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1  Using Arduino / General Electronics / Re: Reading 0-100 mV signal on: December 17, 2013, 09:39:49 am
You can set the voltage reference to external and put a lower voltage on the aref pin, I'm not exactly how low it can go but you can probably get the range alot closer without any hardware
2  Community / Bar Sport / strange radio outlet? help figuring what it is on: December 12, 2013, 08:37:48 pm
Hey I found this antique outlet in a wall, it has a receptor looking thing on the bottom one labeled ground the other antenna , that isn't confusing, weird part is there are two momentary buttons that when both pressed it seems to short out the outlet below? Any ideas or knowledge on this?
3  Using Arduino / General Electronics / Re: Delaying a digital signal on: September 05, 2013, 07:27:49 pm
Could Just use a 555 timer to delay it,
4  Using Arduino / General Electronics / Re: Bluetooth and Arduino Electromagnetic interference question on: August 29, 2013, 06:36:31 pm
Maybe try a 433 mhz wireless link? There are tons cheap on ebay, tho ive never tried themn
5  Using Arduino / General Electronics / Re: Bluetooth and Arduino Electromagnetic interference question on: August 28, 2013, 08:23:13 pm
 Do you have a difference if you separate the bluetooth module from the rest? As in bring the module out of the casing and as far as possible while still connected
Also another thought would be since the noise is audible perhaps its not radio frequency noise from the bluetooth but noise from the serial transmission, perhaps increasing the baud rate above audible could help, if you bad a ossciloscope and "watched" noise that would helpbyou find its orign,
So maybe try a baud rate like 57600, which can be done with AT commands to the module, exact specs on doing that can be found by searching your module on the internet(looka like hc-05 , same i use)D
6  Using Arduino / Programming Questions / Re: Can-bus shield on: August 26, 2013, 07:36:14 pm
 You  would just have one canbus shield per arduino, they can all communite together assuming one acts as the master(the one that reads), and the other two as slaves(the ones that "write" or reply back to the master,
Just communicate with eaxh one , one at time, to gather the data.u
7  Using Arduino / General Electronics / Re: piezo tweeter to amplifier coupling on: August 26, 2013, 03:07:10 pm
You could probably get away with a much simpler amplifier, a transistor or mosfet would work easily, especially since its a square wave and not an actual analog signal .u
8  Using Arduino / General Electronics / Re: What is it about the lifespan of solder paste? on: August 26, 2013, 03:02:12 pm
From my experience the hardest part with old solder paste is applying it, i don't use masks or anything, just a dab on the pads, but if you warm the board a bit iy helps, it really doesnt take much for most components
And btw its alot easier to use a hot air pen then trying to hand solder smd parts, the hot air allows it to flow into the right position  naturally , for multiple pin components a solder wick makes quick work of any solder bridges.m
9  Using Arduino / Project Guidance / Re: Multiple push buttons one interrupt on: July 29, 2013, 09:55:07 pm
my suggestion would be to start delegating the work to another ic, you could use a attiny85 that just monitors the rotary and provides a count of the current position and the difference from the last one, then in your main program just communicate with it via serial (fast a"s possible to avoid delays, maybe 57600 or higher) to gather that information and reset the count, this way the main "brain" doesnt have to worry about time consuming analog reads and the other ic doesnt have to worry about anything but those time consuming reads and responding to requests
you can use an attiny85 which i would say is the easiest if you know how or perhaps come up with a more discrete method(which would need more supporting hardware and not as easily reconfigured
best part about the attiny 85 is its relatively cheap and can be programmed with the arduino software once set up properly(with an isp programmer) and can be run at 8mhz without any extra hardware so with literally just a decoupling cap and the ic you can accompish this for less than a few dollars extra p
10  Using Arduino / Project Guidance / Re: Music to vibration on: July 18, 2013, 08:24:56 pm
if i helps here is some of my code from my projects, not commented perfectly but it should help you play around with it
11  Using Arduino / Project Guidance / 4/20 Ma arduino as a sensor on: May 24, 2013, 08:08:46 pm
Hey has anyone dabbled using the arduino in  a 4/20 ma loop?  Not as a master but a slave, any reading material on making a general device would be helpful too, I figure the hard post its running an arduino at less than 4ma plus sensor, while putting the appropriate draw
Also need a supply too to power the Dino that handles maybe 36vdc and is effecient
12  Community / Bar Sport / Re: Your latest purchase on: January 03, 2013, 07:06:08 am
Jw how much did u pay for some of those thing like the slave,master bluetooth and the sd card slot?
13  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: January 01, 2013, 12:51:15 pm
You can use a digitalRead then , and just count, but as for the hardware side most of those methods above will work fine for a digital read, though now your input impedance can be higher
14  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: December 31, 2012, 06:24:12 pm
My guess is that as the frequency increses the impedance of the cap goes down, affecting the rms voltage you are reading, essentially the cap is acting like part of the voltage divider, if you were to check the top resistor I bet the voltage would increase across that
15  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: December 31, 2012, 09:33:55 am
I highly doubt its 60hz in an automotive wire, you really need to borrow an oscilloscope to see what's going on, what does that wire come from?
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