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661  Using Arduino / Project Guidance / Re: TimeLord? on: January 03, 2014, 07:13:56 am
Unless it's cloudy a LDR would do the job accurately.

(If you wished to avoid  this library)
662  Using Arduino / General Electronics / Re: Using hot glue gun to hold components together? on: January 02, 2014, 08:47:10 pm
The glue may go back to a liquid stage...

It really depends on how much current you drawing...
663  Community / Bar Sport / Re: whats with the attitude on: January 01, 2014, 02:22:58 am
Thinking about it, why not analyze the entire post and check for abusive language and red flag it.....

As for Coding Badly, he like Steve are just grumpy seen it all been there got the tshirt and help more grudgingly than to be genuine/helpfull....

I'm nice to everyone until they give me reason not to be, plenty here refuse to be nice to people unless they posses power/skill ehatever it may be, that they themselves do not possess. .. I treat all as equal and I'll gladly challenge anyones behaviour I have no interest in crawling or becoming a moderator no interest at all, I will help anyone I can and when people like mr grumpy attacks you for not knowing something or getting it wrong... ok fine I'm sorry for putting effort into understanding and trying to help...

Great someone who knows does! Now I know too.... shame about the verbal abuse given for trying to help, pointing it out is fine but why am I being chastised for it?.. ego trip?
664  Community / Bar Sport / Re: whats with the attitude on: January 01, 2014, 02:03:15 am
When the post is formatted it should check for "void ()" and if it's not Inside the code tag, refuse to post and instead link them to the rules about posting...

Should be straightforward enough?..

Then the mods can deal with troublemakers
665  Using Arduino / Programming Questions / Re: How can i control the voltage? on: December 29, 2013, 09:01:42 am
Using a capacitor and pwm you can average out a voltage , eg controlling a regulator's vout.
666  Using Arduino / General Electronics / Re: Car battery voltage divider on: December 26, 2013, 11:55:48 pm
To protect the analog pin a zener could be used....

Another way might simply be an opamp / comparitor ic.
667  Using Arduino / General Electronics / Re: Car battery voltage divider on: December 26, 2013, 07:57:06 pm
In that case a zener or 78xx should be fine then....

668  Using Arduino / General Electronics / Re: What is in my board and what can it do? on: December 26, 2013, 06:04:44 pm
Kinda like going to the hardware store buying all the tools of a proffesional tradesman eg plumbing tools...

Once home you have all the tools to do any plumbing job but it does not mean you're a plumber now lol
669  Using Arduino / General Electronics / Re: Excess voltage applied to 5v pin on UNO on: December 26, 2013, 06:00:41 pm
You might find one or two components left working smiley

RIP uno.
670  Using Arduino / General Electronics / Re: Car battery voltage divider on: December 26, 2013, 05:58:41 pm
70v spike would be absorbed by the battery.... since inductors will only briefly produce a transistient voltage the battery should be enough.

I'll pull out the battery charger, oscilloscope,  multimeter and I'll crank over the engine and see if I can find these spikes which should be dampened by the battery?

671  Using Arduino / General Electronics / Re: Car battery voltage divider on: December 26, 2013, 05:40:09 pm
Edit2:
I've seen voltage spikes on car battery voltage up to a couple of hundred volts on starting or switching heavy loads so in addition to the resistors shown I would add a third resistor in series with the arduino analog input (1k or so) and a diode from the analog input pin to VCC for the arduino with the cathode at VCC to clip the spikes.


On starting... I've only ever seen the voltage drop significantly on cranking the starter motor ... any spikes should be absorbed by the battery....

Hell I've seen circuits using 12v zeners to protect them from induced voltage spikes!

If cars regularly produced several hundred volts even briefly, why is my car radio, electronics, lights not all BLOWN out from voltage spikes?!
672  Using Arduino / Programming Questions / Re: problem with function on: December 24, 2013, 05:32:32 pm
Hugs Pascal Tightly...... (nothing that obfuscated in Pascal or Object Pascal (Delphi/Lazarus)

But ...

Character out  (cout) I was using in c almost 20 years ago from a little yellow book I love Arduino for the fact obfuscated code like the OP's example can even exist, was not the idea of moving from punchcards to a lowish level language like assembly to make life easier not harder...

Luckily Arduino uses a nice clean well defined structure (compared to that of say using atmel's avr studio) eg using a while statement which will allways loop... what is this 1999 createwindowex and handle all the system messages! This is why I practically cry everytime I hsve to use Java it's the complete polar opposite to the mindset of writing code for an 8bit processor and few k of ram, imagine having to use Try/Catch on every other line, Variant mad.

I guess I like C to be clean and readable and Arduino allows it...

Op - next time mention which compiler you're using certain members get easily confused smiley
673  Using Arduino / General Electronics / Re: Understanding the following flip-flop on: December 23, 2013, 11:20:25 pm
This circuit is kinda confusing due to it's design...

Basically the 2 capacitors slowly fill when the voltage on the base is high enough (negative side of the cap) 0.6v the transistor switches on causing the led to glow and the other cap to discharge. . The cycle begins again the other cap starts charging.

Get a circuit emulator or build it..

674  Using Arduino / Project Guidance / Re: trust a power supply? on: December 22, 2013, 02:56:04 am
There's an onboard regulator which converts the 12v to 5v

So less voltage (7v ideally) is better, what's the current rating? 12v how many milliamps?


675  Using Arduino / Project Guidance / Re: Faster better avrs on: December 18, 2013, 11:44:07 pm
You including the due?
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