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526  Using Arduino / Project Guidance / Re: Amplifying Millivolts To Volts on: February 18, 2014, 07:00:16 pm
Keith, you'd need an antenna the size of a house to be able to charge your phone lol
527  Using Arduino / Project Guidance / Re: Arduino Uno running in a car on: February 18, 2014, 06:58:44 pm
That's a little overkill.... but yeah that would work fine...

Any voltage spikes would be dissipated via the regulator, the caps filter both sides of the wave form, a flyback diode/ scotschy you have is it needed? Unless you expect some inductive voltages?

I've run sensitive electronics on a lot less lol, I once used a zener 12v and it worked flawlessly for many years monitoring the car battery voltage from a bargraph ic.

528  Using Arduino / Project Guidance / Re: Amplifying Millivolts To Volts on: February 18, 2014, 06:51:23 pm
I'm getting 10mv from RF in the air all I'm trying to do with it is convert it high enough that I can use It for something (charge a phone). I've got a whole bunch of electrical parts. I have about a couple of differen types of op amps and I don't really have to worry about anything else because I pretty much have it all.

10mv.... unless you're also getting considerable current (which you're not) to step up with....


Just give up lol


529  Using Arduino / General Electronics / Re: voltage regulation for LED's (Train) on: February 18, 2014, 06:44:12 pm

Lighting up a LED correctly isn't as easy as it seems.


it is.

So why are there hundreds of special ICs to do it?



If you used a 1k resistor it would be safe to use on any voltage that one can touch with your own hands...

So why require more?  Simples - to regulate the brightness... lighting one up is childs play
530  Using Arduino / General Electronics / Re: voltage regulation for LED's (Train) on: February 18, 2014, 07:10:21 am

Lighting up a LED correctly isn't as easy as it seems.


it is.
531  Using Arduino / General Electronics / Re: flash circuit on: February 18, 2014, 02:54:31 am
Why bother..


Two 3watt leds or 1 10watt would give the same light and last longer as well as not expose you to high voltages to power the cfl.
532  Using Arduino / General Electronics / Re: voltage regulation for LED's (Train) on: February 18, 2014, 02:49:59 am
You need to know what voltage is being supplied, if it's a constant voltage it's sinply a case of using a resistor...

Tricky part will be reversing, if it's minus voltage, then it's as simple as flipping the led with a resistor.
533  Using Arduino / Programming Questions / Re: Bubble Sort and In-Place Sort on: February 18, 2014, 02:39:54 am
There are faster sorts.....

What's the question?
534  Using Arduino / LEDs and Multiplexing / Re: Reading and logging solar panel energy with Arduino on: February 17, 2014, 08:28:23 am
By energy, you mean watts? or do you mean Voltage?.

Voltage would be simple enough, in order to measure power/watts you'd need a shunt resistor and measure the voltage drop.

535  Using Arduino / LEDs and Multiplexing / Re: Cheapest way to have a bright flash? on: February 17, 2014, 08:25:26 am
The ultimate method would be to design a small circuit to fire off a xenon flash (old disposable cameras), using a transformer to step up and charge a capacitor (200vdc+), and then fire it off as a bright very bright flash of light.

Failing that, a 10watt white LED along with a 12v battery would be more than capable of getting your attention even on a sunny day (which the 5mm/10mm LED's wont really do)

536  Using Arduino / Microcontrollers / Re: Arduino as ISP Programmer, but using different pins on: February 17, 2014, 07:20:40 am
For me, extra strain .... means anything that's less efficient than a hardware way, if all the pins are assigned by the bootloader and MISO, MOSI, clock, data, if all of it is simply firmware bit-banging at the core..

then fine, there's probably no extra strain at all, but even if it means using 1 byte more of memory or having to do 1 more clock cycle because it's less efficient due to work around or other problems you encounter..

it's extra strain, if you were made to count out 32 carrots a day and then it went up to 33... that's an extra 365 carrots a year.

if you're going to attack what i said, then at least explain how hardware pins work and why it's *no* extra strain instead of childish name calling.
537  Using Arduino / Microcontrollers / Re: Arduino as ISP Programmer, but using different pins on: February 17, 2014, 05:03:52 am
Quote
That's baloney cjdelphi. It just runs slower to bit bang versus using dedicated hardware.
That's like saying shiftOut() is more strain vs SPI.transfer(). Just slower is all.

"Strain" for a computer system is anything that reduces free-cpu cycles or reduces the shared memory pool; that is, anything that makes the CPU less efficient.  I rarely use the word "strain" for a dedicated uC since it is more commonly used for systems, but I see no particular wrong usage.

I used to request "stress testing" on UNIX systems used for middleware; standardized software testing for new hardware or new hardware configurations.


Ray

Looks like you're the only one here not jumping on the be a bully bandwagon. .. an indeed anything that places more work on a cpu when there's a less cpu consuming way.

Abusive members!
538  Using Arduino / Microcontrollers / Re: Arduino as ISP Programmer, but using different pins on: February 16, 2014, 07:53:08 pm
If you require code to do something that already exists at a hardware level..

Eg send/recv serial pins 0/1, the alternative is generally a slower bit-banging alternative... are you saying there are no hardware pins/ports, and all pins behave identically as it's all software driven by firmware?

539  Using Arduino / Microcontrollers / Re: Arduino as ISP Programmer, but using different pins on: February 16, 2014, 06:03:38 pm
It will add extra strain on the cpu having to bit-bang rather than relying on hardware.
540  Using Arduino / Microcontrollers / Re: Arduino as ISP Programmer, but using different pins on: February 15, 2014, 11:08:00 pm
As far as I'm aware, they're hardware pins like 0/1 or scl/sda etc.
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