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1  Using Arduino / General Electronics / Re: I need help selecting a transistor on: August 18, 2014, 10:10:06 pm
Any npn will do... I can't think of a transistor which can't handle less than 20ma...
2  Community / Bar Sport / Anti Arduino Plugin?!? on: August 18, 2014, 09:15:51 pm

Why!!!!!!!  Is it jealously ? Takes them 5x longer to do something without Arduino? Lol
3  Using Arduino / General Electronics / Re: Using Arduino to turn power supply on and off on: August 18, 2014, 10:07:15 am
Thought about using a fan?
4  Using Arduino / Programming Questions / Re: RFID-RC522 LED blink on: August 18, 2014, 09:59:51 am
The point Paul is making, you have not written any code to make 'mistakes'.

5  Using Arduino / Programming Questions / Re: 5 buttons 16 led's on: August 18, 2014, 09:56:35 am
5 buttons 16 leds...

850 1k resistors?
6  Community / Bar Sport / Environmentally Friendly Water Tanks... on: August 15, 2014, 02:56:50 am
Environmentally Friendly Water Tanks...  they're great but both myself and a mate of mine tend to not use them as much as we should due to the low pressure issue...

So here's what i'm thinking, I'm going to create An Arduino based (i'll move it over to PCB for finial job) sprinkler circuit, or at least that is until i've worked out the theory hence why i want to kick it about here, i'll open hardware anything i eventually come up with ..

But, mistake me if i'm wrong, regular sprinklers require the water,. pressure to be high enough, if it's low it wont sprinkle, i've seen low pressure sprinklers to do the job, but the down side is a lot less water is released...

So, how about slapping on a 6v motor and an Arduino (if you want environmentally friendly a rechargeable 12v battery and a solar panel to go with! if you need a sprinkler, chances are you got lots of sun light smiley

So will a motor, slapped on a regular sprinkler (with mods to drive it?) give it enough force to replicate the effect of the regular water from a regular sprinkler.....
7  Using Arduino / Sensors / Re: analogRead on: August 11, 2014, 03:15:50 am
Still no clear answer here...   or if there is, I see 2 answers.

(It does not need to be a sensor to use analogRead, eg a capacitor or battery)

8  Using Arduino / General Electronics / what's this phenomenon called? on: August 11, 2014, 03:07:37 am
Placing batteries in series no problem.. add the voltages.

But when you use ground between the 2 voltages we get a voltage shift, anyone know the name of this?
9  Using Arduino / Project Guidance / Re: Arduino fire alarm notification on: August 11, 2014, 12:28:05 am
Take it easy cjdelphi, your lack of knowledge is showing.

The 240V alarms have an internal battery backup system, the latest of which are 10 year life span.

I could go in to more detail about operation, voltage levels, how the interlink works etc but I think the original post has been catered for as it appears he has strictly battery alarm and his queries have been answered.

Well duh, and don't tell me to take it easy when I was taking it easy....  you lack a sense of humor .

And so what if they do have a backup battery? Is there a circuit inside to check the battery to make sure it's ok? Just how much knowledge do you have about smoke alarms?

So please recorrect your sentence...

"Your lack of knowledge concerning smoke alarms is showing"

Then yeah you're right, I did not know I had to design and build them to make a comment here, could you also explain how the circuit to detect smoke works... or will your lack of knowledge show?
10  Using Arduino / Sensors / Re: analogRead on: August 11, 2014, 12:14:46 am
0-1023 makes sense but I've been corrected here before by a mod  saying it was NOT 0-1023.
11  Using Arduino / General Electronics / Re: How to design efficient electronic switch on: August 10, 2014, 09:55:58 pm
The shock and awe of electricity, a bbc doc.

The coherer is covered quite well, the first version worked fine in a colder climate but in india the coherer would rust and stick together.

All 3 parts are well worth watching if nothing more than to brush up on your electronics history... it left me with a strong hate for Marconi though and how patents ruined science forever.
12  Community / Bar Sport / Holy Crap Lightning Strike Damage! on: August 10, 2014, 09:47:32 pm

About 3/4ths in after he's finished showing off the pictures, check out the cb radio and the damage caused by a strike, that's insane!
13  Using Arduino / Installation & Troubleshooting / Re: arduino is extremly hot!!! on: August 10, 2014, 09:10:55 pm
Sounds to me that when you put that 1000uf cap on + & - last month, it may have burned the regulator.
You can't do that stuff. A discharged cap is a direct short when power is applied.

A 1mf capacitor on it's voltage rails would not have damaged the atmega chip, I doubt the regulator would have cared much either...

If the cap was on an output pin, different story.

14  Using Arduino / Installation & Troubleshooting / Re: Arduino uno stopped working. Led on, cant be found in devises or port. on: August 10, 2014, 09:06:31 pm
That 12v ac supply sounds like the culprit.

Your atmega chip can simply be lifted out (just a small screwdriver or flat bit of a knife) from it's socket.
15  Using Arduino / Sensors / analogRead on: August 10, 2014, 09:03:55 pm

Can we get an official answer to this?

Is it 0 - 1023 (0 being /1/) like an array....
Is it 0 - 1024 (0 being 0) up to 1024.

I've seen so many conflucting examples now I really don't know which to believe... poll?
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