Show Posts
Pages: 1 2 [3]
31  Forum 2005-2010 (read only) / Interfacing / Re: how to control 24 servos with ¬†maxuino on: June 08, 2010, 11:44:42 pm
Hello, one of the maxuino guys here.  I know that Firmata will allow you to use any digital pin to do servo control, and so in theory you could use an arduino mega with firmata and maxuino to control all of your servos...in theory.  I have heard some reports that there is a point where firmata and the arduino just cannot manage all the various simultaneous pwms needed for more than 6-10 servos...but i haven't tried it for myself.  As to the power supply, use your multimeter and check what amperage the red or black wire is pulling when you turn the servo (remember the multimeter has to be in line of the circuit to do this test, not just touching two places like you can test for voltage) and then multiply.  I would guess you would need at least 5-10amps for that many servos...pure guess tho.
look forward to hearing how you make out.
Chris
32  Forum 2005-2010 (read only) / Interfacing / Re: Arduino + light bulb + relay + Max/MSP= need HELP! on: April 12, 2010, 05:09:22 pm
Also, you should see our Maxuino project that will make it super easy to bridge Max to your arduino.  Maxuino.org
33  Forum 2005-2010 (read only) / Interfacing / Re: Getting wind speed data From a pc fan? on: October 10, 2009, 11:05:42 pm
I believe the problem would be the high resistance of the fan due to the magnets would nullify much of the wind power and so give you a very innacuarate account of the wind speed.  If you only want to know the difference between 10 and 20 mph you might be fine, but most of the fans I have dealt with would fail to register anything from 0-10mph.  if you can find a fan that has almost zero resistance and then figure out how to make sure it faces into the wind, perhaps it is possible, but not ideal.  A test might just be to blow softly on the fan and see if it turns.
34  Forum 2005-2010 (read only) / Interfacing / Re: control 8x8 electronic fan matrix? on: September 07, 2009, 09:13:08 pm
what you are doing is a bit more complex because i was just using shift registers, but you might enjoy this piece in my grad thesis show using 220 fans...
http://digitalcoleman.com/physical2.html
35  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino in the Classroom: Getting Started on: November 02, 2010, 12:28:19 pm
Both adafruit and Sparkfun have great starter kits with everything you would need to have fun and teach with, ranging from 60-90$ per kit.  For instance I am getting the ARDX kits from sparkfun because they come with circuit diagram cards and motors and the sort of physical stuff that makes for exciting interaction beyond the standard LED setups.

The arduino UNO is the flagship, both in that it is the most widely used and supported, and it is big, which is great for learning but probably too large for many micro sized projects.

The arduino kits are pretty much all breadboard experience, so no soldering is needed. Beware of getting some arduino add-on shields to as many of them are assembly required with a soldering iron.  Of course soldering all of those breadboards for your students will get you really good at soldering really quick.

The arduino is very easy to program, it is a breeze to pick up and a breeze to teach.  thats why it is so popular, and again the community is great resource.

you should understand some basic electronics, and there are a few arduino specific books out there "getting started with arduino" that cover the electronic basics in addition to the programming basics.

the arduino is pretty robust, it can be toasted with a bad wire, but it is rare, and at a $30 replacement, is not terribly tragic.  I have not had any cases where bad code bricks it, as the arduino IDE takes care of much of the coding for you and keeps the dangerous stuff hidden.

Absolutely you can set 14 year olds up with it...they will love it.
36  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help on Arduino and MaxMSP on: August 11, 2010, 02:29:49 pm
Check out our project at Maxuino.org for an easy way to get max talking to your arduino.  the duemilanove will be capable for sure, just know that the board will control relays which will then turn on and off your motors or solidnoids, you wouldnt run anything directly off the arduino because it would probably draw too much power.
Chris
37  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: 4-Button Sequencial Code using Arduino ? on: March 12, 2010, 03:36:18 pm
That will be super simple to do and should give you little to no trouble.  You would do some simple programming with the free Arduino software to listen to 4 digital pins as inputs and use variables to track if the correct sequence has been pressed thru several "if" statements. then you would tell another digital pin to output HIGH and that would supply voltage for a small relay.  
the only hard part will be choosing which flavor of arduino you want!
Chris
38  Forum 2005-2010 (read only) / Bar Sport / Re: Hello world!!! on: February 26, 2009, 02:14:29 am
great place to find all the answers!
Pages: 1 2 [3]