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1  Using Arduino / Programming Questions / Re: Turning on multiple relays with space bar on: September 20, 2014, 08:06:58 pm
Set up your Serial.read arrangement for a two-digit input (01, 02, 03,... 10, 11, ...)
2  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 20, 2014, 08:03:58 pm
This is the Subject:
I have to use the BDV66B and BVD67B.

Oh know (sic) you got distracted, something tells me know (sic) ones going to care about that. Was all that pointless ranting my fault?  smiley-sad
Giving alternate h-bridge designs when talking about h-bridges seems fine.

The objective is clear to me.
But instead of sticking to the OP's issue, hijackers want to lead off into the ditch.
What's with the compulsion to hijack and side-track, especially this h-bridge stuff? It must be a fear that somebody will get something accomplished.
When you get that circuit of yours going - start a subject on it.

Other points:
  • It's my circuit, I posted it (sans resistor values - seeking to cue the OP for a response - tis Madness!).
    I can attest to its viability.  It's performance is less than stellar, but Doglingtons are Doglingtons.
  • The resistors that you describe as "extra" pull the inputs down (OFF) so none is left floating if disconnected.
  • I already advised the OP take an incremental approach to the build.  It was ignored, c'est la vie.

I suggest that you try the motor with the NPN-doglington, see if you can get that simple circuit hopping.
Then you should try the motor with the PNP-doglington with its NPN driver, simply verifying the high-side switching.
Then you should integrate the two together.

Somebody linked to a previous h-bridge "discussion" where that deal cratered owing to the ensuing hijacking there, too.
3  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 20, 2014, 01:55:29 pm
I don't think suggesting he clean up his schematic before posting it is a distraction considering how distracting the crossed out sections of the schematic are. Liquid paper is a perfect way to do that so it is very appropriate. I don't know why that is so hard for you to understand.

Oh, get off it.
You didn't suggest anything verbally: like a wiseguy you posted a link to a google search for "Liquid Paper".
If you're so concerned about it then send the poster a PM about it.
Just stop it already!

That circuit is irrelevant to this subject and your "missive" is spurious, too.
4  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 20, 2014, 01:15:11 pm
Might as well tag along, here is my newest try of a h-bridge.

This is the brand I use. I keep one at home, one at work , and one in my car.

Those are both intrusions.
The subject is about this guy's Doglington transistors, everything else is a distraction.

I tried using the circuit.(see attachment). I cant get the motor working. I use a voltmeter and placed it on the motor and I get 1.7V only.

Whatever that's supposed to mean.
Nice try, anyway, pal.
You tried it and it didn't "work"? 
Two can play that game: Well, I guess that you did something wrong.
(I'd wonder what resistor values you're using, but I find it difficult to give a fig at this point.)
I think that you're playing some kind of game.
5  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 19, 2014, 07:44:55 pm
Can i use pn2222 on Q1 on/off and Q3 on/off?

Short answer: Yes.

I suggest that you try the motor with the NPN-doglington, see if you can get that simple circuit hopping.
Then you should try the motor with the PNP-doglington with its NPN driver, simply verifying the high-side switching.
Then you should integrate the two together.
Why aren't you participating?
I need to see some application.
 
Anyway, I hate for lurkers to see this and get ideas.
(NB, Lurkers: Bad Idea.)
All power Doglington transistors should be crushed and placed in landfill (saving a few as museum pieces.)
6  Using Arduino / Project Guidance / Re: LEDs say yes, but Input pins say nothing, or too many things?! on: September 19, 2014, 07:34:01 pm
The 100ohm resistor brought the Phototransistor output up to 4.1V, amazing!!!

Good that.

prefers one of the grounds and stays low all of the time, or otherwise jumps around from low to high (floating).

I don't understand this part at all.
Is there a separate 5V supply?  If so, then its Ground should be connected to Arduino Gnd, too.
7  Using Arduino / Project Guidance / Re: LEDs say yes, but Input pins say nothing, or too many things?! on: September 18, 2014, 10:58:14 pm
- no matter where i plug in the 2.4V Phototransistor output, I can't get the input pin to read it.

I think that that 2.4V isn't really a valid High. (Is it? Try it with a pot or a couple of resistors.)

You have 220Ω in series with your IR emitter.  IREDs can run more current than LEDs, lots more (typ.)
I think you could do with more current, which would result better opto transfer. 
This arrangement is like a photo-dependent emitter follower - pretty shaky.
Try 100Ω (appx 40mA)

So, increase IRED output and check for more opto out voltage.
[Or see if there's something similar without a shared collector, so that they can be pulled high.]
8  Using Arduino / Motors, Mechanics, and Power / Re: Electric Braking a scooter motor... on: September 17, 2014, 06:53:59 am
Right, right.
I was getting the read that our friend here is figuring on "injecting" a reverse current to counteract or other.
9  Using Arduino / General Electronics / Re: 4051 + MOSFET troubles. on: September 16, 2014, 07:15:34 pm
Keep in mind that the 4051 has a pretty high (Z to Y) resistance with a 5V arangement.

Do you have the Select lines, 9, 10, and 11 at Gnd.?

I may be wrong,  but I think that the Gate should go to 3, and 13 should get connected to the input (in this case, +5)
10  Using Arduino / Motors, Mechanics, and Power / Re: Electric Braking a scooter motor... on: September 16, 2014, 07:07:50 pm
Is this about a brushed motor?

It probably shows that I'm not The Motor Maven, but isn't the motor voltage supposed to be disengaged and then a (variable) low resistance placed across the windings (terminals)?

If the scooter coasting keeps the motor spindle turning then - it's a generator (yes?).

> > > I've only ever done with a free-wheel so, I'm more asking than pronouncing.
11  Using Arduino / LEDs and Multiplexing / Re: QTouch IC (Pic Heavy) on: September 15, 2014, 09:57:16 pm
It works like a switch, depending how it's configured.

http://www.atmel.com/Images/Atmel-9543-AT42-QTouch-BSW-AT42QT1012_Datasheet.pdf

Lots of informaton, if you try looking around a little.

> > > And, basically, this is neither LEDs nor Multiplexing.
12  Using Arduino / Motors, Mechanics, and Power / Re: can't find the right motor pulley on: September 15, 2014, 09:05:01 pm
Here's another  source.
http://robotcombat.com/products/timing_pulleys_belts_main.html
They're a good company.
13  Using Arduino / General Electronics / Re: 4051 + MOSFET troubles. on: September 15, 2014, 08:32:47 pm
An "MOSFET"?
Which?
Something in a IRF-5useless?

Something less than 1MΩ on that "pull down" - much less than - like 5kto10kΩ.
(That won't help with an IRF-5useless though.)
14  Using Arduino / Sensors / Re: Not able to read pushbutton on rotary encoder on: September 14, 2014, 03:54:50 pm
I think that you need to get out the ohmmeter and find out which terminals are the pushbutton's ("this is what's meant when somebody says, "Pin it out.")
15  Using Arduino / Sensors / Re: Received IR signal is never the same on: September 14, 2014, 03:51:14 pm
http://www.analysir.com/blog/2014/03/19/air-conditioners-problems-recording-long-infrared-remote-control-signals-arduino/
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