All items tagged with Elektor.LABS (490)

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Build a very cheap remote control for Volumio on Raspberry Pi

May 21, 2019 by Clemens Valens

Build a very cheap remote control for Volumio on Raspberry Pi

Volumio is a popular audio player app that runs on multiple platforms, and the Raspberry Pi is one of them. This project lets you add remote control to your player in a cheap way by using low-cost 433 MHz transmitter and receiver modules that are easily found online. Besides being suitable for Volumio, you can add the remote also for other applications.

Build a Wearable Vibration Monitor

May 14, 2019 by Clemens Valens

Build a Wearable Vibration Monitor

Long-term exposition of your body, or parts of it, to vibrations may result in injury. But how do you measure the risk? This project might help here. Although originally designed for measuring vibrations caused by hand-held power tools like drills and grinders in the user’s hand and arm, there are probably many other fields of application for it. All you need to do is place the sensor in the right spot.

Build a PIR Sensor That Can Send Email

May 7, 2019 by Clemens Valens

Build a PIR Sensor That Can Send Email

Cheap, powerful and equipped with Bluetooth and Wi-Fi, the ESP32 has quickly become a popular development platform for homegrown IoT applications. Here is one that transforms an ordinary PIR sensor into an almost intelligent, communicating entity. This alarm may be less suited for people who check their email only once a month.

Build a Pin-Diode Based Radiation Detector as an MQTT Client

April 30, 2019 by Clemens Valens

Build a Pin-Diode Based Radiation Detector as an MQTT Client

More than 30 years after the accident that destroyed the nuclear powerplant in Chernobyl (Ukraine), the radiation it created still has measurable consequences in regions hundreds of kilometres away. This project came to life when Sweden launched a nationwide project in 2018 to analyse dried mushrooms to determine the accumulated radiation level in the soil.

DIY Spot Welding For Battery Packs

April 23, 2019 by Clemens Valens

DIY Spot Welding For Battery Packs

It appears that Europe is way, way behind China when it comes to the production of batteries. Billions will have to be invested to keep up. Although this week’s Elektor Labs project is a drop in the battery builders' ocean, it may be highly useful for those who don’t want to wait for investors and decision makers.

Add a User Interface with Presets to Your Power Supply

April 16, 2019 by Clemens Valens

Add a User Interface with Presets to Your Power Supply

A few years ago, Elektor published a 30-V, 3-A adjustable benchtop power supply dubbed UniLab2. To keep the total outlay down, it had a rather basic user interface. The Elektor Labs project highlighted this week offers a slick user interface for the UniLab2 by adding rotary encoders and a 4-line LCD. On top of that, you get handy presets for 3.3-V, 5-V and 12-V output voltages.

Build a Theremin with Tubes Like Leon Did a Century Ago

April 9, 2019 by Clemens Valens

Build a Theremin with Tubes Like Leon Did a Century Ago

When Leon Theremin built his now famous musical instrument, he only had valves at his disposition. Today we have the choice between analog and digital techniques, and between BJTs, FETs, and valves. We can even combine them all. This special 99th-anniversary version Theremin design only uses valves.

Build a Robust Continuity Tester with Adjustable Threshold

April 2, 2019 by Clemens Valens

Build a Robust Continuity Tester with Adjustable Threshold

Where many homegrown continuity testers are limited to a battery and a buzzer or maybe just an LED, this design uses a Wheatstone bridge instead. The advantage is that you can adjust the detection threshold from 1 Ω up to 20 Ω. But this design doesn’t stop there, it even allows for lead resistance compensation and it is protected against people who forget to switch off the power of the DUT.

Best of the BAY-ern [7]

March 27, 2019 by Udo Bormann

Best of the BAY-ern [7]

Best of the BAY-ern [7]: BMW & Daimler cooperate to combine the strengths of BAY-ern and the BAY-area, FabLab Nuremberg moved to Fürth and opens up the gates, what are the next events, meet-ups and more? Findthe answer here....

Build a wide input, wide output switched power supply preregulator

March 26, 2019 by Clemens Valens

Build a wide input, wide output switched power supply preregulator

Benchtop power supplies with power transformers are heavy and expensive, especially when designed to supply a few hundred watts. Furthermore, such designs are old school. Today, using switch-mode configurations it is possible to design 250-watt PSUs running from anything from 85 up to 265 VAC line voltage, yet weigh less than 500 grams. The design showcased here is even open source.

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