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871  Using Arduino / LEDs and Multiplexing / Re: Are Resistors Mandatory? on: August 03, 2013, 10:53:39 am
One solution would be to connect the pin to a transistor via a 1k resistor then you need not worry about current draw at all... using pwm to the base pin will allow analogWrite to work...

Maybe you could sketch that out?
872  Using Arduino / Programming Questions / Re: Two Potentiometer Arduino to xbee to xbee to Arduino to two Led's on: August 02, 2013, 08:44:12 pm
Ben?
BenBen?
BenBenBen?

Hola.
Que tal?
873  Using Arduino / Project Guidance / Re: How to Radar Sweep 13 arrays of LEDs with Fade (PWM) Mega2560 on: August 02, 2013, 08:12:51 pm
OK, Great.
I saw this at work but the site was down or something, probably their bad, but it in the meantime you saw the light.
You're real-time, now, and that's a good thing.
[If I wrote it with digitalWrites then it would be "transportable", but it wouldn't work so hot as there's a lot of code-overhead with that that bogs things down.]
It's definitely Pro-Mini compatible, but some adjustments to Mega are needed (which you've grasped.)

OK... Right On.
Keep us all appraised of your progress, and if you make improvements please post same.
874  Using Arduino / General Electronics / Re: Desoldering components? on: August 01, 2013, 08:52:14 pm
Treated wick ("soder-wick", tech spray, and so on) looks tarnished, but it's not.
My method is just laying atop the area to desolder from, touching the iron to it; the solder starts travelling up the strands, remove it and the heat, cut of the solder-filled part and go along.

I'm not certain which component you're trying to remove there, but it's possible that by touching each joint, "circularly" (touch, touch, touch,...) that you can pluck it off with the tweezers while everything is molten / semi-molten..

All easier done than to express verbally perhaps.
875  Using Arduino / Programming Questions / Re: Two Potentiometer Arduino to xbee to xbee to Arduino to two Led's on: August 01, 2013, 08:32:40 pm
I guess 254 (oxfe) is your header for sensor1 and 255 (0xff) is for sensor2?
(Reliable?)
If you send 254 (0xfe) followed by sensor1 data then sensor2 data then...

Code:
void loop()
{
  if (Serial.available() > 0)
  {  
    incomingByte = Serial.read();
    if (incomingByte == 254)
    {
      sensor1 = Serial.read();
      sensor2 = Serial.read();
      Serial.print("S1 = ");
      Serial.println(sensor1,DEC);
      Serial.print("S2 = ");
      Serial.println(sensor2,DEC);
      analogWrite (10, sensor1);
      analogWrite (11, sensor2);
    }
  }
}
I wish I could look this up and read on how to fix my problem,  So I would stop asking on here.  
There is plenty to read and take advantage of, but what there is doesn't match your needs point-for-point; it's presented as concepts you have to integrate and apply to your situation, as I'm likely doing imperfectly.
[Where's the conversation?]
876  Using Arduino / Programming Questions / Re: Two Potentiometer Arduino to xbee to xbee to Arduino to two Led's on: July 31, 2013, 09:23:33 pm
I had 77 people look at my Forum,  and only two of them people could kind of help me. 
Or maybe you people don't know......

I don't know, maybe I shouldn't jump in, but how does the receiver "know" whether the data it gets is for 'sensor1' or 'sensor2', or doesn't that matter?  A byte is a byte; well, here's a byte, I guess - go for it.
Did you want to have a conversation or did you just want to get this thing done, over with?

Anyway, wouldn't a "header" set things up like?

With GPS, a receiver sketch waits for a particular sentence's header; so cued, it then buffers and can intelligently parse (work with) the data accordingly.
877  Using Arduino / Project Guidance / Re: How to Radar Sweep 13 arrays of LEDs with Fade (PMW) Mega2560 on: July 31, 2013, 08:02:42 pm
I've done what you're trying to do, even if it takes a different form.
It uses Port Manipulation though I'm not sure how the Duemil/Uno "translates" to Mega that way.

http://forum.arduino.cc/index.php?PHPSESSID=akbdk212mmlb8hm2chn2hisn35&topic=171567.0
878  Using Arduino / LEDs and Multiplexing / Re: Do I need a resistor for each LED? on: July 31, 2013, 08:13:25 am

Most modern DMM have both separate resistor shunt(s) and separate fuse(s) for typically the two different current jacks.

Lefty

I have two of the same Fluke (70-series) meter.  I cleared the fuse in one of them (the mA) and replaced it with an "equivalent" rated fuse.  Then the readings were off.  I swapped the fuse with the other which still had its original and it was better.  I placed the "equiv" in the other meter and then it was off.

879  Using Arduino / General Electronics / Re: switching LED on detecting IR on: July 31, 2013, 07:38:42 am
If you place the LED and its series resistor (1KΩ) between +V and the detector's output pin then the LED will turn on (flicker) when IR signals are present.
880  Using Arduino / LEDs and Multiplexing / Re: Do I need a resistor for each LED? on: July 30, 2013, 07:35:26 pm
Odd that, I thought that was exactly how a multimeter is wired inside for measuring current.

Mike,
Is it an actual "shunt" or is it the fuse?
881  Using Arduino / General Electronics / Re: Should I get this wick? on: July 29, 2013, 09:48:52 pm
It's a good brand.

That particular brand is very good.
882  Using Arduino / General Electronics / Re: Should I get this wick? on: July 29, 2013, 09:41:31 pm
That particular brand is very good.
883  Using Arduino / General Electronics / Re: Should I get this wick? on: July 29, 2013, 09:40:16 pm
It can be useful.  There's a kind of art to that.
Sometimes I use wick, sometimes I use a "sold-a-pult" (a/k/a a "solder sucker")
884  Using Arduino / General Electronics / Re: Should I get this wick? on: July 29, 2013, 09:36:26 pm
rubbing alcohol and Q-Tips
885  Community / Bar Sport / Re: Myth - ALL LED'S require Resistors or.... on: July 29, 2013, 06:49:50 pm
So then, not all LED's need resistors (key word resistor) we all agree that's true then?

What is your point (keyword point)?

The current through any LED must be limited, by whichever means appropriate.

> > >
It's like what James posted earlier,
Whatever you claim.  I rarely see people recommending a current limiting resistor in this case.  You still need a current limitor, e.g. constant current supply.  Which is usually when the distinction is made between using just a resistor.

Just trying to twist wise words into a trap for fools for lack of anything better to do?

It's a real tempest in a straw-man's teapot this.
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