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16  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
17  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
18  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
19  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
20  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?
21  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
22  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
23  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?
24  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: December 30, 2012, 04:04:07 pm
The offset is used often in single supply audio circuits, the signal is amplified around the offset to amplify the full range of the signal and then the dc component removed before the output
25  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: December 30, 2012, 04:02:02 pm
Ah missed that analog read part, you want to read that full 18v spectrum? And don't trust your meter, dc and ac voltage reading aren't perfect especially if both are present at the same time, it could be just pulsating dc not ac or a more complex waveform, you really need to oscope it to know what you are dealing with, you could be trying to solve a nonexistent problem, either way a voltage dividerlike he suggested would be fine, and if you are unsure a 5.1zener used correctly will ensure the voltage after the divider is between 0 and +5v
Basically the zener cathode (+ or banded end) will go to the input, cathode to ground and you will be protected
This would be after your voltage divider
26  Using Arduino / General Electronics / Re: PCB Routing Tips? on: December 30, 2012, 02:09:01 pm
My tip would be if you had the time to manually route the whole thing, on my projects I always do that and make every trace basically as big as possible (within reason) , also paying attention to special or sensitive traces or routing noiser ones elsewhere, I actually usually place components not where the ratsnest is easy but where. Its best for electrical reasons, with enough time you can figure out a way to make the most complex ratsnest work, trust me I've done a few where it looks so complex it just increases the cool factor 10x because its less random looking and look very fresh
27  Using Arduino / General Electronics / Re: Is arduino equiped with AC protection? on: December 30, 2012, 02:01:57 pm
If you have just a 1M resistor you could get away with using the internal protection diodes and directly hook it up to your source, now this is just technically and no one really like to do this, your best off with using external clipping diodes to protect from >5v and <0v
There will also be resistors involved and the values and wattage of the external diodes will vary depending on your needed frequency response
28  Using Arduino / General Electronics / Re: Op amp output as digital input on: December 30, 2012, 01:53:06 pm
Depends on the opamp, if the 5v is coming from an arduino output you may fry the arduino pin first, depends onthe actual opamp, you couldn't go wrong with a 220 -1kohm resistor in between, you'll never have a problem then so long as the opamp doesn't go above 5v, and then a 5.1v zener would fix that
29  Using Arduino / General Electronics / Re: I want (More than 100% effcient) some LED's! on: December 30, 2012, 12:23:01 am
lumens isnt a very good measure of output since it is a measure of how human eyes can see it, so something that small would probably be less than a lumen, but for example look at infrared leds, they are measured in the same way since you cant see the infrared so technicaly you can have a 10W infrared-led and feel the heat a foot away and yet it will be outputting <1lumen
30  Using Arduino / General Electronics / Re: Zener vs. Voltage divider on: December 29, 2012, 03:15:18 pm
Taking a quick glance at that page you need to level shift not supply power, you should either drop your vcc to 3.3v(easiest) or lookup proper level translators(needed for speed), or find proper zeners that can handle the speed
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