides a web interface and a simple API that will controll the GPIO02 state.
Use ESP8266 module as a wireless switcher – [Link]
Thanks to a simple adapter, MEC Unimec switches can be used even in places, where their original height wouldn´t be sufficient.
We already know, that Switches MEC Unimec switch in up to eight ways and also that they´re available as momentary or alternate (latching). UNIMEC switches feature perhaps only one “disadvantage” – that on the same PCB no other higher components can be used (which would be higher than the switch). If you´re satisfied with the UNIMEC features, but despite that you cannot use them in your application right for their (low) height, we have for you a solution. It is based on usage of the „16270 extender“. In combination with any right-angle cap of the 16300 series and with a prolonged bezel 16324 (16325,16326) we gain by this combination a switch higher in 4.5 mm. This simple solution is also suitable for cases don´t have high components on a PCB but from any reason it´s advantageous, when some room will be left between a front panel and a PCB (for cooling, …) Detailed information will provide you the MEC 16324-16326 brochure and the Unimec datasheet. Selected types are in stock and upon request we´re able to provide you any other components from MEC.
MEC extender – and you’re a level higher – [Link]
The UltraCMOS® PE42020 Integrates RF, Digital and Analog Functions in a Monolithic Die to Preserve Signal Integrity From DC to 8 GHz
Peregrine Semiconductor announces the availability of the UltraCMOS® PE42020, the industry’s first and only RF integrated switch to operate at true DC, zero Hz. This True DC RF switch features high power handling and maintains excellent RF performance and linearity from DC through 8000 MHz. A reliable alternative to problematic mechanical relays and micro-electro-mechanical systems (MEMS), the PE42020 is ideal for test-and-measurement (T&M) and automated-test-equipment (ATE) applications.
“For the first time, an integrated RF switch can operate at DC and truly cover the signal over the entire frequency spectrum,” says Kinana Hussain, Peregrine’s senior manager of marketing. “Until now, only mechanical relays and MEMS switches allowed DC pass through, and these products are plagued with reliability issues and lack of integration. Today’s release of the UltraCMOS PE42020 is another example of Peregrine solving the RF industry’s biggest challenges.”
Peregrine Semiconductor Ships Industry’s First True DC Switch – [Link]
Raj over embedded-lab.com has build a prototyping board that facilitates the building of simple circuits. It includes a regulated power supply for both 3.3V and 5V, four output LEDs, four input switches, a buzzer, a potentiometer and an onboard breadboard. Using this board you can fast prototype your next project.
Experimenter Prototyping Board for easy circuit build – [Link]
With a package outline of just 1.2 x 2mm the Micrel MIC95410 is able to switch loads of 7A in the voltage range of 0.5 to 5.5 V. The switch provides high-side switching and the company anticipates it will find applications in the field of computing generally and in ultra-dense embedded computer boards where high-current, low-voltage rails from sub-1V to 5.5V are required to be sectioned. The integrated 6.6 mΩ RDS(ON) N-channel MOSFET ensures low voltage drop and low power dissipation while delivering up to 7A of load current.
A separate 2.7 to 9 V supply is necessary to power the chip’s logic. The chip also includes a TTL-logic level control input (CTL); a high level enables the switch and a logic low level disables the switch and discharges the output. The OFF-state current from the bias supply (VS) and the power switch OFF-state leakage current (IOFF) are both below 1μA. A capacitor can be connected at the GC input to provide switch slew-rate limiting to help reduce inrush current to the input supply voltage.
Tiny Power Switch good for 7Amps – [Link]
by alistair_uk @ instructables.com:
This is a very low cost and basic from of home automation allowing you to turn on and off lights and other devices using your computer or mobile phone.
It has been built and tested use using UK power plugs, but the same protocol is used on many budget remote power switchers from around the world.
Internet Controlled Mains Switcher – [Link]
by DIY Hacks and How Tos @ instructables.com:
The Clapper was a popular gadget in the 80’s and 90’s. It let you turn appliances on and off just by clapping. This can be pretty useful, but it has some limitations. First there is the problem of loud noises accidentally turning the lights off. Also, you can’t control multiple outlets independently of each other.
So I decided to make programmable version of the Clapper using an Arduino microcontroller. The Arduino lets you set codes for each outlet. This eliminates false triggering and lets you control multiple outlets independently. Your lamp could be turned on and off with one clapping pattern and your fan could be controlled with another pattern.
Sound Activated Outlet – [Link]
by Peter Demchenko @ edn.com:
The purpose of this Design Idea was to improve reliability, add new features, and replace a latching power switch with a momentary one.
The features are:
The switch has foolproof protection against too frequent switching, which can be harmful for many applications.
It can handle significant power because manual control and switching are separated.
If an unexpected power outage occurs, the switch disconnects and remains off after power returns.
A unit can switch itself off.
Momentary switch controls mains with latch-on and remote shutdown – [Link]