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Improve your Photodiode-Based Radiation Meter

July 16, 2019 by Clemens Valens

Improve your Photodiode-Based Radiation Meter

In the ever-changing world of electronics, not many applications remain valid after eight years, but there are exceptions. One of them is the photodiode-based radiation meter we published at the end of 2011. Because the original design has suffered slightly from component obsolescence, we decided to refresh it a bit and replace the BF245 by a BF256B. We also did some other useful modifications.

July 16, 2019 by Chantalle Reuling

Compete to launch your startup @ productronica 2019!

GET STARTED Sign up online and provide detailed information (in English) about your startup and product or solutions. Describe your startup, technology and product(s). The idea is to clearly explain your company, technology, and product(s).

Handcraft Your Own Sunlight-Rejecting Optical Switch

July 9, 2019 by Clemens Valens

Handcraft Your Own Sunlight-Rejecting Optical Switch

Light beams are useful for sensing in all kinds of applications if other light sources, often sunlight, don’t interfere. Modulating the beam as do for instance infrared remote controls is a good way to make the signal stand out against ambient light, and ICs to handle this for you are easily found. But what if you need more control? Well, then you DIY.

Control an AC Load with a Microcontroller, Arduino or Raspberry Pi

July 2, 2019 by Clemens Valens

Control an AC Load with a Microcontroller, Arduino or Raspberry Pi

Playing with the mains voltage can be deadly, so proper isolation techniques and safe working practices are very important. Besides emphasizing these lifesaving things, this article also explains in detail how to apply them when building an AC load controller or light dimmer with a well-designed PCB. The device itself can be connected to a microcontroller, but also to an Arduino or a Raspberry Pi board.

Connect your Doorbell to the Internet

June 24, 2019 by Clemens Valens

Connect your Doorbell to the Internet

Wireless doorbells have been around for many years, but they have limited range. Besides more pleasing sounds than a loud DRRRING from a wired bell they do not really offer much more. Connecting a doorbell to your Wi-Fi network makes things way more interesting. Now suddenly the old button can send email when someone is at the door and you can “hear” it almost anywhere on the globe.

Shoo Cat!

June 18, 2019 by Clemens Valens

Shoo Cat!

This is one of those projects that many people dream of building, but few actually do all the way. Admit it, you too have thought at least once about automated curtain openers in your bedroom, yet I have only once met a guy who had really done it. This system spouts water at cats to chase them away. I’m gonna build me one of these too, but against pigeons.

Build a Dual H-bridge PWM Controlled DC Motor Driver

June 11, 2019 by Clemens Valens

Build a Dual H-bridge PWM Controlled DC Motor Driver

Useful circuits can be as simple as a paper clip. Here is such a circuit. It can be so simple because all the complicated and hard stuff has all been integrated into a single IC by a clever semiconductor manufacturer. Plunk the chip on a little printed circuit board, add connectors, and you're in business. Motor driving business in this case. Hook it up to a DC motor and let her rip.

Build an Electric Charge Detector With Only Three Components

June 4, 2019 by Clemens Valens

Build an Electric Charge Detector With Only Three Components

This electric charge detector can be built from only three components: a diode, a J-FET and an LED. Well, to be completely honest, you need five because a sensor and a 9-volt battery are also required to make the thing work (not counting the battery clips and other bits of connecting wire). You can use it to discover electrically charged objects near you. It will run for many months on one battery (but can it detect if the said battery is charged?)

Build a Random-Number Generator with Isolated USB Interface

May 28, 2019 by Clemens Valens

Build a Random-Number Generator with Isolated USB Interface

Some people go to great lengths to generate numbers that are as random as possible. In issue 3 of 2017, we published a design for a Truly Random-Number Generator by Luca Matic that used an SD card to store the produced random data. This variation of the project replaces the SD card by an optically isolated USB interface. Now data can be stored directly on a computer while an application written in C# provides easy fine-tuning of the generator's analogue filters.

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.

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