When you have multiple LEDs with a common anode or common cathode, can you use just one current-limiting resistor? Let’s take a look.

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Custom built arcade and mame cabinets. Mini Arcade. Roms, emulators. Porta-Pi, Porta Pi Arcade. DIY video game. Hack, mod. build your own arcade

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“The great thing about standards is that there are so many to choose from.” Truer words were never spoken, and this goes double for the hobbyist world of hardware hacking. It seems that every module

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Use a wind sensor and an Arduino to blow out an LED candle.

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This article uses examples to explain the technique of source transformation.

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Okay, we haven’t even hit Halloween yet, but if you’re planning some kind of holiday project, now’s a good time to start ordering your parts, especially if you’re designing your own PCB. Whil

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Two years ago, I started playing around with cheap 433MHz plugs that can be found almost everywhere. At that time, I got several from different brands, from the well known Chacon

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I have used any number of different methods of animation when building model railroads including movement, sound and light. I have not, however, used smoke… that is until now. The fairly recent advent of smokeless cigarettes, also called e-cigarettes, e-cigs or vapor cigarettes, has provided an opportunity for us to make small, inexpensive and quite impressive smoke machines. I have been doing some experiments and have come up with a fairly simple method to create a good bit of smoke that can be turned on or off at will. The smoke maker shown here is appropriate for creating smoking pumpkins on Halloween, getting a chimney to smoke on a Christmas diorama or to provide realistic smoke stack smoke from a factory on a model railroad. It could also be used to have smoke emanate from a burning building, car or airplane crash or a campfire. To turn an e-cigarette int

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