Everything for Electronics
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The Discovery of Radio Waves

When the concept of electromagnetic waves was first proposed around 1864, it was met with great skepticism. As a result, the idea languished for a long time. It took several decades for a handful of dedicated persons — infatuated with the mysteries of electricity and magnetism — to finally put the theory on a solid footing.

In this article, we’ll take a look back at this period that launched the serious study of radio waves. We’ll examine the contribution of James Clerk Maxwell, the man most responsible for the concept. Next, we’ll look at the work of several notable scientists who came after Maxwell, and see how they confirmed the existence of radio waves.

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DIY Biotech: Harnessing Bacteria for Fermentation

Do-it-yourself biology is a growing biotechnological social movement in which individuals, communities, and small organizations study biology and life science using the same methods as traditional research institutions. In this first installment of a series of DIY Biotech articles, we’ll look at bacterial fermentation in the form of yogurt making. Not only is this a low-cost, low-risk entry into practical DIY biotech, you’ll learn a lot about monitoring pH as well.

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Mass Confusion: The End of the Kilogram as We Know It

This November, in Versailles, France, representatives from 57 countries are expected to make history. They will vote to dramatically transform the international system that underpins global science and trade. This single action will finally realize scientists’ 150 year dream of a measurement system based entirely on fundamental properties of nature. The International System of Units — informally known as the metric system — will change in a way that is more profound than anything since its establishment following the French Revolution.

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Can You Trust Your Voltmeter?

Sometimes I wonder which of my portable digital voltmeters I can trust — the B&K, Fluke, or Amprobe. Usually, they’re pretty close but it bugs me not knowing whether they are right on the nose. Fortunately, these days, there are a number of very accurate voltage reference circuits that you can build or purchase for a few dollars.

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Build a Custom Weather Gauge — Part 2

This fun, elegant, and useful project pulls data from the Internet so a series of useful displays can show all kinds of cool info in real time from your mantel or bookshelf in this impressive platform.

In our previous article, we discussed the circuit and code for each of the core components for our Weather Gauge. We took a deep dive on how the stepper is wired up and the node.js code that drives it. Now, it’s time to put it all together and light it up in this final installment.

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Build a Custom Weather Gauge — Part 1

This fun, elegant, and useful project pulls data from the Internet so a series of useful displays can show all kinds of cool info in real time from your mantel or bookshelf in this impressive platform.

In this first article of a two-part series, we’ll discuss the circuit and code for each of the core components for the weather; take a deep dive on how the stepper is wired up; then learn about the node.js code that drives it.

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Build a Fun Wind Speed Tracker with a Raspberry Pi

I’ve enjoyed tracking wind speed for years with my Davis weather station. However, the tiny plot on the station’s LCD screen is not very resolved and I wanted it to be better ... a whole lot better. The solution: a Raspberry Pi!

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