Teardown of a Piezoelectric vibrating gyroscope

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Kerry Wong did a teardown of an old analog piezoelectric vibrating gyroscope:

Gyroscopes nowadays are based on micro-electro-mechanical systems (MEMS) technology. They are low cost and extremely miniaturized. A device combing both a three-axis gyroscope and a three-axis accelerometers (sometimes these devices are referred to as 6DOF devices) such as the MPU-6500 for example can be had in a QFN package as small as 3 mm x 3 mm and under 1 mm in height. Before these MEMS devices gained mainstream popularity however, larger piezoelectric vibrating gyroscopes were used in many consumer electronics devices.

See the full post on his blog.

Check out the video after the break.

Solar powered weather station

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Antalife has written an article detailing the build of his a solar powered weather station:

To expand my microcontroller and programming knowledge I have decided to try and make a Solar Powered Weather Station. My goal is to record parameters like:
*Temperature
*Humidity
*Air pressure
*Air quality (something to do with CO or CO2)
I then hope to send (wirelessly) the data to a base station and log/display it on a simple website. To make things interesting I also aim to power the data gathering station from a large supercapacitor (~100F), and in keeping with my solar tradition the supercapacitor will be charged from a solar-cell.

See the full post on his blog.

App note: Understanding the characteristics of Li-ion batteries and Richtek power management solutions

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App note from Richtek on how to work with Li-ion batteries properly. Link here

Lithium-ion/polymer rechargeable batteries, which have been widely used today, have distinguished properties, but are very delicate and have to be used with extreme care. Improper use of Li-ion batteries will bring about catastrophic consequences. The incidences of burning and explosions of Li-ion batteries have often been heard. Carefully understanding their properties and adopting a right battery management method is most essential for making good use of Li-ion batteries.

Irrighino and Yun Rev.2

Irrighino has been one of my most appreciated projects: it’s a automatic irrigation system – based on Arduino Yun – with a web-based interface, optimized for smartphones.

After having published the project on this blog, it was reviewed by Open Electronics and a dedicated shield was also produced. The shield is still sold on Futurashop:

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When it was launched the new Arduino Yun (named Rev.2) and the Yun Shield, the Linux distribution running on the board, OpenWrt, was updated as well. In particular, a key component for Irrighino has been replaced with its newer version, the php engine.

If you own a “first generation” Arduino Yun and you’d like to test the new functionalities shipped with Rev.2, in this post I explain how you can update the operating system of your board!

The commands you have to issue on your Yun to install all the required components for Irrighino now are:

install php with cgi and cli

opkg install php7 php7-cgi php7-cli

install curl, json and sqlite modules

opkg install php7-mod-curl php7-mod-json php7-mod-pdo php7-mod-pdo-sqlite

install zoneinfo

opkg install zoneinfo-core zoneinfo-europe

(replace zoneinfo-europe with the one related to your continent)

Final step is to configure the uhttpd webserver to run the php engine.

Edit the /etc/config/uhttpd file adding the following line (pay attention to its position!):

irrighino-php-002

then restart the webserver with:

irrighino-php-003

Now the Yun is ready to run Irrighino!

Simple I2S stereo decoder with amplifier

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Dilshan Jayakody published a new build:

In this project we build simple I2S stereo decoder with amplifier. To decode I2S data we use Princeton Technologies PT8211 16bit DAC. KA2206 audio power amplifier is used as driver stage of this system.
Structure of this I2S amplifier is self-explanatory from the schematic. We select PT8211 and KA2206 combination due to lower cost and availability. Unfortunately PT8211 DIP package is not available in local market and we use SO package in our prototype. We design PCB for the DIP packages, and therefore we solder PT8211 SO package to PCB using “SO8 to DIP8” converter.

See the full post on his blog.

A transmit converter (and amplifier) for 630 and 2200 meters

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KA7OEI has a great write-up on building a transmit converter for 630 and 2200 meters:

As the name implies, a transmit converter takes another frequency – such as that produced by a conventional HF transceiver – and converts it to another frequency.  In my case I use an FT-817 – a low-power (5 watt) all-mode, all-band transceiver that is a favorite for VHF, UHF and microwave enthusiasts that use transverters.  Because of its small size, feature set and already-low output power, it is a natural to be used in this application.

See the full post on his blog.

Pro mini logger project for the classroom

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Edward Mallon writes:

Dr. Beddow’s instrumentation class has been building the 2016 version of the Cave Pearl datalogger for more than three years, and feedback from that experience motivated a redesign to accommodate a wider range of student projects while staying within the time constraints of a typical lab-time schedule. The rugged PVC housing from the older build has been replaced with an inexpensive pre-made box more suitable for “light duty” classroom deployment. The tutorial includes a full set of youTube videos to explain the assembly. We hope this simplified build supports other STEM educators who want to add Arduino-based experiments to their own portfolio of activities that develop programming and “maker” skills.

Via the comments.  More details on Underwater Arduino Data Loggers blog.

Solar powered WiFi weather station

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A detailed instructions of how to build this weather station project by Open Green Energy:

This Instructable is a continuation to my earlier weather station project. It was quite popular on the web, people around the globe made their own by following it and given valuable feedbacks for improvement.By taking consideration in to the comments and Q&A section of my earlier project, I decided to make this new version Weather Station.I also made a custom PCB for this project, so any one with little knowledge on electronics circuit can be made this project. My V-2.0 PCB can also be used for many application in Arduino platform. Following are the salient features of new weather station

Project instructables here.