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31  Using Arduino / Motors, Mechanics, and Power / Re: H-bridge on: August 13, 2014, 09:07:20 pm
14.8-12 = 2.8 --> 2.8x5A =14W, a heatsinked regulator should be able to handle that.

Simple that, eh?
Is there a circulating coolant used?

I think you're going to have to come up with a battery better suited to your motor - or a motor better suited to your battery.
32  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 12, 2014, 09:59:14 pm
Quote
Tubes (the triode) were invented in America by an American.
No argument, I guess he spoke American then.

He didn't see any need to write to a housewife in Kent, or Munich, to ask what he should call his invention.

So if the ancestry is important there are no Americans in America apart from the Native Americans. And even they came from some place else.

They didn't call themselves "Americans" either.

There are a few curmudgeonly displaced Picts who fulminate about the Angles' and Saxons' usurpations, and they the Normans'.
The Angles' "homeland" is, afterall, in Germany.

The mantle has been passed, Mike, a long time ago.
Whether some of you guys can get that isn't my problem.
33  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 12, 2014, 09:18:31 pm
Odd I thought we spoke English in England, the clue is in the name.  smiley

Tubes (the triode) were invented in America by an American.

BTW, the Queen is a German! 
34  Using Arduino / Motors, Mechanics, and Power / Re: H-bridge on: August 12, 2014, 08:44:18 pm
but the proper way is to regulate. I'm going to have to heat sink the smitten out of a LM1084 (12V 5A) just to barely keep it in spec should a motor stall happen.

Proper : regulate : motor supply?  I disagree.
Anyway.
Don't worry about peak charge so much.
When the motor starts to do any work the battery will load down.
If a motor stall occurs then the deal is nothing but coil resistance (wire) - that'll load down your battery good.
35  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 12, 2014, 08:31:31 pm
Quote
vacuum tubes
They were called "valves" in English.

They were called "valves" in England.
36  Using Arduino / Programming Questions / Re: If sensor is on for a certain duration, then do this? on: August 10, 2014, 08:24:56 pm
If you don't want to see the answer then skip the following:

Code:
//  pirtrippoint5sec
//
//  wait for 5 seconds
//  of constant detection
//  ** works  07APR2014 **

unsigned long refTime;
unsigned long trippoint;

const long threshold = 5000;

byte DET;
const byte pirPin = 8;
const byte ledPin = 13;

void setup ()
{
  //pirPin is INPUT by default, use ExtPullup
  pinMode (ledPin,OUTPUT);
  digitalWrite (ledPin,LOW);
}

void loop ()
{
  DET = digitalRead(pirPin);
  if (DET == 1)  // inactive
  {
    refTime = millis();
    trippoint = refTime;
  }
  else   // Active Low
  {
    pir_active();
  }
}

void pir_active ()
{
  trippoint = millis();
  if ((trippoint-refTime) > threshold)
  {
    digitalWrite(ledPin,HIGH);
  }
}
37  Using Arduino / Project Guidance / Re: Help me with a Bluetooth project! (please ) on: August 10, 2014, 01:05:07 pm
When a character (a number, a letter, a value) is sent, it's sent as a byte.

Anyway, in re. your posted sketch, does the LED turn off, too?
[From what's there I think that it can be turned on but not off.]
38  Using Arduino / General Electronics / Re: Novice question re pin connections to Arduino on: August 10, 2014, 11:16:25 am
          For connections to the perfboard, I would probably use Molex KK-type connectors.  However, this system generally is designed to have male pins on the board and a female connector on the wires.  Thus, it will not work for making connections to the Arduino board, which has female sockets for all of its external connections. 

http://www.digikey.com/product-detail/en/0016020115/WM2515-ND/171959
39  Using Arduino / Project Guidance / Re: Help me with a Bluetooth project! (please ) on: August 09, 2014, 09:57:26 pm
You're sending/getting 'state' and turning on LED1 based on that (but how does it turn off?)
By the same token, you need to send, say, "state2"
So, definitely implement a contingency for "state2".
Send a control byte followed by a state byte("S1", 0 - LED1  off; "S2", 1 - LED on, etc).

Later, maybe you could combine everything as one byte, send that, and then mask off the bits to determine what action to take then?
40  Topics / Robotics / Re: Problems with Parallax Continuous servo sketch not working correctly on: August 03, 2014, 10:16:50 pm
Right.
For positioning - use a "standard" servo.
41  Using Arduino / Project Guidance / Re: read pot help wanted on: August 03, 2014, 10:08:41 pm
Wouldn't a non-linear pot still give analog 0 at one end and and 1023 at the other though, but just not be linear between the extremes? Surely the ends are the same no matter what the pathway? (Not that I've ever used one, just seems sensible to me.)

Yes.
 (And, they're known as "log" or "audio" taper.)
-----------

Maybe the wires aren't making good contact in that header?

What value is the pot? 
The analog inputs are not "High Z" inputs (they're not op-amp inputs), more like middling , so you don't want a high-value pot.
42  Using Arduino / Microcontrollers / Re: Need help with arduino on perfboard on: August 03, 2014, 07:47:57 pm
the voltage on the + rail on the breadboard is around 3 volts, while I'm inputting around 5.14 volts. Ill attach a picture of the setup.

Any ideas why it isn't turning on and why the voltage on the power rails is so much lower than the input?

Yes - there's not enough input voltage.  You will have to feed it at least 8V.
Don't connect anything  else till you get that right.

(Also, black wires should be "reserved" for connections to Gnd - it's an "unwritten rule".)
43  Using Arduino / Microcontrollers / Re: Arduino as ISP Doesnt work. on: August 03, 2014, 04:03:04 pm
sorry but i dont understand english

That's a relief - I thought that it was me.
44  Using Arduino / Microcontrollers / Re: Need help with arduino on perfboard on: August 03, 2014, 04:01:46 pm
Having 0.1uF caps on VCC, AVCC, and Aref (connect the cap from Aref to Gnd, do not connect Aref to +5V) will provide for more stable operation.
Use a 4th 0.1uF to create Reset from the DTR output of an FTDI Basic for serail programming.
I followed the picture I posted from the tutorial I used for the basis of the design (http://www.freetronics.com/pages/tutorial-build-your-own-breadboard-arduino#.U95KhvldV8H) and then added the caps you suggested to VCC and Aref instead of the jumpers as you suggested.
But the tutorial ddin't do anything with AVCC.  What is it used for and what should I do with it?  Where should the cap I'm connecting to it end?

You need the caps in additon to the jumpers, not in lieu thereof.
45  Using Arduino / Microcontrollers / Re: Arduino as ISP Doesnt work. on: August 03, 2014, 12:54:31 pm
Nobody reckons the difference between the "expected signature" and what's been reported as significant?
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