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Detect Lightning Strikes With Audio Equipment. One of the driving principles of a lot of the projects we see is simplicity.

Detect Lightning Strikes With Audio Equipment

Whether that’s a specific design goal or a result of having limited parts to work with, it often results in projects that are innovative solutions to problems. As far as simplicity goes, however, the latest project from [153armstrong] takes the cake. Radar Sensors Put to the Test. [Andreas Spiess] picked up a few inexpensive radar sensors.

Radar Sensors Put to the Test

He decided to compare the devices and test them and–lucky for us–he collected his results in a video you can see below. The questions he wanted to answer were: The Right Circuit Turns Doppler Module into a Sensor. Can you buy a working radar module for $12?

The Right Circuit Turns Doppler Module into a Sensor

As it turns out, you can. But can you make it output useful information? According to [Mathieu], the answer is also yes, but only if you ignore the datasheet circuit and build this amplification circuit for your dirt cheap Doppler module. Shmoocon 2017: So You Want To Hack RF. Far too much stuff is wireless these days.

Shmoocon 2017: So You Want To Hack RF

Home security systems have dozens of radios for door and window sensors, thermostats aren’t just a wire to the furnace anymore, and we are annoyed when we can’t start our cars from across a parking lot. This is a golden era for anyone who wants to hack RF. This year at Shmoocon, [Marc Newlin] and [Matt Knight] of Bastille Networks gave an overview of how to get into hacking RF. Heavy Lift Electromagnet from Microwave Oven Transformers. It’s OK, you can admit it — from the time you first saw those huge electromagnetic cranes in scrap yards you’ve wanted to have one.

Heavy Lift Electromagnet from Microwave Oven Transformers

While it may not fling around a car, parts donated from scrapped microwaves can let you build your own electromagnetic lifting device and make that dream finally come true. We recently watched [MakeItExtreme] turn a couple of microwave oven transformers into a somewhat ill-advised wall-climbing rig. It looks like that may have been the inspiration for this build, and the finished product appears to be a tad more useful this time.

The frames of three MOTs are cut open to remove the secondary coils and leave the cores exposed as poles for the future magnets. A shallow dish is fabricated out of steel and the magnets are welded in place. With the primaries wired together, the magnets are epoxy potted, the business end is faced off cleanly, and the whole thing put to the test. Pulsed Power and its Applications. Supplying Power to a Rotating Object, Wirelessly! - 3. Cornell Students Have Your Back. Back problems are some of the most common injuries among office workers and other jobs of a white-collar nature.

Cornell Students Have Your Back

These are injuries that develop over a long period of time and are often caused by poor posture or bad ergonomics. Some of the electrical engineering students at Cornell recognized this problem and used their senior design project to address this issue. [Rohit Jha], [Amanda Pustis], and [Erissa Irani] designed and built a posture correcting device that alerts the wearer whenever their spine isn’t in the ideal position. Creating A PCB In Everything: Creating A Custom Part In Fritzing. This is the continuation of a series of posts where I create a schematic and PCB in various EDA tools.

Creating A PCB In Everything: Creating A Custom Part In Fritzing

Already, we’ve looked at Eagle CAD, KiCad, and took a walk down memory lane with one of the first PCB design tools for the IBM PC with Protel Autotrax. One of the more controversial of these tutorials was my post on Fritzing. Fritzing is a terrible tool that you should not use, but before I get to that, I need to back up and explain what this series of posts is all about. The introduction to this series of posts laid it out pretty bare.

Humidity Sensor Shootout. If you want to measure humidity (and temperature, and maybe even barometric pressure) in a device that you’re building, have a look at this comprehensive test of seven different options.

Humidity Sensor Shootout

We’re going to summarize the results here, but you’ll really want to read up on the testing methodology — it’s great science hacking. Did you know about using saturated salt solutions to produce constant humidity levels for calibration? We didn’t. The eBay hacker favorite, the so-called DHT22 module, doesn’t fare all that well, with one of six that [Robert] tested being basically horrible, and three of them breaking within two years of use.

The one that works well, however, is pretty good. The Bosch BME280 looks great. NASA's Radio JOVE Project: How to Solder. Thermoacoustic Engine has Only One Moving Part. Modern internal combustion engines have around 500 parts, with many of them moving in concert with the piston.

Thermoacoustic Engine has Only One Moving Part

But have you seen an engine with only one moving part, out of four in total? In the thermoacoustic engine, the power piston is the only part in motion. [YTEngineer] has built a very simple prototype that works on power provided by a tealight. His little engine, slightly larger than a cigarette lighter, is composed of a test tube that serves as the cylinder, a smaller tube, called the choke, that fits inside the test tube, the stack, which is nothing more than some steel wool, and the power piston. [YTEnginer] nicely explains how the engine works: basically a temperature difference is used to induce high-amplitude sound waves that create the piston’s back-and-forth movement. The thermoacoustic engine is a particular type of Stirling engine. Adding an IKEA Wireless Charger to a Project. IKEA sometimes seems like a DIY store disguised as a furniture store.

Adding an IKEA Wireless Charger to a Project

We may go there looking for a new sofa or kitchen table, but, to the DIY enthusiast, it’s a shop full of possibilities. While wandering through the local IKEA, [Erich Styger] noticed they had some Qi wireless chargers and receivers for a very reasonable price, so he bought a few and added wireless charging to his Mikroelektronika Hexiwear. [Erich Styger] didn’t like the clumsiness of the Hexiwear’s USB charging options and, at the price he got the IKEA Vitahult Qi phone case wireless receivers at, he couldn’t resist buying a few for his projects. After carefully separating the circuitry from the phone cases they came in he opening up the Hexiwear. He removed the battery connector and soldered the charger to battery charging circuit. Hacked CCFL Inverter becomes an Arc Lighter. [GreatScott!] Needs to light off fireworks with an arc rather than a flame, because “fireworks and plasma” is cooler than fireworks and no plasma. To that end, he attempted to reverse engineer an arc lighter, but an epoxy potted high-voltage assembly thwarted him.

Refusing to accept defeat, he modified a CCFL inverter into an arc lighter, and the process is pretty educational. With his usual impeccable handwriting and schematic drawing skills, [GreatScott!] This Reference Chart Covers the Basics of Soldering At a Glance. Ask Hackaday: Dude, Where’s My MOSFET? Transistors versus MOSFETs: both have their obvious niches. FETs are great for relatively high power applications because they have such a low on-resistance, but transistors are often easier to drive from low voltage microcontrollers because all they require is a current. It’s uncanny, though, how often we find ourselves in the middle between these extremes. What we’d really love is a part that has the virtues of both.

The ask in today’s Ask Hackaday is for your favorite part that fills a particular gap: a MOSFET device that’s able to move a handful of amps of low-voltage current without losing too much to heat, that is still drivable from a 3.3 V microcontroller, with bonus points for PWM ability at a frequency above human hearing. Bipolars Years ago, the obvious answer to this dilemma would be TIP120 or similar bipolar junction transistor (BJT) — and a lot more batteries. While the power Darlington is easy to drive, it has a few drawbacks. Trio of Magnetrons Power a Microwave Rifle. Can you build a working EM weapon from three microwave ovens? Apparently, yes. Should you do so? Maybe not when the best safety gear you can muster is a metallized Mylar film fetish suit and a Hershey’s Kiss hat. Proving that language need not be a barrier to perfect understanding of bad ideas, the video below tells you all you need to know, even without subtitles in the non-Russian language of your choice.

Become Very Unpopular Very Fast With This DIY EMP Generator. Taking a break from his book, “How to Gain Enemies and Encourage Hostility,” [FPS Weapons] shows us how to build our own handheld EMP generator which can be used to generate immediate dislike from anyone working on something electronic at the hackerspace. The device is pretty simple. A DC source, in this case an 18650 lithium battery cell, sends power to an “Ultra High Voltage 1000kV Ignition Coil” (as the eBay listing calls it), when a button is pressed. Electromagnetic Pulse: Pure Hollywood? Resistance in Motion: What You Should Know About Variable Resistors. Optimizing the Spread: More Spreadsheet Circuit Design Tricks. Dictionary: Mux/Demux. In this issue of Hackaday Dictionary, we cover the multiplexer and demultiplexer (also called mux and demux). Cirquids are the saltwater circuit boards of the future. RAMPS Merlin NEMA23 via THB6064AH 50volt 4amp stepper driver.

Home Made Diodes From Copper Oxide. We’re all familiar with semiconductor devices, and we should remember the explanation from high-school physics classes that they contain junctions between two types of semiconductor material. “N” type which in the for-schoolchildren explanation has a surplus of electrons, and “P” type which has “Holes”, or a deficit of electrons. Unless our careers have taken us deep into the science of the semiconductor industry though that’s probably as close as we’ve come to the semiconductors themselves. Circuit Simulator Lets You Play Around with Electronics Components in Your Browser.

When Difference Matters: Differential Signaling. We have talked about a whole slew of logic and interconnect technologies including TTL, CMOS and assorted low voltage versions. All of these technologies have in common the fact that they are single-ended, i.e. the signal is measured as a “high” or “low” level above ground. This is great for simple uses. Desoldering Doesn’t Necessarily Suck. Four Rigol oscilloscope hacks with Python. A Pragmatic Guide To Motors With Jonathan Beri. Piezoelectric Transformers are a Thing, Have You Used One? Embed with Elliot: Debounce your Noisy Buttons, Part I. Programmable Logic: Build Yourself a CPLD Module. Antennen im Eigenbau: aus Abfall, Baumarkt- und Verpackungsmaterial. Farbcode für Widerstände 2 - Rechner Farbcode Widerstand Berechnung Kennfarbe Widerstands Code Farb Ring Ringe - sengpielaudio.

Online RC Lowpass filter Calculator - Ekswai. (Sample)RC Low-pass Filter Design Tool - Result - How to Use an Oscilloscope. How and When to Use Protoboard — Skill Builder. Hacklet 80 – Gigahertz Projects. Code Craft: Subtle Interrupt Problems Stack Up. Stromausgang 0/4-20 mA in 0-5 Volt übersetzen. Why You Should Be Using a Linear Voltage Regulator. Mid-Priced Hardware Gets Serious About Software Defined Radio.

Learn Flip Flops with Simulation.