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Findings

TheBackyardScientist shares the techniques he uses to lean on the Lichtenberg Figure effect to produce gorgeous burn patterns onto wood. Via hackaday.

What happens when you apply 2000v (2KV) to moist wood? You get a beautiful fractal image known as a lichtenberg figure. If you want to try it yourself, your in luck! In this album I am going to go over the process in detail...
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GreatScottLab shared a helpful video and brief tutorial guide that explores how difficult it is to get an accurate temperature reading, and what you can do to improve your process. This is key for a number of diy electronics, fabrication, and robotics projects -- especially FFF-style desktop 3D Printing:

In this project I will show you how the resistance of different materials is used to measure accurate temperatures. The project will include information about NTC thermistors, PT100, Wheatstone bridge, LM35 and DS18B20. And at the end I will show you how to build a simple thermometer. ....
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ZeptoBars posted this gorgeous teardown (break apart?) piece exploring the contents of the ULN2003 seven channel Darlington driver chip. Beautiful object AND informative post!

We often receive comments that while our microchip photos are beautiful and interesting, it is completely unclear how integrated circuit implements basic elements and form larger circuit. Of course it is impossible to do a detailed review of an 1'000'000 transistor chip, so we've found simpler example: ULN2003 - array of Darlington transistors. Despite it's simplicity this microchip is still widely used and mass manufactured. ULN2003 contains 21 resistors, 14 BJT transistors and 7 diodes. It is used to control relatively high load (up to 50V/0.5A) from microcontroller pin. Canonical use case - controlling segments of large 7-segment LED displays.
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A while ago, we made a blog post about printing a circuit on a banana. That's why when we saw Steven Rodrig's Bananadata we couldn't resist sharing it.

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Handy MatLab visualization that Mehmet created and posted to Mathworks that demonstrating the Fourier Series, a core concept for DSP work. You can watch the entire video here as well (posted below). Via Hackaday, who also recommended checking out Bill Herd's excellent "Sine Waves, Square Waves and FFTs" video:

Any periodic signal can be decomposed into a set of simple oscillating functions (also known as harmonics) via the application of Fourier series expansion. Here, we demonstrate a few harmonics using circles and how they add up to obtain the resulting function. Each circle spins at a multiple of a certain fundamental frequency. First, we show each harmonic individually and later show what they add up to and how the circles can be used for their visualization....

 

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The goal of this post is to level the playing field between hardware and software startups. Software has had decades to find reproducibly successful models in different verticals (such as SaaS and Freemium mobile games), but hardware has only had the last few years. The knowledge exists, but it hasn't been distributed evenly. Through interviewing the founders that do this every day, hopefully we can change that.

Haytham is an excellent guy and one of the first people I met in the hardware scene upon moving to New York. He runs the very popular NY Hardware Meetup which is attended by hundreds of people every month and boasts a presenter list that reads like the who's who of the hardware world. He is also the CEO of his own hardware startup, Kinetic which seeks to eliminate employee injuries in warehouses brought about by incorrect lifting practices with their wearable device.

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From Daniele Hopkins and Kyle Duffield - Documentation of The LEAP Engine! running on Arduino Mega and custom electronic circuits. via Arduino.

Laser Equipped Annihilation Protocol (The L.E.A.P. Engine) is a live-action gaming environment that explores the personality of a snarky and mysterious game sentience who has infected a room with technological systems that challenge players and collect data. With a limited amount of time, the player must pass through a complicated series of changing and alternating laser patterns without tripping any of the lasers in order to deactivate the system and win the game. If the player trips a laser or if the timer runs out, it’s game over....
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Good job! That hurts my eyes just looking at that component. ;-) synthead on reddit:

Smallest successful soldering job I've done to date .... This was done with hand tools, and it takes a lot of very slow, careful movements. What's worse is that I accidentally removed this resistor, and this part of the circuit detects battery overheating. So I am guessing values while the phone says the battery temp is too low and too high. I'm on the fourth attempt at a good value, and that's good for tonight....
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Artist Xin Liu held a sold-out workshop at Eyebeam last week -- experimenting with conductive ink on bare skin! From Adafruit:

People have been experimenting with conductive body tattoos and flexible circuits, but Xin Liu’s recent workshop at Eyebeam, NY, really showed the interface possibilities. Participants painted circuits on their arms using Bare Conductive Ink and then connected the traces to the guts of an air mouse strapped onto the wrist with an elastic band. The idea was to create a human mouse using hand gestures, kind of like a more interesting version of Makey Makey. One participant put his jewelry to good use and managed to connect to his Android phone. Love that!
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Proto G has been catching our attention for a few weeks now, with impressive melds of 3D printing and electronics. Perhaps none are as impressive as his 3D Printed Stepper Motor (version 1.1 to add NeoPixels to his first project!):

This is a follow up to my previous instructable of my 3D Printed Stepper motor I designed to show others how stepper motors work. Many people had mentioned adding LEDs to help visualize which coils were activating. Looking through my part bins I found the perfect 16 NeoPixel ring from Adafruit. It's a coincidence that it fit perfectly under the electromagnets. I couldn't have planned that any better. In this instructable I will show you how to add the NeoPixel rings to the stepper motor.
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