Julian Ilett demonstrates his Arduino Solar Charge Controller. He has mounted all of his Arduino modules to a piece of wood to keep everything nice and neat. [via]
“High efficiency values (96% – 97%) are achievable when the buck converter is stepping down from 18v to 12v. With a 72-cell panel and the converter stepping 35v down to 12v, the efficiency drops to around 88%.”
Arduino Solar Charge Controller - [Link]
Glyn Hudson over at OpenEnergyMonitor has developed this remote temperature and humidity monitoring node, the emonTH:
The emonTH supports both the DHT22 (humidity and temperature) and DS18B20 either onboard or remote temperature sensor. The default software will search for the presence of either sensor at startup. If both sensors are found it will return humidity from the DHT22 and temperature from the DS128B20. If only the DHT22 is found it will return both humidity and temperature readings from this sensor, finally if only the DS18B20 is found only temperature readings will be returned. In the future I would to expand the code to support multiple DS18B20 sensors on the one-wire bus.
emonTH – Wireless temperature and humidity monitoring node - [Link]
A multifunction WiFi Shield that will boost your Arduino systems.
Have you ever wanted to include WiFi functionality into your Arduino system but been scared away by the shear cost and complexity of it. Not to mention that you normally want to have a few other things in there such as maybe an SD card to be able to give those web pages some flare, a real time clock maybe and what about some non volatile SRAM memory to store all that real time sensor data that you have to take good care of.
Arduino compatible WiFi Shield with multiple functions - [Link]
Get a professionally manufactured PCB for your design completely FREE!
We are happy to announce our new PCB giveaway program for the OSHW community. We will professionally manufacture 5 pieces of your PCB design and ship them to you worldwide completely free. We just ask to publish your Open Source design on Electronics-Lab.com projects section (under your name) and you will get your PCBs for free in 15-25 days (depending on destination). All designs submitted will be manually reviewed and if applicable will be processed for manufacturing.
The process is simple:
- Submit your design on the email below (Cadsoft EAGLE files in ZIP are preferred)
- We review your design based on how well it’s designed, how useful it is for the OSHW community
- You get notified by email if your design is accepted or not
- We process your design for manufacturing
- We publish your project here on Electronics-Lab.com
- You receive your PCB copies in 15-25 days
Some rules apply:
- You must be the project owner (your project will be published with your name)
- Your PCB can be 1 or 2 layers (max dimensions 10x15cm)
- Your PCB design should meet manufacture specifications (we will let you know if your board meets specs)
- You will get 5 boards for free + free worldwide shipping
- Your design should be clean and pass most of ERC and DRC rules (electrical/design rule check)
- All projects submitted should have at least: Schematic, PCB design, description / diagrams, code if available (photos are welcome)
- CadSoft Eagle is the preferred CAD software to design your PCB (exported Gerber files from other software will be accepted)
Submit your projects NOW on webmaster @ electronics-lab.com (subject: Get your PCB for Free). You will get notified if your PCB meets minimum design specifications to participate on PCB giveaway program.
Feel free to ask any questions below.
Happy PCB designing!
UPDATES – Projects approved so far:
- Open Source 3.2″ TFT Smart Display
- FM Transmitter MAX4467 & MAX2606
- DC Motor Driver using L293D
- LED Binary Clock – Arduino Shield Compatible
- 24×6 LED Matrix Control Circuit
- Automatic School Bell
- BO.Duino – ATmega328 Arduino board
- FM VCO Transmitter
- Low Frequency Spectrum Analyzer
- MAX2606 – Hands-Free Car Kit for Cell Phones
- Simple SMD LED tester
- miniLOG – Precision Standalone Voltage Logger
- MCU Controlled Spot Welder
- AMP – Arachnoid Mobile Platform
- Temperature Controlled PC FAN
- Variable Power Supply with LM7812
Jimb0 @ sparkfun.com writes:
I got my first taste of programming with RCX Code and an old Mindstorms RCX 1.0, so maybe it’s nostalgia speaking, but I really admire visual programming languages for their ability to introduce younger folks to programming. With color coded operators, geometrically shaped data types, and no semicolons (!), visual languages have a unique ability to make programming a more intuitive experience. And with the (admittedly necessary) annoyances of syntax removed, more of your programming focus can be directed towards solving the actual problem.
Enginursday: Visually Programming Arduino - [Link]
by Publitek European Editors:
Power MOSFETs have become very popular in power electronics designs because of their low capacitance and good high-frequency switching characteristics. They have reached into many applications and are helping to open up new markets in applications, from hybrid and electric vehicles through solar power to extreme-environment exploration. The unifying factor of these environments is heat. Automotive engines and solar panels can generate heat that pushes junction temperatures in power devices far higher than 100°C. Such heat can badly affect power semiconductors that are not designed to cope. Power semiconductors all have temperature limitations. Leakage current increases with temperature and this can accelerate effects that lead to breakdown conditions that can damage circuitry and cause other hazards.
MOSFETs that Can Take the Heat - [Link]
New 6W DC/DC module series TEN5 won´t be scared neither of a very fluctuating input voltage, that´s why it´s ideal even for battery-operated applications.
Series TEN5 is a well proven reliable series of insulating DC/DC modules with a fixed output voltage, in case of TEN5-2411WI it is 5V. TEN5 series is available in so to say “basic” version with a 2:1 input voltage range and also in this „WI – wide input“ version, with a 4:1 ratio. In the most of cases, it´s probably possible to choose an appropriate type, for example TEN5-1211 with an input voltage of 9-18V, which is for example ideal for 12V applications with Pb accumulators (SLA). However namely for the mobile applications it can be beneficial, if a given device could be powered also by for example 24V, used in cargo trucks.
TEN5-2411WI with an input voltage of 9-36V and 5V/1A output is suitable this new type from our stock offer. Besides mentioned wide range of input voltages it also features a good efficiency (79% typ.) and excellent regulation at a change of input and/or load. Enhanced operating temperatures range (-40 to +85°C) and resistance to a continuous shortcut make it suitable even for demanding applications. Also useful is the built-in filter to meet EN55022 Class A and FCC level A. Metal shielded package in a standard DIP-24 package with an insulated base plate simplifies PCB design and also assembly to a PCB. In the TEN5 series can be found 2 versions: with input voltages of 9-36V or 18-75VDC with various output voltages, including symmetrical ones.
Detailed information can be found in the TEN5-WI datasheet.
TEN5-2411WI – don´t be limited by an input voltage - [Link]
This is a DC-DC step-up converter based on LM2585-ADJ regulator manufactured by Texas Instruments. This IC was choosen for it’s simplicity of use, requiring minimal external components and for it’s ability to control the output voltage by defining the feedback resistors (R1,R2). NPN switching/power transistor is intergrated inside the regulator and is able to withstand 3A maximum current and 65V maximum voltage. Switching frequency is defined by internal oscillator and it’s fixed at 100KHz.
LM2585 12V to 24V @ 1A Step-up switching regulator - [Link]
Inrush current, effective power, power factor, harmonic distortion, … all these and other parameters handles CM8 with easiness.
Clamp multimeters are often used mainly thanks to their ability to measure AC (and even DC) current even without a disconnection of a wire. But it´s only one basic feature, which more sophisticated devices can use even for another purposes, like comfortable measuring of power and power factor. Benning CM8 is a device able to provide detailed information regarding power conditions in a measured circuit and measure much more than usual clamp meters, for example:
● measuring of inrush current
● measuring of effective power in 4 ranges – 4/40/400/600 kW + calculation of a power factor in a full range -1,00…0…+1,00
● VAC true RMS in a frequency range of 45-500Hz, high accuracy up to a crest factor of 3
● harmonic distortion with 0,1% resolution and sensitivity up to 25-th harmonic (ACV, ACA)
● measuring of DC current up to 600A (0.1A resolution)
It can be said, that Benning CM8 is a device, with which it´s possible to check even large circuits and for example find possible source of defects and similar. Thanks to a measurement of inrush current it´s able to give a real information about a load of a circuit and thus for example to give an information, whether it´s possible to add another device into a given circuit etc.
Detailed information about the CM8 will give you the Benning CM8 user guide and an overview of Benning measuring and testing devices.
Top class multimeter Benning CM8 examines even motors - [Link]
A new, free 3D design tool aims to help engineers with 3D modeling of their designs by being easy to use. RS Components and SpaceClaim joined forces to develop the tool, which can be used to model physical elements of designs, such as enclosures or interface panels, without having to learn complex feature-based 3D tools. It can also be used to develop early prototypes, either as a PDF file or on a 3D printer.
DesignSpark Mechanical aims to overcome the two major entry barriers faced by potential users: the cost and steep learning curve of traditional 3D CAD tools. DesignSpark Mechanical is free, and it uses direct modeling so that engineers and others involved in product development can learn to use the software within minutes. [via]
Free 3D Modeling Tool Facilitates Mechanical Design - [Link]