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166  Using Arduino / Sensors / Re: Analog reading whats not there on: July 10, 2014, 10:41:24 am
That's also normal...  you need to supply 5v exactly or there will be error...

So the easiest method is to change thd code from 5v / 1024 to what you actually have it might be 4.7v or 4.8v etc but when you use a multimeter to find out use that voltage instead of 5v
167  Using Arduino / Sensors / Re: Analog reading whats not there on: July 10, 2014, 09:57:21 am
Well the reason the voltage  is in flux is simply due to lack of pull down resistor (10k from a0 to gnd)

Your leds... need to see your circuit/code.
168  Using Arduino / General Electronics / Re: "a quasi resonant inverter" on: July 10, 2014, 09:35:21 am
I have ltspice and another high end circuit emulator which does everything...

Everycircuit is no where near complete granted... but (except the desktop) what makes this so good is the speed in which you can create the circuit and then test it, and I'm some what of a purist for example I'd rather use a transistor rather than use a NOT logic gate and this is why I prefer it.

Eye candy sure but what makes it great is the speed in which you can design and test it, the eye candy helps in understanding the flow current.
169  Community / Products and Services / Re: Anyone who knows about this Arduino clone... on: July 10, 2014, 01:52:29 am
The 2 header pins are labeled L and H ...

Are they simply 2 buttons you can use in your program..  giving a logic high or low?  Curious design..
170  Community / Products and Services / Re: Shameless ad for EveryCircuit. on: July 10, 2014, 01:35:07 am
The free version is lol....
171  Using Arduino / General Electronics / Re: "a quasi resonant inverter" on: July 09, 2014, 07:34:51 pm
The capacitor is incorrectly shown as polar.

There are no non polarized to select from in thus emu.
172  Using Arduino / General Electronics / Re: Question, wire as a variable resistor on: July 09, 2014, 11:19:28 am
Um...

What you did was a short circuit with tinned wire as there is little resistance, if there was electronics would be in trouble finding material good enough to conduct electrons.

Nichrome certainly, run a length of wire from the bottom of your room to the top, positive one end and gnd the other end, now take a 3rd wire (regular tinned wire)... insert tinned wire  into a0 on your arduino, now simply connect the tinned wire to any point of the nichrome wire, run it up and down and you'll see a value between 0 - 1024 or 0 to 5v

Depending on how many ohms per meter you may need a few inches or a few feet.
173  Using Arduino / General Electronics / Re: 12V relay not cooperating on: July 09, 2014, 05:57:51 am
The page says 0- 4v which I read yesterday... today I looked at the circuitboard


From memory I remembered 4v ... since everyone was talking about triggering an npn, so well done you got me on my memory! Congratulations. Where were you yesterday with your obvious answer
174  Using Arduino / General Electronics / Re: 12V relay not cooperating on: July 09, 2014, 03:57:06 am
Scandalous!
175  Using Arduino / Sensors / Re: MMA7361 SimpleAsHell on: July 09, 2014, 02:24:12 am
Buyincoins had it down for a couple of bucks, who pocketed the rest lol
176  Community / Products and Services / Shameless ad for EveryCircuit. on: July 09, 2014, 12:14:53 am
http://www.everycircuit.com/app/

Runs on ios, android, chrome.....  allows you to emulate circuits and adjust them without the need to stop the circuit, the scope is handy too...

All your circuits are automatically stored to the cloud (if you register an accoint) if you set it to public you can share with others.


I'm shamelessly promoting because it's a great tool, knock out a circuit while on the bus! And then share it with others who can then view it and modify the circuit and save as there own.

Oh and it would be nice to see more members!
177  Using Arduino / General Electronics / Re: PNP's are they Arduino friendly? on: July 09, 2014, 12:06:29 am
It is easier and would/do as usual and use an npn in my circuit....

See in the attachment, the zener seems to do the job...   (if desperate) but a diode failed (from digital pin out > anode to it's cathode then to the base pin via the resistor)
178  Using Arduino / General Electronics / Re: PNP's are they Arduino friendly? on: July 08, 2014, 11:42:27 pm
A zener or regular diode should protect the arduino if you have nothing except a pnp and 6v or higher voltage source...

Of course this would not happen, but I like to know these small details.
179  Using Arduino / General Electronics / Re: 12V relay not cooperating on: July 08, 2014, 09:05:37 pm
I decided to take a closer look at the image...

The 2 transistors used are S8550.   Pnp!

To activate the relay pull it to ground (not supply 3-4v) like the webpage states, place a diode in series and signal 0v to switch it on... switching it off may be an issue as it may require up to around the 12vcc input you use.
180  Using Arduino / General Electronics / Re: LM2575 7.4V to 5V (i don't understand the circuit diagram) on: July 08, 2014, 08:53:29 pm
There is a certain satisfaction that comes from DIY Projects especially in the face of all the nay-sayers; there is also great potential to destroy your phone, burn your house down, and die a fiery death.  Tread carefully. The benefit of building the circuit yourself is that you not limited to  a set form factor and you can add it to a PCB design. In this case, it probably would have been easier to go with a manufactured part.  Live and Learn.

 smiley-roll

Destroy your phone... sure if you don't select 5v ... burn the house down? From a usb charger?  Seems a stretch of the imagination unless he/she creates a 240v charger themselves.

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