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Acoustic Barcodes by Chris Harrison
We present Acoustic Barcodes, structured patterns of physical notches that, when swiped with e.g., a fingernail, produce a complex sound that can be resolved to a binary ID. A single, inexpensive contact microphone attached to a surface or object is used to capture the waveform. We present our method for decoding sounds into IDs, which handles variations in swipe velocity and other factors. Acoustic Barcodes could be used for information retrieval or to triggering interactive functions. They are passive, durable and inexpensive to produce. Further, they can be applied to a wide range of materials and objects, including plastic, wood, glass and stone.
barcode  audio  acoustic  sound  identification  hackaday 
22 hours ago by cyberchucktx
Is There a Common Mechanical Parts Library? | Hackaday
Is there a readily accessible online library of common mechanical parts? My first reaction to Nate’s question was, “Sure there is — it’s called the McMaster-Carr catalog.” The voluminous gold and green dead-tree version and its online equivalent are valuable references for anything and everything mechanical. But McMaster’s stock really represents more of the universe of parts as opposed to a well-defined list of commonly specified parts.

It turns out that Nate has something else far more interesting in mind, and it’s based more on his experiences with electronics parts ordering.
library  parts  hackaday  reference 
7 days ago by cyberchucktx
The “P Cell” is Exactly What You Might Suspect @ Hackaday
[Josh Starnes] had a dream. A dream of a device that could easily and naturally be activated to generate power in an emergency, or just for the heck of it. That device takes in urea, which is present in urine, and uses it to generate a useful electrical charge. [Josh] has, of course, named this device the P Cell.

An early proof of concept uses urine to create a basic galvanic cell with zinc and copper electrodes, but [Josh] has other ideas for creating a useful amount of electricity with such a readily-available substance. For example, the urea could be used to feed bacteria or micro algae in a more elegantly organized system. Right now the P Cell isn’t much more than a basic design, but the possibilities are more than just high-minded concepts. After all, [Josh] has already prototyped a Hybrid Microbial Fuel Cell which uses a harmonious arrangement of bacteria and phytoplankton to generate power.
energy  power  renewable  pcell  hackaday 
9 days ago by cyberchucktx
Beginning BLE Experiments And Making Everything Better | Hackaday
This is the first in a two part series on building with BLE devices. First, I’ll survey some BLE devices and how to get started with BLE from the Linux command line. Later, we will go into describing the process of making a NodeJS cross-platform app that will leverage the BLE capabilities and connect it to the Internet.
bluetooth  ble  hackaday  article  tutorial  wireless 
12 days ago by cyberchucktx
NP-41 RPN Calculator | Hackaday.io
NP-41 is a hardware realization of the Nonpariel calculator simulator. It executes the original HP-41C / CV byte-codes.
hackaday  hardware  community  open-source  RPN  calculator  projects  electronics 
13 days ago by squishyrobot
PTPM Energy Scavenger Aims for Maintenance-Free Sensor Nodes | Hackaday
[Mile]’s PTPM Energy Scavenger takes the scavenging idea seriously and is designed to gather not only solar power but also energy from temperature differentials, vibrations, and magnetic induction. The idea is to make wireless sensor nodes that can be self-powered and require minimal maintenance. There’s more to the idea than simply doing away with batteries; if the devices are rugged and don’t need maintenance, they can be installed in locations that would otherwise be impractical or awkward. [Mile] says that goal is to reduce the most costly part of any supply chain: human labor.

The prototype is working well with solar energy and supercapacitors for energy storage, but [Mile] sees potential in harvesting other sources, such as piezoelectric energy by mounting the units to active machinery. With a selectable output voltage, optional battery for longer-term storage, and a reference design complete with enclosure, the PPTM Energy Scavenger aims to provide a robust power solution for wireless sensor platforms.
hackaday  energy  power  sensors  harvesting 
14 days ago by cyberchucktx
BlinkBox: Debugging Tool For Addressable LEDs | Hackaday
[Devon] does a lot of work with addressable LEDs of different types and after much experience, created the BlinkBox, a dedicated test tool for addressable LEDs. It supports multiple LED chipsets, you can give it a count of the LEDs you want to light up, and you can choose a test animation. It even writes your settings to an EEPROM so you that don’t have to repeat yourself when you next turn it on.
hackaday  leds  neopixels  test  diagnostics 
21 days ago by cyberchucktx
Making Modular Hardware with Assad Kaadan this Friday on
hackaday  poster  from twitter_favs
21 days ago by todbot
Twenty Power Harvesting Projects Headed to the Hackaday Prize Finals | Hackaday
Last week, we wrapped up the Power Harvesting Challenge portion of The Hackaday Prize. Now we’re happy to announce twenty of those projects have been selected to move onto the final round and have been awarded a $1000 cash prize. Congratulations to the winners of the Power Harvesting Challenge portion of the Hackaday Prize.
hackaday  energy  power  harvsting  contest 
22 days ago by cyberchucktx
This is a tale as old as time. Not love, it is about keeping something you made safe from those who would destroy something beautiful. In this case, the thing of beauty is a talking banana who reads Twitch and Youtube comments. The ne’er-do-wells are trolls seeking to ban-anana the account by forcing it to recite restricted words.

The problems stem from a visit from [Greekgodx], whose followers tend toward the dark side. When they set their sights on [Mike Nichols]’ yellow automaton, things slipped into a bleak place, and a twenty-four-hour ban falls on the fruit. A bunch of filtering is done, but it isn’t enough to stop the trolls, and the tally-man adds a second permanent strike against the account. An arms race of slurs and filtering ensued until the robot was able to reject all attempts at racism.

The banana has since been peeled from the feeds
hackaday  banana  racism  censorship  socialmedia  humor  robotics 
26 days ago by cyberchucktx
Energy Harvesting Design Doesn’t Need Sleep | Hackaday
Every scrap of power is precious when it comes to power harvesting, and working with such designs usually means getting cozy with a microcontroller’s low-power tricks and sleep modes. But in the case of the Ultra Low Power Energy Harvester design by [bobricius], the attached microcontroller doesn’t need to worry about managing power at all — as long as it can finish its job fast enough.

The idea is to use solar energy to fill a capacitor, then turn on the microcontroller and let it run normally until the power runs out. As a result, a microcontroller may only have a runtime in the range of dozens of microseconds, but that’s just fine if it’s enough time to, for example, read a sensor and transmit a packet.
energy  harvesting  energyharvesting  power  green  hackaday 
27 days ago by cyberchucktx
Global Radio Direction Finding in Your Browser | Hackaday
Radio direction finding is one of those things that most Hackaday readers are likely to be familiar with at least on a conceptual level, but probably without much first-hand experience. The RTL-SDR Blog has run a very interesting article wherein they describe how the global network of Internet-connected KiwiSDR radios can be used for worldwide radio direction finding. If you’ve got a target in mind, and the time to fiddle around with the web-based SDR user interface, you now have access to the kind of technology that’s usually reserved for world superpowers. Indeed, the blog post claims this is the first time such capability has been put in the hands of the unwashed masses. Let’s try not to mess this up.
hackaday  radio  gps  finding  sdr  softwaredefinedradio 
29 days ago by cyberchucktx
Quantum Computing For Computer Scientists | Hackaday
Quantum computing is coming, so a lot of people are trying to articulate why we want it and how it works. Most of the explanations are either hardcore physics talking about spin and entanglement, or very breezy and handwaving which can be useful to get a little understanding but isn’t useful for applying the technology. Microsoft Research has a video that attempts to hit that spot in the middle — practical information for people who currently work with traditional computers.
hackaday  computing  article  quantum  quantumcomputing 
4 weeks ago by cyberchucktx
Ridiculously Complicated Home Automation Made Simple | Hackaday
[Eric T] wrote up his insanely-comprehensive home automation setup. What started out as a method to notify him when his dog barked grew into a whole-house, Arduino-powered sensor extravaganza. We’ve previously looked at two different steps from this mammoth article. One automated his dog, the other focused on the Wink hub to bridge with commercial hardware like smart lightbulbs. Now let’s look at the project as a whole.
hackaday  homeautomation  diy  openhab 
4 weeks ago by cyberchucktx
High Efficiency MPPT Solar Charger | Hackaday.io
This is an open source project that I've been working on for several years now. From its modest beginnings it has evolved to a rather sophisticated device with a USB interface, powerful USB charging ports, a 20x4 character LCD, a rotary encoder with push button, precision measurement of everything from temperatures, voltages and currents. There are 4 switchable power outputs, a year's worth of data logging with real time clock and calendar. It connects to a desktop app via USB where users can monitor and adjust every aspect as well as see what the charger did while they were away.
But what makes this charger truely special is its extremely high efficiency of around 97% over a very wide power range from 1 to 75 watts.
hackaday  solar  energy  charger  arduino 
5 weeks ago by cyberchucktx
Open Hardware Takes Charge in Papua New Guinea | Hackaday
[Marius Taciuc] wants to change all of that. At the suggestion of his friend [Brian], he designed an intermediary device that takes any input and converts it to clean 5 volts with a low-cost, reliable buck converter. The inputs are a pair of alligator clips, so they can be connected to car battery terminals, bare-wire solar panel leads, or 9V connectors.
power  hackaday  energy  charger  usb  solar 
5 weeks ago by cyberchucktx

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