Senza categoria Commenti disabilitati su 26/2/15
Conclusio: El extrusor i esl sesus sensors estan be
Un cop demostrat lo del extrusor ens hem centrat amb els servos intentant que funcionessin amb la font de alimentacio apart, no vam conseguir res. El proxim dia ens centarem al el servo del capçal ja que creiem que es el que te el porblema, e
Fubar Hackerspace (New Jersey) member Graham has been working on an open source liquid fuel rocket engine with regenerative cooling and precise flow control build on Arduino Uno. In order to test it he’s also built a cool rig for testing propellant flow control:
My project is building Open Source 3D Printed Rocket Engines with Arduino microcontrollers. As an individual interested in building liquid fueled rocket engines as a hobby I quickly realized there were almost no resources online or forums to share or learn from others. I decided to combine my interests in Software, hardware and open source projects to develop and build a functioning liquid fueled rocket engine. However, unlike most other projects it had to be open source and easily re-produced.
In order to ensure it was as open source as possible I used the Arduino Uno board and IDE to develop software to safely control the engine. To meet the easily reproducible requirement I decided that 3D printing was the right approach rather than labor/time intensive traditional machining.
The end result is an engine that can easily be reproduced or modified. This gives others interested in this hobby a starting point for best practices, safety, etc… so that future projects aren’t starting out from scratch.
Here’s the video of the testing of the 3D Printed GOX/Ethanol Injector:
Who doesn’t like Star Wars, LEDs, and music? [Stathack] was looking for a unique piece of art to put in his living room… so he decided to make his own Vader EQ.
The EQ is a massive 4′ x 5′ piece made from plywood and MDF. [Stathack] traced the familiar helmet onto it by using a projector to project the outline onto the surface. Not having access to an extra large CNC or laser, he then painstakingly used a jigsaw to cut out all the white pieces of the design — holy cow.
This process only took weeks and weeks of sanding, filling and sanding again due to the excellent precision of a jigsaw.
Once that was all done, he created the backing plate out of MDF to provide structural support and mounting locations for the LEDs. Bit of spray paint later and a simple circuit with the Arduino and it’s both done, and awesome.
Too bad he filmed the video vertically… sigh.
Need more Vader? How about your own Sous Vadar?
Filed under: Arduino Hacks, led hacks
And there is more! You can take part of the event not only as a visitor but also as a protagonist. Today we’ve opened the call for volunteers, projects and talks. You’ll be having fun with us and Arduino!
Are you interested? These are the requirements:
– Must be comfortable with simple Arduino hardware and software
– Must be able to explain Arduino concepts to visitors without overwhelming them with technical details
– Must be able to engage in friendly conversations with strangers
We’ll offer as a token of appreciation an official Arduino t-shirt, lunch, and a discount coupon for our online store!
Are you interested? Fill the form. We’ll ping you back! Thanks!
[Gr4yhound] has been rocking out on his recently completed synth guitar. The guitar was built mostly from scratch using an Arduino, some harvested drum pads, and some ribbon potentiometers. The video below shows that not only does it sound good, but [Gr4yhound] obviously knows how to play it.
The physical portion of the build consists of two main components. The body of the guitar is made from a chunk of pine that was routed out by [Gr4yhound’s] own home-made CNC. Three circles were routed out to make room for the harvested Yamaha drum pads, some wiring, and a joystick shield. The other main component is the guitar neck. This was actually a Squire Affinity Strat neck with the frets removed.
For the electronics, [Gr4yhound] has released a series of schematics on Imgur. Three SoftPot membrane potentiometers were added to the neck to simulate strings. This setup allows [Gr4yhound] to adjust the finger position after the note has already been started. This results in a sliding sound that you can’t easily emulate on a keyboard. The three drum pads act as touch sensors for each of the three strings. [Gr4yhound] is able to play each string simultaneously, forming harmonies.
The joystick shield allows [Gr4yhound] to add additional effects to the overall sound. In one of his demo videos you can see him using the joystick to add an effect. An Arduino Micro acts as the primary controller and transmits the musical notes as MIDI commands. [Gr4yhound] is using a commercial MIDI to USB converter in order to play the music on a computer. The converter also allows him to power the Arduino via USB, eliminating the need for batteries.
Filed under: Arduino Hacks, musical hacks
arduino, crowdfunding, Electronics Commenti disabilitati su Cellular Connectivity Comes to Microcontrollers With The Spark Electron
Arduino LLC is suing Arduino Srl (the Italian version of an LLC). Sounds confusing? It gets juicier. What follows is a summary of the situation as we learned it from this article at Heise.de (google translatrix)
Arduino LLC is the company founded by [Massimo Banzi], [David Cuartielles], [David Mellis], [Tom Igoe] and [Gianluca Martino] in 2009 and is the owner of the Arduino trademark and gave us the designs, software, and community support that’s gotten the Arduino where it is. The boards were manufactured by a spinoff company, Smart Projects Srl, founded by the same [Gianluca Martino]. So far, so good.
Things got ugly in November when [Martino] and new CEO [Federico Musto] renamed Smart Projects to Arduino Srl and registered arduino.org (which is arguably a better domain name than the old arduino.cc). Whether or not this is a trademark infringement is currently being heard in the Massachussetts District Court.
According to this Italian Wired article, the cause of the split is that [Banzi] and the other three wanted to internationalize the brand and license production to other firms freely, while [Martino] and [Musto] at the company formerly known as Smart Projects want to list on the stock market and keep all production strictly in the Italian factory.
Naturally, a lot of the original Arduino’s Open Source Hardware credentials and ethos are hanging in the balance, not to mention its supply chain and dealer relationships. However the trademark suit comes out, we’re guessing it’s only going to be the first in a series of struggles. Get ready for the Arduino wars.
We’re not sure if this schism is at all related to the not-quite-open-source hardware design of the Yun, but it’s surely the case that the company is / the companies are going through some growing pains right now.
Thanks [Philip Steffan] for the pointer to the Heise.de link. (And for writing it.)
Filed under: Arduino Hacks, news, slider
by Francesco Truzzi :
Some time ago I came across a new chip from TI, the HDC1000. It’s a temperature and humidity sensor with I2C interface and requires little to no additional components. It comes in an 8BGA package: we can all agree it’s pretty small.
Some of the peculiar characteristics of this chip are that it has a DRDYn pin which goes low any time there is a new reading from the chip (so you can precisely time your requests) and that the sensor is located on the bottom of the IC, so that it’s not exposed to dust and other agents that may false the readings. Also, it has an integrated heater that can remove humidity from the sensor.
So I developed a very small breakout board for this chip as well as an Arduino library (yay, my first one! raspberryPi and nodemcu might come next).
HDC1000 temperature and humidity sensor breakout, with Arduino library! - [Link]
Twitter telegraph is a project by Devon Elliot making telegraph sounder tap out Twitter messages using Arduino Uno. It’s an interesting attempt to connect technology rooted in the 19th- and early 20th-centuries with 21st-century networks:
A local architectural heritage project spawned a wider interest in railways and roundhouses. One of the related technologies of railways in the 19th century was the telegraph. Having acquired an old telegraph sounder, we wondered if it could tap out Twitter messages.
An Arduino UNO was used to test and control the telegraph sounder. The coils on the telegraph were tested with power drawn from the Arduino’s 3.3V and 5.0V pins. Momentarily powering the telegraph from the Arduino confirmed that the coils still worked, and the device made satisfying clicks in response from the electromagnetic action of the coils.
With it confirmed that the telegraph is still operable, the Arduino UNO was then used to control the sounder. Mark Fickett’s Arduinomorse library was a quick route to controlling the telegraph in Morse code timing. Using that library, string characters are converted into Morse code, and a digital pin on the Arduino goes high and low, as if to turn an LED on and off. That pin became the control pin for the telegraph, and simple circuit was built using a transistor, resistor and diode to control the telegraph without damaging the Arduino’s digital pins. This circuit is common for connecting relays to Arduinos.
The final step was adding an Adafruit FONA to the Arduino. The FONA connects to cellular phone networks, and the Arduino UNO can interact with it by sending and receiving actions to and from the FONA. In this case, the FONA connects to the cellular network and the Arduino checks the FONA periodically to see if there are any SMS messages available. If there are, the Arduino starts to read through them, convert them to Morse code, and tap them out on the telegraph.
The completed device can be operated from batteries if necessary, providing operation anywhere a cellular signal can reach. The cellular connection provides wireless connectivity with the FONA handling the connection, rather than the Arduino.
To package it up, the Arduino UNO and FONA were attached to a piece of acrylic. That board was then mounted under the telegraph sounder’s resonator. Four holes were pre-existing in the resonator’s base and used for mounting, so no permanent alterations were made to the historic components.
See it in action: