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91  Using Arduino / General Electronics / Re: Questions on Uno w/Speaker on: August 02, 2011, 06:03:48 pm
You need an audio amplifier...

Increasing mA's or V's would increase wattage. That's what an audio amplifier would do, and that's what I'm asking how to build.
92  Using Arduino / General Electronics / Questions on Uno w/Speaker on: August 02, 2011, 03:13:00 pm
Hi all,
I'm currently working on achieving a decent wattage/volume output from my speaker with my Uno.
Here's what I'm using:

-Arduino Uno
-4 Ohm/10W speaker
-Arduino Tones tutorial

Please correct me if I'm wrong here.
I believe the Uno's max mA output on the digital pins is 30mA, and because the Uno has a 5V output I need a resistor of about
160 Ohms...that's still only .15 Watts, and unacceptably inaudible for me.

My questions are: does higher wattage equal higher volume as I suspect, and how might I increase wattage/volume in my circut?
93  Topics / Science and Measurement / Re: Binary Equation on: July 19, 2011, 04:45:00 pm
haha oh how I love programming nerd conversations!
Thanks for the help.
94  Topics / Science and Measurement / Re: Binary Equation on: July 19, 2011, 07:00:18 am
Let me rephrase: "Is there an algebraic equation to convert between base10 and binary?"
95  Topics / Science and Measurement / Binary Equation on: July 18, 2011, 07:34:31 pm
Is there an algebraic equation that Arduino can run to convert from base 10 to binary form? (and binary to base 10; algebraic)
96  Using Arduino / General Electronics / Re: Phototransistors/LED's/PNP Transistors on: May 02, 2011, 04:58:55 pm
Ah, I looked up the datasheets for my old Transistors. They're NPN. Thank you for the help!
97  Using Arduino / General Electronics / Phototransistors/LED's/PNP Transistors on: May 02, 2011, 04:47:47 pm
I would like to know:
1. How do you tell a phototransistor from an LED?
2. How might I wire a phototransistor to my Uno?
3. I recently bought two new PNP transistors, for some reason the base pin behaves in the exact opposite fashion of my other two PNP's. Why is that?
98  Using Arduino / General Electronics / Re: IR Wiring on: April 30, 2011, 08:55:48 am
I'm not worried about actual communication yet. I found the part number for the nodule I have and it had wiring directions in it. All's good now.
99  Using Arduino / General Electronics / IR Wiring on: April 29, 2011, 04:11:10 pm
I'm curious how I might wire a simple, three prong IR receiver to my UNO, and I would love some help.
100  Forum 2005-2010 (read only) / Troubleshooting / Mac Application Arduino IDE failures... on: January 16, 2011, 09:02:01 pm
So far, Arduino has been great...but today I've been running into a bit of a problem. Several times now I've gotten a message in the programmer saying "programmer is not responding.", and the program does not download. I've tried all of the troubleshooting suggestions. no luck there... I've tried downloading several different programs. no luck. I've tried restarting the application, and the only result was the application failing to open. I tried restarting my computer, and after I did I was able to download one program,but then, the whole shebang. all...over...again.

just in case you're wondering I have the Arduino Uno, the latest version of Arduino (as of dec 25), Mac OSX 10.6.6, and this is the first day I've been experiencing problems after several days of programing.
Any ideas??
101  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: External Power supply doesn't work on: January 12, 2011, 05:50:10 pm
Thanks for the help,
I used my handy-dandy multimeter and narrowed the problem down to poor connections in the external power supply.
It's funny how some problems are so freakishly simple.
102  Forum 2005-2010 (read only) / Bugs & Suggestions / External Power supply doesn't work on: January 11, 2011, 02:23:44 pm
I recently got the latest Arduino Uno in the Solarbotics ( Experimenter's Kit for Arduino.
I have good batteries in the external power supply, but my arduino only turns on and runs the sketches when connected via USB.
Am I missing something?
Why don't the sketches run on external power supply?
103  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Is Arduino right for me? on: December 03, 2010, 07:16:26 pm
I would like to have it ready out of the box, and I'm focusing mainly on programming. I don't have anything in particular that I want to do yet because I just want to get a better feel for different types of programming rather than a specific project for now.
Thanks for the help.
104  Forum 2005-2010 (read only) / Frequently-Asked Questions / Is Arduino right for me? on: December 02, 2010, 10:29:51 pm
I've been using the LEGO Mindstorms NXT for awhile, and robotics has been really growing on me. smiley I am currently taking a high school class (I'm home schooled) in John Hanson's NXC programming language. The language is C based, and I have been learning quite a bit about C structure. So far so good.
I have a few questions: Now that I've been introduced to C and that I'm learning C type, would Arduino be a good learning base for me to expand to/add programing knowledge in? If so, what type of board should I get? Is there a basic learning board? Is there some sort of Arduino programming introduction manual?
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