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1276  Using Arduino / Motors, Mechanics, and Power / Re: Stepper overheating on: November 15, 2012, 11:07:50 pm
The only reason you would drive the motor over its 6V rating (which will result in its 1.2A limit) is if you want more speed from the motor.

If you do drive it over its 6V rating them you must prevent it from passing its 1.2A limit. You can do this with a "chopper" driver or by adding high wattage resistors on the wires to the coils of the motor.

Take note that the chips on your Adafruit board are limited to 1.2A. If you have not blown the chips already then it will happen soon.

http://www.pololu.com/catalog/product/1182 is a very popular driver and has current limiting capability. Your stepper has 6 wires so it can be driven in a bipolar mode as this driver requires.
1277  Using Arduino / Project Guidance / Re: Vibrating motor musical instruent help on: November 15, 2012, 10:49:12 pm
If you had some kind of cushion between the motor and your vibrating surface you could press the motor against the surface for more volume?

Second idea, attach the vibrating motor to a servo arm and the servo to the vibrating surface. When the servo arm is parallel to the surface the amplitude of the vibration should be less than when the servo arm is perpendicular to the surface.
1278  Using Arduino / Project Guidance / Re: Read battery voltage remotely? on: November 15, 2012, 10:42:10 pm
Any Arduino will do (Uno compatible / ATMega328 chip) and then you also need an ethernet shield, preferably one with a Wiznet W5100 chip. Combined the two should be less than $40. You can find lots of examples of how to serve a web page if you do a little searching.

To read your voltage you just need a couple resistors. If you have any interest in electronics you should buy an assortment pack of resistors, but if you just want to do this one project then a 10K potentiometer or seven 2200 ohm resistors would work (when combined to form a 8800 and 6600 ohm resistance). http://fritzing.org/projects/voltage-divider/ for an example.
1279  Using Arduino / Project Guidance / Re: Everybody hates Newbies...BUT on: November 14, 2012, 06:46:51 pm
http://www.arduino.cc/en/Tutorial/button shows how to use a button.
http://www.arduino.cc/en/Tutorial/Blink shows how to use an LED.

1280  Using Arduino / Project Guidance / Re: 38khz Led Reciever Autonomous Robot on: November 14, 2012, 06:44:24 pm
Code:
void IR38Write() {
  for(int i = 0; i <= 5; i++) {
    digitalWrite(IRledPin, HIGH);
    delayMicroseconds(13);
    digitalWrite(IRledPin, LOW);
    delayMicroseconds(13);
  }
}

It's only a series of 5 blinks; the IR receiver requires 6 minimum. The "letsmakerobots" example code -- which you should probably follow -- uses 384.
1281  Using Arduino / Project Guidance / Re: Want to emulate a rotary encoder, have a couple of questions. on: November 14, 2012, 06:19:25 pm
You should look into finding out if your car sends its steering wheel controls (volume up, etc.) through the car's OBD-II system.
1282  Using Arduino / Project Guidance / Re: 38khz Led Reciever Autonomous Robot on: November 14, 2012, 06:04:35 pm
Post the code that you have now.
1283  Using Arduino / Project Guidance / Re: Humidistat for ventilation on: November 13, 2012, 10:45:47 pm
Take a look at the "DHT11" (or 22) sensors.
1284  Using Arduino / General Electronics / Re: What do you use for a Li-Po Battery Charger? on: November 13, 2012, 12:24:14 am
For multi-cell batteries (7.4V or greater)the extra wires are used to ensure the charge of each cell is correct. If the wires were not available then the cells could not be charged individually and inevitably one of the cells would get overcharged and other cells would get undercharged.

Temperature probes on RC batteries or chargers aren't at all common.

1285  Using Arduino / LEDs and Multiplexing / Re: Proximity with IR emitter and detector on: November 12, 2012, 11:41:50 am
http://www.arcfn.com/2010/03/detecting-ir-beam-break-with-arduino-ir.html

Be careful and note that your IR receiver is not designed to output a continuous signal; see page 5 of the IR receiver's datasheet and it will show that when it detects a continuous beam it will only show a signal for about .0013 seconds.  You need to turn off/on your IR beam intermittently to keep testing for an object.
1286  Using Arduino / General Electronics / Re: TSOP4838 IR decoder - "Random" noise on: November 12, 2012, 11:32:06 am
Sounds like a decoupling problem. You IR datasheet will suggest a cap and resistor on the IR receiver's lines to reduce noise.
1287  Using Arduino / Project Guidance / Re: ATtiny85 to time & control a relay on: November 12, 2012, 11:29:27 am
An ATTiny will do it fine and is what I'd recommend. You don't even need a crystal if you don't mind being a few seconds off in your timing.
1288  Topics / Interactive Art / Re: [Snake Game] Funny Game Controller on: November 12, 2012, 02:52:29 am


smiley-wink
1289  Community / Bar Sport / Re: What's with the response to Sandy's victims ? on: November 12, 2012, 02:45:21 am
That's $8 billion (which I assume is the value in Australian dollars) for all of the election races. Still way too much though -- couldn't watch a single Youtube video without some damn election commercial.

http://www.opensecrets.org/news/2012/10/2012-election-spending-will-reach-6.html

The "petrol" supplies are being hampered by so much of the fuel delivery infrastructure now being dedicated to providing supplies to the bazillions of generators that are in use. I'd also assume that quite a few service stations were knocked out of service; that's going to put more pressure on those that remain running.

In some situations there are strong labor unions preventing additional help from coming in (New York is very "intense" when it comes to labor unions). Yeah, that sucks.

As for the little old lady being given a blanket and can of beans... you gotta wonder about a person as unprepared as that. That's just not typical. Gas hoarding is not typical but yeah, it happens.
1290  Using Arduino / Motors, Mechanics, and Power / Re: Looking for some help with stepper motor control on: November 12, 2012, 01:35:07 am
You could get a 3.6 degree bipolar motor. I suppose that's cheating but it would be a simple way to double your speed.
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