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Making an audio spectrum analyzer with a microcontroller
While [Vinod] says he’s not an expert in this sort of thing, we really like his audio spectrum analyzer build from a simple microcontroller and LCD display. It is a well-studied fact that every audio...
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Hackaday Links: November 29th, 2012
EMC2 CNC keyboard labels If you’ve got a dedicated computer running EMC2 for CNC control you may be interested in these keyboard labels. [Rich] mentions that they use the labels for their engraver at...
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Color LED matrix VU meter shows how to use FFT with Arduino
If you’ve ever wanted to make your own VU meter but were scared off by the signal process you need to study this tutorial. Hackaday Alum [Phil Burgess] developed the device using an RGB LED matrix,...
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Building a spectrum analyzer with parallel processing
It’s the end of the semester for [Bruce Land]‘s microcontroller design class at Cornell, and the projects coming off the workbench this semester look as awesome as any before. For their final project,...
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Stellaris Launchpad and booster packs used as frequency analyzer
[Jordan Wills] got tired of being limited to eight pixels of resolution and having jumper wires littering his work space. He set out to upgrade his Stellaris Launchpad frequency analyzer project using...
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Magic eye spectrum analyzer
If Nixies aren’t cool enough, maybe it’s time to step it up to magic eye tubes. Magic eye tubes are, like Nixies and Dekatrons, display tubes. Unlike the alphanumeric characters of Nixies or...
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Retrotechtacular: The Fourier Series
Here’s a really quick video which takes a different approach to understanding the Fourier Series than we’re used to. If you’re a regular reader we’re sure you’ve heard of the Fourier Series (often...
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Hackaday Links: October 27, 2013
[Kyle] came across a project which he thinks is “simply elegant”. If you don’t already have a PCB vice, here’s an easy way to build one of your own. This one’s so good but alas it’s not a hack. Check...
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FFT On The Raspi’s GPU
The Raspberry Pi has been around for two years now, and still there’s little the hardware hacker can actually do with the integrated GPU. That just changed, as the Raspberry Pi foundation just...
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Thumbs-Down Songs on Pandora with Your Mind
[Steven] likes music. Like many of us, he uses Pandora to enjoy the familiar and to discover new music. Now, Pandora means well, but she gets it wrong sometimes. [Steven] has had a Mindwave Mobile EEG...
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Analog Shield and PCB Quadcopter
We spent a little bit of time at the TI booth at Maker Faire to film a pair of interviews. The first is with [Bill Esposito] who is grinding away on his PhD. at Stanford. He’s showing off an Analog...
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Measuring Car Engine RPM via the Cigarette Lighter
Sometimes we forget how many things we can do with a simple oscilloscope. In this video [Ben] uses one that Tektronix lent him to measure his DeLorean engine RPM. By checking the car main ~12V voltage...
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The Teensy Audio Library
There are a few ways of playing .WAV files with a microcontroller, but other than that, doing any sort of serious audio processing has required a significantly beefier processor. This isn’t the case...
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Sine Waves, Squares Waves, and the Occasional FFT
I became aware of harmonics and the sound of different shaped waveforms early in my electronics career (mid 1970’s) as I was an avid fan of [Emerson Lake and Palmer], [Pink Floyd], [Yes], and the list...
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Easy and Effective Way to Measure PWM… Without a Scope!
Sometimes when a project is coming together, you need to cobble a tool together to get it completed. Whether it’s something very involved, like building a 3D printer to fabricate custom parts, or...
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Is That a Tuner in Your Pocket…?
As a musician, it’s rare to consistently recognize with the naked ear whether or not a single instrument is in tune. There are a number of electronic devices on the market to aid in this, however if...
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Dirt Cheap Motor Balancing and Vibration Analysis
Ever the enterprising hacker and discerning tool aficionado, [Chris] knows the importance of “feel”. As a general rule, cheap tools will shake in your hand because the motors are not well-balanced. He...
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Spectrum Analyzer on the Cheap
Provided you have an NTSC-compatible TV you can build yourself a really inexpensive spectrum analyzer. From there you just need one trivial piece of hardware to complete this build. [Bruce Land] has...
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Visualizing the Fourier Transform
If you do any electronics work–especially digital signal processing–you probably know that any signal can be decomposed into a bunch of sine waves. Conversely, you can generate any signal by adding up...
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A Better Spectrum Analyzer for your Rigol Scope
The Rigol DS1000 series of oscilloscopes are popular with hobbyists for good reason: they provide decent specs at a low price. However, their spectrum analysis abilities are lacking. While these scopes...
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