arduinomaster @ instructables.com has build an EMF detector based on ATtiny85 mcu able to detect signals from 0-999Hz. He writes:
An EMF meter can measure AC electromagnetic fields, which are usually emitted from manmade sources such as electrical wiring, while gaussmeters or magnetometers measure DC fields, which occur naturally in Earth’s geomagnetic field and are emitted from other sources where direct current is present.
ATtiny 85 EMF detector – [Link]
“jjpfin” @ instructables.com build a Raspberry Pi based temperature and humidity datalogger using DHT22 sensor. Data is stored on mySQL server and can be viewed on browser.
This is an Raspberry Pi based temperature and humidity logger that uses 2 (works also with 1) Adafruit DHT22 sensors for measurements. You might have seen similar kind of instructions before, but this one has a twist. It doesn’t just read temperature and humidity from sensors, but it stores data to MySql database and provides means to read that temperature data with any web enabled device (computer, phone, tablet) web browser.
Raspberry PI and DHT22 Temperature and Humidity logger – [Link]
OpenCVMeter is an open source tool to measure capacitance and leakage current as a function of a capacitor’s working voltage.
When designing circuits, many hobbyists take capacitors for granted – but each type (ceramic multi-layer, aluminum electrolytic, tantalum, mica…) has its own unique properties. Nowadays, ceramic capacitors are the most commonly used capacitors in the industry, but many can lose up to 80% of their rated capacitance near their voltage ratings.
Enter the OpenCVMeter! This meter aims to provide a Capacitance versus Voltage characterization accurate within 1% of the capacitors for your next project (or already have and are starting to wonder about right now…)
OpenCVMeter – Rediscover Your Capacitors – [Link]
Matt Richardson announced that Processing programming language is now supported by Rasbberry Pi. He writes:
I’m a long-time fan of Processing, a free open source programming language and development environment focused on teaching coding in the context of visual arts. It’s why I’m so excited that the latest version, Processing 3.0.1, now officially supports Raspberry Pi. Just as Sonic Pi lets you make your first sound in just one line of code, Processing lets you draw on screen with just one line of code. It’s that easy to get started. But don’t let that fool you, it’s a very powerful and flexible language and development environment.
Processing for Raspberry Pi – [Link]
Enjoy high-end sound quality for all your music with this small and modern digital amplifier.
The ARC was made to bridge the gap between high-end sound quality and the world of digital music. Designed as the perfect receiver and amplifier, this ultra-compact unit provides high-resolution USB audio streaming capabilities, high quality aptX Bluetooth audio and astonishingly detailed sound. For a great listening experience and immersive sound, all you need is a set of speakers and the ARC. Done.
ARC Digital Amplifier – [Link]
jckelley @ instructables.com has build a tooth brushing help tool using LinkIT ONE Board and an LCD screen:
Kids just aren’t huge fans of brushing their teeth. Not only are they not huge fans, they also are pretty bad at it. Teaching a young kid to brush their teeth is really hard. I created a little contraption that not only times them to make sure they brush for an entire two minutes, but also tells them what part of their mouth they should be brushing! Now kids can’t claim they didn’t know what to do, since the Toothbrush Instructor told them!
Toothbrushing Instructor – [Link]
Andy Brown designed a development board for the STM32F042 in the TSSOP20 package:
This project came about because I’m using the STM32F042F6P6 (32Kb flash, 6Kb SRAM) in another project where I’m creating a USB device and the first thing I did is try to obtain a development board for it. I was hopeful that ST would have created one of their ‘discovery’ boards but no, there was only a ‘nucleo’ board available and that had one of the QFP packages on it.
A development board for the STM32F042 – [Link]
This tutorial guides you on how to install Apache server, MySQL and PHP in Raspberry Pi and then hosts a WordPress site on this. raspberrypituts.com writes:
This tutorial is using the Raspian Wheezy OS, Jesse has a similar installation but will not be the exact same. This is an easy tutorial on how to create a WordPress Site on Raspberry Pi. Comments? Questions? Post below!
Create a WordPress Site on Raspberry Pi – [Link]
dangerousprototypes.com has launched a new search feature that is able to search GitHub for specific parts and enables you to easily find reference designs for your next projects. This new search feature can also display Schematics and PCB previews without having to open a CAD software on your local machine, but some limitations exists. They write:
TomKeddie first mentioned this idea at Hacker Camp Shenzhen, and later in the forum and on WeChat. Tom generously shared his scraping/search method. Eagle 6+ files are XML, so we can find them on Github by searching for the “eagle SYSTEM” tag in files with “extension:sch”. That gives more than the maximum 100 pages of results, so we filter by file size and increment size 500 bytes at a time “size:1001…1500″. We use the normal user search interface, parse the HTML results, and grab all urls ending with .sch. While Github has an API, that API doesn’t give access to search code search without specifying a repository by name (probably so people don’t do what we did…).
Search Github projects by component – find design references – [Link]
by AdrieSentosa @ instructables.com:
In this project, we will be making a weather station that measures air pressure, temperature, rain drop, soil humidity and air humidity using Arduino which save the data for data acquisition!
Arduino Weather Station (AWS) – [Link]
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