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511  Using Arduino / Programming Questions / Re: Need help with "speed optimization" on: March 18, 2014, 05:53:14 am
Try a pull down, try a 1k resistor from your input to ground...
512  Community / Bar Sport / Re: digital currency. on: March 18, 2014, 05:16:33 am
I think your LED is missing a resistor.  smiley-wink
i didn't realise LEDs had resistors in them...

About as far off topic...

But, I'm using a 11 watt led driven at 3.8v  pulling around 500ma, on a 50watt heatsink .

Been running it for about 2 weeks .... resistor not required.
513  Using Arduino / Programming Questions / Re: Need help with "speed optimization" on: March 18, 2014, 02:49:18 am
Regarding your circuit, do you have a pull down resistor on both interrupt pins?
514  Community / Bar Sport / Re: teaching debugging on: March 18, 2014, 02:45:26 am
I think I've spent more time debugging than coding, stepping through lines of code... over and over  smiley-sad again
515  Community / Bar Sport / Re: whats with the attitude on: March 18, 2014, 02:39:28 am
Big words upset people the most!

You flamboyant over opinionated discombobulated neanderthal  smiley
516  Using Arduino / General Electronics / Re: Switch 12v power with Arduino and MOSFET on: March 18, 2014, 02:35:33 am
Which is it? Tip41a or tip42g?

Well the tip42g is a power transistor not a fet, this particular pnp transistor relies on current to control your load, a fet relied on voltage.

You're mixing up your transistors.

You're better with an NPN or N-Channel, switching the base/gate to high.
517  Using Arduino / Project Guidance / Re: Controlling 12v 25w Heater on: March 18, 2014, 01:01:40 am
Re-arrange it  so you don't need to invert the signal..

518  Using Arduino / General Electronics / Re: Voltage regulator Batt Capacity Question on: March 17, 2014, 07:17:09 pm
7805

Be a 12v or 9v if they both have the same Amp/hour rating eg 5ah 9v or 5ah 12v the regulator will chew through the same power.
519  Community / Bar Sport / Re: digital currency. on: March 17, 2014, 09:21:13 am
No resistor, still working fantastic soley voltage controlled smiley
520  Community / Bar Sport / digital currency. on: March 17, 2014, 09:08:10 am
If google earth and bitcoin was somehow merged....

People could buy land, your own back garden if you wanted... and mine for resources, how much and the logistics would be that of bitcoin, mine for gold, diamonds, trade....

Add a layer, allow people to buy wood, stone, brick from anyone who is willing to mine it and sell it on as a profit.

So we end up with the ability to mine, and that's all one might do, another extension would be to be a developer and make buisnesses like in second life, except you have to trade for materials from the miners or resellers.

So there's no main "interface" you just add layers, want to sell cars, you write an extension/plugin everyone else can download use, have no 3D interface and just mine in the space you bought...

A virtual economy based on a farhinite resource, once resources begin running out prices go up , the periodic table is there to be mined for people to build with, with the possibility of say real companies buying into the virtual space to offer electric to your homes and houses....
521  Community / Bar Sport / Re: Things to be missed 10 years from now... on: March 17, 2014, 08:53:01 am
In 10 years the ice age will begin to grip the planet....

So you can remenis about days over 40f smiley
522  Using Arduino / Project Guidance / Re: Newbie series LED issue on: March 16, 2014, 10:28:13 pm
I' ve never heard of someone connecting led's in series. Where did you get the idea to do that ? (what nade you think it would work?)

Surely you have, take any LED strip which takes 12v, or do you mean from an arduino pin?
523  Using Arduino / Project Guidance / Re: Newbie series LED issue on: March 16, 2014, 08:38:46 pm
Can I see the circuit? A picture .. or draw a schematic. .. hard to visualize what you've already done
524  Using Arduino / Project Guidance / Re: nRF24L01 Help! on: March 16, 2014, 08:33:09 pm
When you hear an ambulance's siren in the distance, the frequency changes  as it moves closer/further away right..

With packet data nothing changes except the time for the packet to arrive, how exactly would you perform dopler?
525  Using Arduino / Project Guidance / Re: Controlling 12v 25w Heater on: March 16, 2014, 08:25:49 pm
Quote
 2n222  
=>2N2222
SEE ATTACHED.
I guess that means the heatsink is anywhere but on the TIP120 ?

Quote
The emitter on the 2n222 is connected to +5 rail. The collector is connected to the base of the TIP120. This configuration does work.  
The emitter on the 2n222 is connected to +5 rail. (damn! , now you got me doing it...)
The emitter on the 2n2222 is connected to +5 rail.
The collector is connected to the base of the TIP120
 I think you better look at the datasheet. The only way it could be working is if the COLLECTOR is connected to +5V and the EMITTER is connected to the base of the TIP120.
FYI,, It is really not a good idea to omit the current limiting resistor on the base of the transistor. It is going to get very cross with you . It's probably already pissed off for you not putting a heatsink on.


How often do you get into arguments with electronic components? smiley
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