From time to time I get requests to make some high power switching, so I decided to design a solid-state relay that could handle a lot of different situations. The most common use for it I have is refurbishing old ceramic kilns. Since our technical life is close to the stage (both theatre and music), I also wanted it to be usable as a dimmer module. And, just for kicks, as a single phase AC motor speed controller, in case we would want that.
A solid-state relay with I2C interface - [Link]
by Publitek European Editors:
Led by solar photovoltaics, the market for harvesting energy from renewable sources is booming. At the simplest level, a single residence is equipped with a PV system, generating electricity for its own use, and feeding the excess back to the national grid. At the highest level are utility-scale PV plants and solar farms, contributing to improved grid resiliency and helping governments meet global targets to reduce CO2 emissions.
Meanwhile, the smart grid concept is emerging as the way forward to provide a much-needed upgrade to national electrical infrastructures. The deployment of smart meters and off-peak tariffs will help utilities meet peak demands without excessively increasing overall capacity. Techniques such as ‘demand response’ and ‘transactive energy’ will help us exploit renewable energy generation effectively.
Taking the Measure of Photovoltaic System Output - [Link]
The perfect gift for any electronics enthusiast or student. Although small, the Key-Scope performs as a fully functional oscilloscope.
Although small, the Key-Scope performs as a full functioning oscilloscope. You will receive the world’s smallest, high quality, low-cost oscilloscope realized in a key ring-type housing made in Italy. Priced below US$60, it serves as a useful gadget or gift to the electronics enthusiastic hobbyist. Since Key-Scope covers all major functions of a traditional oscilloscope, it also serves as a great tool supporting the electronics student to get familiar working with oscilloscopes.
World-smallest keyring-type oscilloscope with color LCD - [Link]
MAKE Magazine has just released Volume 36 focused on exploring the world of boards and including a detailed photo illustration of the evolution of Arduino.
Evolution of Arduino: the family tree - [Link]
I2C, SPI, RS232, all these are interfaces, through which eDIP series intelligent display are able to communicate.
Display with a good legibility even in non-optimal light conditions is always an advantage. When we add to it a significant simplification thanks to built-in character sets and graphic functions, we get a display of the eDIP a eDIP TFT series from company Electronic Assembly. Powerful command, touch panel and a high flexibility enable to shorten a development time to a minimum. To an easy usability als contribute very compact dimensions with a maximized screen area. Seven built-in character sets can be displayed up to 4-times scale and by one command they can be rotated in 90° for a vertical display. All character sets can be modified by a „Font tool“ utility and similarly it´s also possible to add your own sets. Commands like menu, clipboard, bargraph, draw, … enable to relatively easily create a graphic output in a combination of text+graphics.
Various versions of displays feature various inner memory sized depending on a display size, sufficient for placing of many pictures and macros. The newest member of the eDIP/eDIPTFT family is the type eDIPTFT5.7 (640x480px). Natural helpers of development are evaluation boards, which we also keep in stock.
The fastest overview about various versions will provide you an attached table, eDIP and eDIPTFT flyer, as well as datasheets at particular types beneath the article. Several types are also available with a touch panel – their ordering code contains an “ATP” suffix.
eDIP and eDIPTFT displays speak many languages - [Link]
Arduino UNO R3 mini laser cutter:
A few years ago I saw an Instructable where Groover had used a pair of DVD-RW drives to make a pocket laser engraver. Inspired by the idea, driven by the recent purchase of a full-sized 50 watt CO2 laser cutter, and roused by the launch of the Microcontroller contest I took the decision to have a crack at making my own mini laser engraver.
The MicroSlice – A tiny Arduino laser cutter - [Link]
Xose Perez of Tinkerman has written an article detailing the build of his weather station:
Arduino FIO based weather station with a DHT22 temperature & humidity sensor and a BMP085 barometric pressure sensor. The whole sensor will be powered by a solar panel (doubling as irradiance sensor) and backed by a LiPo cell.
Weather station - [Link]
In 2011 Prof. Harald Haas (pictured) of the University of Edinburgh demonstrated streaming a hi-def video signal using a light beam as a transmission medium. He went on to explain how this technology might be used to address the growing paucity of free RF bandwidth and suggested that domestic LED lamps may in future provide an internet access point, once the necessary control electronics to modulate the light are integrated into the lamp.
The key to this technique (dubbed LiFi) is a modified type of Orthogonal Frequency Division Multiplexing called SIM OFDM. This splits the serial data stream into thousands of parallel streams, using multiple carrier frequencies to modulate the light source and achieve a high throughput. [via]
LiFi Ready to Go - [Link]
Kerry Wong built a DIY constant current/constant power electronic load. It can sink more than 200W of power:
A while back I built a simple constant current electronic load using an aluminum HDD cooler case as the heatsink. While it was sufficient for a few amps’ load under low voltages, it could not handle load much higher than a few dozen watts at least not for a prolonged period of time. So this time around, I decided to build a much beefier electronic load so it could be used in more demanding situations.
One of the features a lot of commercial electronic loads has in common is the ability to sink constant power. Constant power would come in handy when measuring battery capacities (Wh) or testing power supplies for instance. To accommodate this, I decided to use an Arduino (ATmega328p) microcontroller.
Building a constant current/constant power electronic load - [Link]
Over 60 years of experiences of German company EBM-PAPST in the fans development reflects in an uncompromising quality of products.
It may sound like a phrase, but to rely on a quality is almost always worth – mainly because of overall savings. Long lifetime and energy efficiency will at the end of the day reflect into lower operation expenses. Quality materials sophisticated construction, precise bearings and results from long-term tests say in favor of EBM-Papst fans. EBM-PAPST has in its testing laboratories 1500 operating fans and there can be even found fans continuously operating from 80´s (!). EBM-Papst is quite stringent regarding a declared lifetime and in comparison to other producers it declares „less optimistic” values, as illustrated on an enclosed picture. It means, that if we compare 2 fans from various producers with similar features, it´s very probable that the type from EBM-Papst will have a higher real lifetime. In the EBM-Papst portfolio can be found practically all types of fans and blowers, from smallest to massive industrial ones, axial, radial (centrifugal), diagonal a tangential. The most of fans is also available in a version resistant to dust and water with IP54. EBM-Papst is a pioneer in the development of energetically efficient fans with a significantly lower power consumption and a quieter operation, for example the ACmaxx and GreenTech_EC series.
EBM-Papst portfolio is very wide, that´s why we keep in stock only a few most wanted types and any other type we´re able to provide you upon request. To the standard stock items we newly added also the type 7056ES – AC fan with of a 150mm diameter. 7056ES is a well proven powerful type with a ball bearing and an all-metal construction. Precise ball bearings SINTEC feature a constant low noise during all the lifetime and a low sensitivity to impacts. 27W motor contains an external capacitor and a thermal fuse against overload. High air flow – 330m3/hr, i.e. over 90 litres per second make this type a universal choice for ventilation of various spaces or cooling of electronics and similar.
Fans able to operate continuously for 30 years - [Link]