A Spark.io Indoor Ambient Quality Monitor


Davide Gironi has build an indoor ambient quality monitor based on particle.io :

SXAM (Spark to Xively AMbient quality monitor), is an ambient quality monitor that logs 4 environmental parameters to the xively.com and display the ambient status by using for RGB leds.

SXAM logs: Humidity, Temperature, Ambient noise, Brightness, Note: Spark.io is now Particle.io.

A Spark.io Indoor Ambient Quality Monitor – [Link]

LimiFrog – Ultra-compact prototyping. For IoT and much more.


Program it to invent smart objects. For IoT, robots, wearables, your bright ideas. With sensors, strong MCU, bluetooth, oled & more.

LimiFrog — Ultra-compact prototyping. For IoT and much more. – [Link]

OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator


by loboat @ instructables.com:

Oscilloscopes and Signal Generators are two essential electronics devices to create and test electronic circuits. Unfortunately, these devices are very expensives for students starting electronics, or makers who want use electronic circuits in their creations just once…

The idea of my project is to rethink your smartphone as a portable, powerful and secured platform, able to simulate an oscilloscope and a signal generator for your electronic circuits.
Here, your phone isn’t just an accessorize or an ordinairy remote control : it becomes the center of the project, and a tool to help you create better things in the future.

OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator – [Link]

How to Make Two ESP8266 Talk


Rui Santos shows us how to make two ESP8266 to talk:

In this project you’re going to make two ESP8266 talk with each other.

How it works? You’re going to set one ESP as an Access Point (Server) and another ESP as a Station (Client). Then they’ll establish a wireless communication and the Client sends a message to the Server saying “Hello World!”.

How to Make Two ESP8266 Talk – [Link]

Contactless payment ring – A tutorial on NFC antenna coil design

Jatinder has tipped us with this latest post. He writes:

 I have a done a video about a contactless payment (NFC) ring that I have made. The video talks about NFC antenna coil design and how I used the concepts to make the wearable ring.

Contactless payment ring – A tutorial on NFC antenna coil design – [Link]

Dekatron as Internet speed indicator


spritesmods.com has build a interner speed indicator based on a Dekatron tube, the result is great.

As most electronic engineers and hobbyists do, I have a great respect for the earlier ways of controlling electrons, before it was found out that silicon could be used to miniaturize everything a thousandfold. It is amazing that things like a vacuum, a glow wire and a bunch of strange-looking metal bits can actually do useful stuff. The amazing-ness of it all gets even better if there are visuals involved: while vacuum tubes only have the faint glow of the heater, tubes filled with neon are more interesting because they can be used to display stuff. Nixie tubes are a prime example of those.

Dekatron as Internet speed indicator – [Link]

DIY Apple Clock


by TSJWang @ instructables.com:

OK so there’s no such thing as the Apple Clock.
However, you can make your own retro-style bubble display clock in an Apple earbuds case.

I’m going to show you how to do that just sit tight.

DIY Apple Clock – [Link]

650V, 100A GaN transistors on show


by Graham Prophet @ edn-europe.com:

GaN Systems (Ottawa, Canada) is to display its GS66540C 650V 100A high current GaN power transistors for the first time at the 17th Conference on Power Electronics and Applications, EPE’15 – ECCE Europe (CERN, Geneva, September 8th – 10th )

The GS66540C (the picture is of a prior, lower-current part) high current power devices will be revealed for the first time. Part of the company’s family of 650V gallium nitride power transistors based on its proprietary Island Technology, these high density devices achieve extremely efficient power conversion with fast switching rates of >100V/nsec and ultra-low thermal losses. The GS66540C is supplied in an evolved form of GaNPX packaging specially developed for higher operating currents, providing lower inductance and greater surface mount mechanical robustness required by power modules for the industrial and automotive markets. The near-chipscale parts have no wirebonds and offer step-change improvements in switching and conduction performance over traditional silicon MOSFETs and IGBTs. Parts are, the company says, being designed in to solar, industrial and automotive applications as global manufacturers race to use the power of GaN to secure competitive advantage.

650V, 100A GaN transistors on show – [Link]

Würth Elektronik – a huge range of inductive components


Würth Elektronik is one of the largest European manufacturers of passive and electromechanical components. The range is really wide, judge for yourself.

Let us mention at least two types from a wide range:

  • WE-PD – is a popular “standard” series of SMD inductors. Also available with white coating in the sizes 7332 (7,3×7,3×3,2mm), 7345, 1260 and 1280 for use in applications with LED.
  • WE-HCI – series is designed for high current switching regulators. Standard operating temperature range is -40 °C to +125°C, for some types up to +155°C. The inductors are wound by a flat wire.
    This allows optimal use of space inside the core and thus achieves extremely low DC resistance of the winding while reducing winding losses caused by the skin effect.
    As an example 744355122 type features saturation current 65A, winding DC resistance 0,35mOhm and operating temperature range -40 °C to +155°C.

In addition to the power coils we have included to our portfolio also RF inductors, dual coil power inductors, common mode chokes, ferrite beads, ferrites for cable assembly, transformers for SMPS and coils for wireless power chargers.

We have extended our offer of power coils by 23 SMD series and 4 TH series. Series

  • SMD, non-shielded – WE-PD4, WE-PD2, WE-LQ, WE-LQS, WE-PD2A, WE-PD2 HV
  • TH, shielded – WE-TIS
  • TH, non-shielded – WE-TI, WE-SI, WE-TI HV

Würth Elektronik – a huge range of inductive components – [Link]

4×1 WiFi Wireless Antenna Switch


Horacio Bouzas published a 4 way WiFi antenna switch:

I started playing with electronics back when I was 10 years old in Argentina, where I grew up. Then I got my ham radio operator license when I was 16 years old and I was very active in the ham club and on the air. It was then when I built my first vacuum tube transmitter and refurbished and old receiver (also vacuum tubes) that somebody from the club was throwing away. My interest for science and electronics grew and I ended studying physics but always tinkered with electronics, whenever I could.

I’ve moved a lot around the world for work (oil and gas) so my dedication to ham radio pretty much faded away. But it came back! Just recently, I got my ham radio operator license back and started to get active on 2mtr and on digital.

Due to lack of space outdoors, I had to settle for installing my center fed dipole on the attic (I have a long attic), but I quickly realized I needed more than 1 antenna. 80 mtr, 40 mtr, 20mtr….

And I didn’t want to run multiple lines to the attic, so an antenna switch was necessary.

4×1 WiFi Wireless Antenna Switch – [Link]