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David Bradshaw

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Looking for someone in Los Angeles knowledgeable in electrical engineering to help realize an artist's museum installation project. It consists of tiny Chinese firefly-circuit LED globes which need to be wired together and mounted at the ends of rigid tubes which are in turn mounted on boards running up a stairway. Send me a message if you're interested in working on this project.
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DIY #solarpower design. Avoid Brownouts and Dead SD Cards! How to figure out when to turn your #raspberryPi Off/On  http://www.switchdoc.com/2015/04/figuring-out-when-to-shutdown-your-solar-powered-raspberry-pi-weatherpi/
How to set your shutdown voltage in a Solar Powered Raspberry Pi System - WeatherPi.
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Jason T

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Looking for someone able to build a battery operated micro fan with integrated 12 hour timer. The timer would run once every 12 hours for 15 minutes. There would be two air valves that would need to open and close at the designated time for the 15 minutes. Also a battery life indicator would be nice. This device would be integrated into a plastic housing. Drop me a line if this is up your alley.
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Jeff DelPapa

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Call for participants, Build a racing sculpture.

A feature of Cambridge River Fest in the 80's, is returning from a long hiatus, http://sculptureracing.org   Creations were pushed, pulled, and occasionally pedaled on a course of up to a mile.  Pieces would stop and give little performances to the crowd.  Outlandish trophies were awarded.  Tongues may have been planted in cheeks.  Crowds were over 100 thousand strong.

The Artisans Asylum has been asked to build and race an entry in the re-inaugural event on June 6th. Here is a chance for the Asylum community to build a large and somewhat silly piece of art, and show their work (and the Asylum's name) off to many thousands of people.  An object almost as big as Stompy, but providing near instant gratification,  as it will be weeks rather than years in the making.

Starting on April 12th with an "organizational" meeting, and continuing Sunday mornings  till mid to late May, will be an open building event.  This isn't a class, its a project.  If you are a member, participation is free. (If you aren't a member, you are still welcome to participate, and a 5 pack of day passes should cover things)  Festivities will be from 10 am till around 2 PM, in the Tardis (aka MPR2).  On April 26 instead of building, we will be part of an exhibition at the MIT museum, a "Signature" event of the Cambridge Science festival, showing drawings, some work in progress, etc.

To honor the tool using focus of Artisans, and in a nod to another racing event that used to take place in Somerville, the plan is to build a scaled (up) super-modified class racing belt sander.  The finished machine (and the first order of business is coming up with a name for it) will be 10-15 feet long, and 5' wide.  We will be building it out of foam, with a metalized mylar (space blanket) skin, on a frame of steel and wood, with bicycle based running gear.


The prototype is an  early 60's model known to collectors as a "locomotive" style. Its going to have a whole bunch of sponsor stickers, like any good dragster, wheelie bars (that double as the push point), flames on the nose, and the ugliest piece of shag carpet or critter fur I can find as the sanding belt.

Here is a chance to figure out how most theatrical props get made, but this is for more than the foam carving brigade.  Costumes would be a great thing, and an area which I am completely clueless.  The machine could use lighting and sound effects.  Skunk, could SCUL come up with a Disco ball to replace the knob on the front?
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John Shovic

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Get more Weather data! Make Your Own  station for /#raspberrypi with WeatherRack/WeatherPiArduino 
Build your own weather station for Arduinos and Raspberry PI computers with WeatherPiArduino and WeatherRack
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SainSmart, a premier source of Arduino and Raspberry Pi controllers and add ons,  has installed new project and support forum software, eliminated the spamming of the forum, and hired new staff to answer questions and write documentation. Please check it out at http://www.sainsmart.com/vanilla/categories
Discuss SainSmart Products and Projects based on SainSmart Products.
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Alexander Turro

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Is this troll physics? Or would an equal weight on the opposite side of the belt keep the load in the position if I moved it to a certain height on the belt?
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Nigel Tolley's profile photoTravis Roderick's profile photo
41 comments
 
Assuming this is in a vacuum and no outside forces act on it, assuming that the cord is uniform thickness and the wheels are perfectly round...
The weights would stay in the same place, because the forces acting on the weights (mainly gravity) are not enough to overcome the friction caused by the pulley wheels and cord.
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Hank Barta

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Is this a good place to ask questions? I hope so!

I'm interested in using small devices like Arduino and other microcontrollers for doing Neat Things around the home. One of the basic building blocks I need is some kind of wireless communication. The devices don't necessarily need to communicate with each other but I do want communications with a PC (running Linux, if that matters.)

One of the processor boards I'm considerint is the STM32F4 Discovery. It costs about $15US. A WiFi module for it s $40US (and yes, I'm cheap! ;) )

Xbee also looks interesting but again tends to cost more than the microcontroller itself. There are other sort of unbranded wireless products for a lot less $$$. I wonder if any of these would be suitable? For my needs I don't think high bandwidth is needed. I just want to be able to exchange some sensor readings and probably some commands from time to time.

Ability to integrate with existing home automation products would be a plus but again, I'm happy to handle that on the PC side as long as the various parts have some sort of PC integration. For some of these cheap RF devices, I cold dedicate an Arduino if necessary as a communication gateway. Communication with XMPP would probably be nice as that sounds like a good platform for the PC side of this.

What wireless options are folks using for this and what are the tradeoffs? For example, the $40 price for the WiFi adapter includes source code for drivers that would save me a lot of coding time.

Thanks!
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Hank Barta's profile photoGordon Pimblott's profile photo
6 comments
 
+Hank Barta yes, I used the HC 05
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Ajay Behera

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I want to share a video link using Goolge plus V3 API using Java programmatically. I have tried everything but not succeeded. Can any one please help on this.
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Cliff Bramlett's profile photo
 
I'm not sure this is the right forum for finding you a solution. Someone is welcome to prove me wrong, but you might want to try the support section here:
https://developers.google.com/+/api/

Or
http://stackoverflow.com/questions/tagged/google-plus
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Who in this group is from Amsterdam, the Netherlands, and would like to come together to work on projects?


2 comments on original post
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Mat P

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shopvac vs fan
I was looking at DIY cyclone separators for a shop vac.  If I made a cyclone separator and hooked up a box fan to suck air through it, would that work?  A shop vac pulls about 140 CFM but a box fan does about 2000.  What I'm not sure about is, will the box fan give up as soon as there is an air restriction.  Might give it a try but thought I would throw it out there to see if anyone sees a big problem with it.  I would put a air filter or two before the fan so anything that makes it through the cyclone doesn't clog the motor. 
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Giligain I.'s profile photo
4 comments
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Aakash Patel

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Hi everyone I am looking for summer training or summer course in A.I.or Smart systems in India. plz help me to find one.
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Aaron Fraser

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Hey all - I've been practicing on a Trotec laser engraver, really liking it.

Wondering if there are any useful forums or communities for laser stuff - I'm trying to figure out how to do bas-relief in wood from photographs.  Thanks!
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Giligain I.'s profile photoAaron Fraser's profile photo
2 comments
 
I have access to the 400
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Hay all 3d printer issue here with the prusa i3 (surprise surprise). 
The issue is that the x axis is moving waayy too fast and wont stop at the end stop at all. The end stops are all plugged in and all working as they should apart from the x axis and it jolts horribly whenever i home the printer. any help would be great.
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Thomas Harrison's profile photo
6 comments
 
Fixed it was endstops haha
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Hey folks ... can you spare a minute please ...

At the KC Startup Weekend EDU event one of the groups is working on a Mobile Makerspace ... I know that this group has some feedback.  The form is geared towards educators but they really would like the Maker Community feedback too.

Can you help them get over 100 individual data points? 

http://goo.gl/MD6dbY

Thanks guys !!
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I have a question for the people who are probably smarter than me. I am writing a pythonscript that I want to use to control my servo with just my 3.5m audiojack. I have a quickly written up script that will wait for a command and just print "Success! moved to Position here" But Now I need it to actually send the waveform through the headphone jack. Sooo how can I generate those? Can a pythonscript generate the 50hertz signal needed to control the servo? Can i generate the signal for each stage, and have it play a certain soundfile depending on what I am asking it to do?

Thanks for the help in advance!
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Nigel Tolley's profile photoEli Youmans's profile photo
8 comments
 
True.... Alittle crude but if it works without too many bugs not a bad way to do it.
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What is the usual tolerance of a cell phone charge?  Is it always 5V?  I am seeing all sort of different battery packs with different voltages saying they will charge your cell phone.
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Matthew Martin's profile photoSam Freeman's profile photo
4 comments
 
In that case, you might want to use a voltage regulator. A 7805, or similar. Though you can probably bet on finding 1.5v alkalines at any gas station.
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Richard Haven

Project Help  - 
 
I'm trying to design a system that will send power to system B when it detects power going to system A (basically a diode for house current).

I don't want to interfere with system A's wiring (even with a pass-through plug), so I'm thinking that a current/voltage detector wrapped next to system A's power cord. Where would I find this sort of thing? Should a disassemble a Fluke? How would I wire that into an Arduino?

Thanks for the pointers
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Richard Haven's profile photoJon Rabone's profile photo
6 comments
 
Transistor and mains-rated relay. Or opto-isolated mains switch. A microcontroller might help if you want to do some signal processing - eg. delay start, remove noise, hold the output for a specified time.

You do need access to just the hot conductor - current sensors won't work if you just apply them to the entire mains cord.
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I am a design student, and i need to make a mockup of a sort of Seismograph/polygraph machine. I need to build the mechanism that can draw a simple graph like what is seen in a lie detector(polygraph)/seismograph, on paper.

Can you guys lead me in any direction on where to look for instructions?
It could also be an cheap existing device that can be modified into drawing like a seismograph/polygraph.

Thanks in advance.

-Anders, Denmark
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Anders Astrup Andersen's profile photoMike Barela's profile photo
5 comments
 
Both could probably work. 
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Simple 8086 Assembly Language Programs with Explanation
#electricalengineering   #electronicsengineeringstudents  
Assembly language programming 8086 is hardware oriented programming language which provides architecture and registers functionality for 8086 processors
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Gilles Frenette's profile photoNorman Davie's profile photo
2 comments
 
Gilles,it's very important with embedded systems where resources are at a minimum and maximum speed is required.
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