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1  Using Arduino / General Electronics / Re: Looking for the right switch on: Today at 09:05:07 am
reed switch?
2  Using Arduino / Microcontrollers / Re: Cheap Chinese clone: Programmer not responding on: Today at 06:33:47 am
God. Let this be a lesson: Always buy official products and not chinese trash. It is not worth it.

I use cheap Chinese FTDI programmers all the time, I never had  a problem.

(Yours looks like a standard FTDI chip, I can't imagine how they could mess it up).

3  Using Arduino / General Electronics / Re: Lesson Learned on Vishay VO14624 Solid State Relay on: Today at 04:14:35 am
I tested the relay by applying 5 v. to the control pin.  The ProMini was not yet on the board, so I couldn't test it from the ProMini.  Well, that burned out the relay. 

So with further experimentation, I discovered that that UV diode in the relay is not protected by any internal current limiting.  If I had read the data sheet very carefully, I may have deduced that, but is not stated in the data sheet. 

This is true of most (all?) optoisolators.

Inside the chip it's just a LED. The same rules apply to LEDs inside optoisolators as any other LED.

They can't really add a resistor because they don't know what voltage you're going to use to drive it.
4  Using Arduino / LEDs and Multiplexing / Re: Using pots to control rgb values of an rgb strip? on: September 16, 2014, 01:10:44 pm
Not really related to arduino on anyway other than now that I bought a ten pack of potentiometers and only needed 3, I'm wondering of I have a 12v strip, can a connect a potentiometer to each of the RGB strips r, g, and b pins to dim the color values so I can select the color that way?

No.

You can connect them to an Arduino and get the Arduino to control the strip but you can't use them directly.
5  Using Arduino / Microcontrollers / Re: Cheap Chinese clone: Programmer not responding on: September 16, 2014, 01:07:26 pm
Well... It actually looks like some of the pins on the FTDI board and the Pro Mini doesn't line up - this can also be seen on the Pictures.. I just looked on the official parts from Sparkfun and the connecters are exactly the same.. The way I connect it up can be seen here.

Riiiiight....but have you actually looked at the labels on the boards. 50% of Pro Minis need to be flipped over when you plug them in. The pin to look for is Vcc.

6  Using Arduino / Microcontrollers / Re: Problems with setting up a cloned Arduino board. on: September 16, 2014, 08:13:58 am
... which by the way should be big enough for storing a unsigned int array[350].  smiley-slim

Sure,  if that's the only thing in RAM.

But I bet it isn't.

https://learn.adafruit.com/memories-of-an-arduino/measuring-free-memory
7  Using Arduino / Microcontrollers / Re: Cheap Chinese clone: Programmer not responding on: September 16, 2014, 08:01:26 am
Are you sure you connected it properly? Pro Minis can be connected either way up. Look carefully at the markings on the boards to make sure Vcc goes to Vcc.

Quote
I managed to upload the blink sketch to the board. I got the onboard LED blinking


Are you sure about that? They generally come with "blink" already loaded.

8  Using Arduino / General Electronics / Re: TLC5916 questions on: September 16, 2014, 07:55:12 am
This device seems similar to the TLC5940.

Nope, it's nothing like it.
9  Using Arduino / LEDs and Multiplexing / Re: LED drivers on: September 16, 2014, 03:48:38 am
...the neopixel just didn't have the mcd I was looking for.

The first thing we might need to know is exactly how much you need...

10  Using Arduino / LEDs and Multiplexing / Re: LED drivers on: September 16, 2014, 03:44:01 am
Correct, I think the latest release are WS2812b. pretty much the same thing I believe as 2811, just a little better speed.

Nope. Speed and capabilities are exactly the same.

The difference is the LEDs have less external pins (4 instead of 6) so they're cheaper to manufacture.
11  Using Arduino / General Electronics / Re: TLC5916 questions on: September 16, 2014, 03:37:23 am
I'd also like to learn how to drive them, as opposed to hooking them up and having a library do all the work for me.

Start with the library, get the circuit working.

Then ... remove the library.
12  Using Arduino / General Electronics / Re: Stepup converter making squeaking noise on: September 16, 2014, 01:53:37 am
The converter is rated for 2A output, so it should have no problems running those two fans. But, why the squeaking noise? Is it normal on those circuits, or is it a sign that I'm pushing it past its limits?

Is it getting hot?

The next step is to look out power (volts x amps) on input and output. See how much efficiency you're getting.

13  Using Arduino / Microcontrollers / Re: arduino uno dead? on: September 15, 2014, 01:42:38 pm
I suspect the part where you say "the relay board was connected properly" isn't true.

(How did you connect it, exactly?)
14  Using Arduino / LEDs and Multiplexing / Re: QTouch IC (Pic Heavy) on: September 15, 2014, 01:25:27 pm
Does anyone know anything about QTouch IC like these???
They are Atmel QTouch IC AT42QT1012

There's a company called Atmel that knows quite a lot about chips like that one.

I think they even provide downloadable files called "datasheets" with information.

15  Using Arduino / General Electronics / Re: Measuring battery voltage to Arduino on: September 15, 2014, 10:11:28 am
This might be a stupid question, but this planned setup won't pull down the 9v current on the main power line that goes to the Arduino's barrel jack?

Yes, it will !!!

(But only by about 2% of what the Arduino will pull it down - see reply #1).

PS: If your "9V battery" is one of those square PP9 batteries then prepare to be very disappointed by how long it lasts.

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