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1  Using Arduino / Project Guidance / Re: Detecting audio frequency (notes) on: December 29, 2011, 10:50:44 pm
Sweet! Thank you for pointing that out. So now I know it can be done. Now to research the "how". Again, thank you. If I get anywhere, I'll post a final project in about a week  smiley
2  Using Arduino / Project Guidance / Detecting audio frequency (notes) on: December 29, 2011, 10:37:29 pm
Ok.. I have thought up a great project idea, but I am not sure if an arduino would be up to the task. Basically, I'd like to analyze audio input and have LEDs flash in "synch".
My question is, if run through the proper RC filters to isolate a particular range (say bass guitar), could the arduino "hear" audio and be like "oh, that's and E note. Now it's an A"?
If not, any ideas of how to go about it? I could use a PC/usb serial solution, but I'd like to make it standalone...
3  Using Arduino / Project Guidance / Re: Very Small Arduino on: September 25, 2011, 09:21:22 pm
You guys are making me nervous. I have never done SMD...
4  Using Arduino / Project Guidance / Re: Arduino Weather Station on: September 25, 2011, 01:35:34 am
Wind vane... excellent.
I am also building a solar powered weather station. (well, started on it anyway) smiley-grin I am using an Anarduino (eBay knockoff) outside, wirelessly send info to an indoor Arduino that compares outdoor temp to indoor temp, and pushes all data to an XML file. Eventually, I will have a PHP that queries weather.com, compares my data to theirs.

As for the wind vane, my design (so far only in my head) uses 3 or 4 hall effect sensors and a magnet on the wind vane. Maybe triangulate the hall effect data to determine position. Dunno.. works well in my head...

Also.. what do you think about using a motor with a fan on it to generate current to measure wind speed?
5  Using Arduino / Project Guidance / Re: Electro mechanical issue: Rainfall on: August 25, 2011, 09:28:00 pm
Bah! None in stock. They ordered it for me tho. Maybe Monday...
6  Using Arduino / Project Guidance / Re: Electro mechanical issue: Rainfall on: August 25, 2011, 06:33:19 pm
Wow, the TX32U-IT is definitely worth a gamble. I was considering a beaker and a scale! lol. As for the wind measurement, I am trying to build this as cheaply as possible and also build as most of it myself as I can. I was thinking of cutting 2 ping-pong balls in half to use as the cups. I am off to wallyworld for the TX32U-IT now tho. smiley-grin
7  Using Arduino / Project Guidance / Electro mechanical issue: Rainfall on: August 25, 2011, 06:00:18 pm
Okay, so I am going to build a small weather station out on my deck. Going to measure barometric pressure, relative humidity, temperature, wind speed, and hopefully,  rainfall. Now I can get chips to measure most of those things. Was thinking about using a one of those spinney things with the little cups (with little neodymium magnets and a hall effect sensor) for the wind speed. But for the life of me, I cannot seem to be able to wrap my head around an easy way to measure rainfall. Any ideas?
8  Using Arduino / General Electronics / Re: Quickie question on voltage dividers. on: August 16, 2011, 09:18:54 am
@ Techone,

Yeah, the on board 7805 can handle 12v, however, I get anywhere from 12.2 to 13.5 in my 69 El Camino. Old car, and though a lot of it has been computerized (ignition, air intake control, etc), the alternator puts off varying voltage depending on temp, rpm, how hard the bass is hitting my subs and whatever else may or may not be running off of it. Sounds odd, but I had the same issue with the old alternator setup as well before I switched to the current 300amp model.
9  Using Arduino / General Electronics / Re: Quickie question on voltage dividers. on: August 15, 2011, 07:25:56 pm
It does. So in effect I am right, and voltage dividers needs to be "dialed in" so to speak depending on the circuit attacked. I was just in another thread where somebody was talking about driving an arduino in a car, and some suggested they use a divider to power it. To me, that just seems a little sketchy. I am about to put my LED project in my car, but I am using a 7809 and a couple caps to power it.
10  Using Arduino / General Electronics / Quickie question on voltage dividers. on: August 15, 2011, 07:08:27 pm
Okay.. So as I peruse the forums here, I see a lot of advice involving voltage dividers, typically something along the lines of "+12v---10k---+6v---10k---ground"

My question revolves something I learned my 1st year as an electrician. Electricity always follows the path of least resistance. Using this as a voltage divider, what would prevent voltage drop at the 6v if you hook up a larger circuit with a fair bit of resistance? Why wouldn't more current just take the  shortcut through the second 10k resistor to ground, since that would be "easier" than going through your project?
11  Using Arduino / General Electronics / Re: Connecting a solenoid to ardunio on: August 13, 2011, 01:07:05 am
Honestly, I would not use a solenoid for this. I would still go with a stepper motor. And, after looking into my own crapper, I came up with a way to have both work. Keep in mind I am NOT an artist.

Both the handle AND the arduino would work... If I did use a solenoid, I use it to do the same thing, in tank. Pulling up the string/chain would require MUCH less force that manipulating the handle.
12  Using Arduino / General Electronics / Re: Connecting a solenoid to ardunio on: August 13, 2011, 12:21:39 am
Hmm... do you need to keep the existing handle? If not, I think a stepper motor pulling the flapper up would be neat, and all hidden in tank. My issue with a solenoid manipulating a handle would be that solenoids are generally pretty quick. Would also need to be mounted about the handle to allow "normal" use of the handle. Even then the solenoid would possible get in the way...
13  Using Arduino / General Electronics / Re: How do i read this? on: August 13, 2011, 12:10:00 am
Yeah. What is on the right in the pic is what is on the right in your schematic. My guess would be that there would be a male-to-male cord to connect between your device and a camera.
14  Using Arduino / General Electronics / Re: Connecting a solenoid to ardunio on: August 13, 2011, 12:08:16 am
What are you going to be using it for? How long do you need it on at any one time?  Do you need it to switch on/off/on very rapidly?
I am looking ate using a combination of servos and solenoids to make a robotic drum kit... I was thinking of relays at 1st, but they are a bit too slow, so I am myself working on a transistor solution.
15  Using Arduino / General Electronics / Re: How do i read this? on: August 12, 2011, 11:55:04 pm
The "far right" looks like a TRS plug  (think stereo headphones). Stands for Tip, Ring Sleeve. The sleeve is usually ground, while the ring and tip carry current. Ofter used in switches as well (My guitar amp uses the 1/4" variety for the foot controls.)...

EDIT: Rather, this looks like the female counterpart to the male "plug"... so now think headphone jack. The contact at the furthest right touches the sleeve, and the ^ and v  contact the tip and ring.
A cool little pic..
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