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241  Using Arduino / General Electronics / Re: Trying to understand pull-up resistors on: November 07, 2012, 05:52:40 pm
Your totally wrong here the DS18B20 is one wire the resistor is used to hold the line high when the chip is not sending data.

The ardunio send out a call for the DS18B20 and it send back that its on the line after is sees that the Line is high it sends data. Then when the line is high the ardnuio can send to the DS18B20 what it wants if it needs to set the chip or just let the chip tell how hot or cold it it is.
242  Using Arduino / Project Guidance / Re: Guidance on an outdoor surveillance application on: October 31, 2012, 10:44:39 am
I don't no if this would work for you but I used a CCD camera It has 10 IR leds so it can see at night.

This is what these things can do It will output a voltage change when you move, but it's read able you could tell what is in front of it.



It could do what you want I hooked the power to 5 volts and used ADC to read the video and you get movement readings
that change with size and heat.

And there repeatable
243  Using Arduino / Project Guidance / Re: TX/RX pin and serial communication on: October 30, 2012, 10:01:42 am
This may help you Plug the uno to your PC load a blink sketch now when it
gets to where it tells program Memory used at the bottom of the IDE press the reset button and let it go.

That should let the boot loader take over. And should program you may have to do more then one time to get the timing right But if you chip didn't
blow the pins TX and RX it should work.

The boot loader starts first then your program so if you reset it will give you a little more time so the boot loader can take over before your program loads. 
244  Using Arduino / Project Guidance / Re: What do I need ?! on: October 30, 2012, 09:01:27 am
You would get better help if you had named this telling what your making
I would ask a mod to change the name

To something like this

What parts do I need to make a money collecting machine.

Not really much less you want to count the money. So most of what you add to it is really for show. I would think of added blinking LED's to cache peoples eyes so they drop in some money.
245  Using Arduino / General Electronics / Re: AMS1117 3.3v volt regulator draws power when bypassed on: May 28, 2012, 09:35:59 pm
I guess you did post that But there was the same thing posted by Jon. That site you can't tell who did what it's changed to much. Still great idea majenko not new but Nice

The OP can use smd part it would be very small foot print.
246  Using Arduino / General Electronics / Re: AMS1117 3.3v volt regulator draws power when bypassed on: May 28, 2012, 02:13:49 am
John posted how to use a diode without voltage drop over here http://digital-diy.com/forum/general-electronics/mini-tip-diode-without-a-voltage-drop-t2206.html#p13262
247  Using Arduino / General Electronics / Re: 5v relay and motor on: May 14, 2012, 06:23:50 pm
If what your saying is you hooked 8 volts to the arduino and are by passing the regulator.
If that's right you may of cooked it.
248  Using Arduino / General Electronics / Re: mosfet failure reasons? on: May 10, 2012, 10:13:27 pm
Sounds like you have shoot-through show your circuit. But its hard to say not seeing how you have the speaker hooked up. But you should be using a cap to feed the speaker.
249  Using Arduino / Project Guidance / Re: Door Lock on: April 27, 2012, 10:26:35 pm
You don't what to hold that latch open for a long time there not made for that.

Have a look at this http://arduserver.com/ it's basically the same thing led on door opens led off door is locked just use a fet to sink the power of the latch coil.
250  Using Arduino / General Electronics / Re: Snapped strip board, best way to fix? on: March 17, 2012, 07:56:09 pm
Use a sharp knife to score it on both sides like has been said your lungs will love you for that.

Any kind of grinding needs lots of ventilation and a mask these boards are made with glass fibers and when you grind it the dust will stay in you lungs which can't be good.   
251  Using Arduino / Installation & Troubleshooting / Re: pin 0 RX??????????? on: March 09, 2012, 11:18:34 pm
Pin 0 is tied to the USB 16U chips TX pin it would be High
252  Using Arduino / Project Guidance / Re: Good Ideas from talented indivudals on: March 09, 2012, 10:09:26 pm
This would be a simple fix let a spring hit the microswitch The spring would let you over tighten the cap and not break the microswitch.

And could easily  be setup to insure you have tighten the cap
 
253  Using Arduino / Installation & Troubleshooting / Re: My win7 computer won't recognize my uno on: February 18, 2012, 11:21:58 pm
he on the wrong com port
254  Using Arduino / Installation & Troubleshooting / Re: Smoke coming from UNO on: February 18, 2012, 11:51:46 am
It's easy to mess up we all do it just some lie about it. But if you fallow so simple rules you going to still have a usable mirocontroller in the end.

Never put power on till you are 100% sure you have the power lines right that's number one
and two always check the wiring a few times always.

Three always limit the power to a pin to big of a resistor not going to hurt to small and you'll see smoke.   
255  Using Arduino / Installation & Troubleshooting / Re: Smoke coming from UNO on: February 17, 2012, 05:40:43 pm
I can't believe any one would say the "design is very poor"  Come on here if you fixed this so you couldn't break it it wouldn't be able to do any thing good it would be in a bubble.

You don't put 12 volts on any pin and you don't try to sink or source more power then it can put out.

You wouldn't pull a Mack Truck with a 4 banger car would you if some thing went wrong it would run over you can't stop it.

Same thing here you pulled more power then it could supply and your Mack ran over it.

But the Op may be lucky and he just burned the power supply out by back feeding it  
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