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16  Using Arduino / Storage / SD card file naming on: October 11, 2012, 12:32:59 am
I need some coding help, and would appreciate any suggestions as to the feasibility of this idea and how to accomplish it.

I'm looking to incorporate a SD card to log disolved oxygen readings from an atlas scientific probe and breakout board. I would like to set up the arduino to write to a new file for each reading. I'm looking for a way in which I can have the file be named based on the date/time as well as a user defined 5 digit number. i.e. 2012.10.10.09.30.xxxxx.csv.

I would like the date and time section of the file name to be set automatically, and use a rotary encoder to scroll through 0-9 and use the momentary switch to move to the next number in the user defined section. Once the last number is selected, pressing the momentary switch would begin logging.

As far as the SD card, I was looking at using the Parallex SD card adapter sold by Jameco (2082935), but am open to other options. Any guidance would be greatly appreciated.

17  Using Arduino / Programming Questions / Re: max31855 thermocouple amplifier error on: August 02, 2012, 06:54:17 pm
I figured it out. I had downloaded the max31855 library from adafruit. Opening up the .h and .cpp files in xcode revealed it was referencing the amplifier starting with adafruit_. Removing this part made my code work.
18  Using Arduino / Programming Questions / max31855 thermocouple amplifier error on: August 02, 2012, 05:51:27 pm
I'm trying to get a modified version of the solder reflow oven from the Ben Heck show up and running. I'm having some problems though. When verifying the code, I get the following errors:

Code:
solder_reflow:189: error: 'MAX31855' does not name a type
solder_reflow.cpp: In function 'void loop()':
solder_reflow:248: error: 'thermocouple' was not declared in this scope

I'm not really sure where to go from here to fix this. Any advice?
19  Using Arduino / Displays / 1x16 cable on: July 28, 2012, 07:58:12 pm
I'm looking for a short 1x16 cable, male on one end, female on the other to hook an LCD up to a perfboard arduino. Any suggestions?
20  Using Arduino / General Electronics / Re: Embedded power on: July 24, 2012, 10:01:26 pm
Cool build Constantin. Where did you get the insulation from?

In drawing up the schematic, if I'm getting 5v out from the encapsulated power supply, would adding a 7805 regulator create a stable enough analog reference? I'm thinking that if 3.3 is better for the analog reference, I'll go with a LM1117T. Anytime someone says "jittery", I think of my first car and that was a nightmare.

What I've got so far is PSU>10 uf electrolytic>7805>10 uf electrolytic>10 uf tantalum>LM1117>10 uf tantalum
Does that look correct? For the extra $1.50 or so, is the 7805 setup going to do me anything?

If anybody knows of a better 5v psu that might provide me with a better bang for the buck and less mess, I'm all ears.
21  Using Arduino / General Electronics / Re: Embedded power on: July 24, 2012, 12:49:36 pm
I am looking to take the chip from the Arduino and pop it into a custom setup that I create. I figure that if I'm going to go, I might as well go all out. Buying a shield seems to be cheating. Finding out what it takes to put together an embedded solution that I can swap out with the toaster oven's circuit board I am sure will teach me a lot, and be a hell of a lot more interesting than plugging together two things that "just work". There is a .ide on github.
22  Using Arduino / General Electronics / Re: Embedded power on: July 22, 2012, 02:37:35 am
Do I also need a linear regulator between this and the ATMEGA?
23  Using Arduino / General Electronics / Re: Embedded power on: July 20, 2012, 06:42:11 pm
Would this work?
https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=1954906
24  Using Arduino / General Electronics / Embedded power on: July 20, 2012, 02:22:06 pm
I'm looking to create a solder reflow oven similar to the one created on the Ben Heck show. I want to take the AT MEGA chip and put it on it's own circuit board. I know I'll need a crystal, but I'm not sure what else is needed exactly. What do I need to take 120v off the power supply cable to the toaster oven and get it to 5V DC for the arduino? I know I could pull apart a wall wart, but that seems a bit messy. Perhaps that is the best option though. Thought I would get everyone's take on that before starting.
25  Using Arduino / Motors, Mechanics, and Power / Re: Swagelok valve actuator on: February 12, 2012, 10:54:13 pm
As the valves are the 45 series, based on the following tech sheet, I believe I need ~95 lb/in torque to turn the valve. Is that right? It seems really high -- the valves are pretty easy to turn by hand. Most of the "hi-torque" hobby servos seem to be in the 80 oz/in range. As in 5 lb/in.

http://ventil.by/catalog/pdf_en/02136.pdf
26  Using Arduino / General Electronics / Re: 240VAC, splitting up on: February 06, 2012, 04:18:54 pm
a_m, that makes great sense. I think i would smell it if one of the pumps was drawing 60 amps, but this looks to be a much better solution to distributing power, while preventing massive current draws. Thank you.
27  Using Arduino / General Electronics / Re: 240VAC, splitting up on: February 04, 2012, 12:54:13 pm
Hmmm. It seems with those, each terminal is isolated. i.e. I couldn't attach a wire from the power in receptacle to the block, and then wire out to each load from there. I was figuring that I would need a total of 4 distribution blocks (h1, h2, neutral, ground) to keep from an unruly mess of wires.

28  Using Arduino / General Electronics / Re: 240VAC, splitting up on: February 03, 2012, 06:27:40 pm
Think this will work to split power from the input receptacle to the various loads? http://www.mouser.com/ProductDetail/Molex/39910-0106/?qs=QQJxVsr8EGadqRk8HMoGrw%3d%3d
29  Using Arduino / General Electronics / Re: 240VAC, splitting up on: February 03, 2012, 11:40:12 am
Yea, I was going to hook the unit up to a 60 amp breaker.

Any suggestions on distribution blocks? Still looking for those...
30  Using Arduino / Motors, Mechanics, and Power / Re: Swagelok valve actuator on: February 03, 2012, 11:37:48 am
A linear actuator won't work, as there are multiple outputs. I need to be able to switch between 3 outputs on two of the valves and 4 outputs on the other two valves. A DC motor on a threaded rod sounds like an inexpensive way to go, but too darn inaccurate. Perhaps if I went with a stepper motor, I could make my own actuator. I was hoping somebody had experience with a particular actuator that may fit the build and the budget.
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