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Companion note to the WiFi Pineapple Mark V repair. The dead part in that repair turned out to be a Fitipower FR9888 step-down converter — a chip I’d never heard of, on a board with no obvious markings pointing to it. Finding and reading its datasheet is what actually solved the repair, so here’s what…
Companion note to the DVD-burner laser diode extraction project. That project pulls ~100mW diodes out of old DVD burners — well past the point where “just don’t look at it” is an adequate safety plan. Here’s what the class ratings actually mean and why it matters. The IEC 60825-1 classes, briefly Laser products are classified…
Here is my list of various sources for exotic or highly specialized materials: Textiles: tacticaltrim.de // Cordura, various textiles to military standards extremtextil.de // Kevlar fabric, Kevlar thread, Cordura, Nomex, Aramid kanirope.de // Kevlar rope Metals: lenzshop.de // Copper (profiles and plates) tp-maier.de // Bearing bronze as round material, also carries PTFE/Teflon plates schmiedeglut.de //…
Coilgun Basics I had my first experiences with coilguns as a child when I played with an old doorbell, more precisely, with a so-called Bim-Bam gong. This gong consists of a coil with a movable, spring-loaded core and is similar to a solenoid. You can visualize how it works in this video. Of course, I…
In this series I want to show you, how to use the Assembler (ASM) language on your Arduino and AVR. Instead of using plain assembly however, I will show you how to merge it with your C++ Code. Keep in mind, that ASM code is not very portable. This tutorial is only for AVR processors…
A Railgun, also known as a “Schienenkanone” in German, is similar to a Coilgun but relies on entirely different magnetic forces. While in a Coilgun, ferromagnetism is the driving force, the Railgun’s operation is mainly based on the Lorentz force, specifically the Lorentz force acting on a current-carrying conductor. The Lorentz force is determined by…
Sorry, this entry is only available in German.
The HC-SR04 is an ultrasound distance sensor that is very easy to control and is available at an affordable price. The working principle is quite simple: Similar to sonar, the sensor emits a sound pulse that travels from the sensor and may be reflected by an object. The sound travels from the sensor to the…
Often, you want to control an Arduino using a button. Fortunately, connecting a button is straightforward, and the Arduino IDE even provides a pre-made sketch that you can find under Examples -> 02.Digital -> Button. Here is the source code: [code] /* Button Turns on and off a light emitting diode(LED) connected to digital pin…
What’s the deal with Assembler? In short, the difference between Assembler and another high-level language is similar to driving a car yourself (Assembler) versus calling a taxi (high-level language). When you want to drive a car, you need to know how to operate everything and be familiar with traffic rules. Getting from one point…