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1  Using Arduino / General Electronics / Re: wake up sleeping Arduino when water detected on: August 28, 2014, 08:45:34 pm
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They'll be dry
If they are dry there will be no problem.
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My Arduino might get flooded
Just keep it higher than the electrodes  smiley-wink

Make sure you test the system on a regular basis so you know it will work when needed.
2  Using Arduino / General Electronics / Re: Okay to mount Arduino to Styrene? on: August 28, 2014, 03:02:55 pm
If you are concerned run Aluminum FOIL duct tape around the inside.
3  Using Arduino / LEDs and Multiplexing / Re: Switch Matrix for Keyboard on: August 28, 2014, 11:25:19 am
Image re-sized

Works great as is, no other diodes are needed.

For the interrupts, all ones are shifted into the 595 and it is left that way.
No constant need for scanning.
Since you have a one in all the rows, when you touch any key an interrupt is generated via D9-16.
With the interrupt triggered, code simply sends the 595 with a walking 1 pattern while looking for return key in pattern from the 165.
Very fast.
Multiple key presses are ignored in the code.

If you are referring to ghosting, point taken. See: http://pcbheaven.com/wikipages/How_Key_Matrices_Works/
4  Using Arduino / General Electronics / Re: Okay to mount Arduino to Styrene? on: August 27, 2014, 10:45:56 pm
If you are worried rub a dryer sheet on the surface.
5  Using Arduino / Programming Questions / Re: Arduino projects book project 6 on: August 27, 2014, 08:36:40 pm
What Arduino board do you have?
6  Community / Website and Forum / Re: Issue accessing the forum using IE on: August 27, 2014, 07:53:26 pm
Been there done that.   I converted to Chrome after years and years with IE
7  Using Arduino / Programming Questions / Re: Why doesn't a year equal a year? on: August 27, 2014, 07:49:13 pm
int, is two bytes.
8  Using Arduino / Programming Questions / Re: Couple of questions on: August 27, 2014, 07:16:29 pm
Debouncing:
http://www.eng.utah.edu/~cs5780/debouncing.pdf
9  Using Arduino / General Electronics / Re: Insulating a three-way joint on: August 27, 2014, 07:05:46 pm
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put a dob of hot melt glue over the joint and as the heatshrik
Or silicon glue.
10  Using Arduino / General Electronics / Re: 8 bit trigger for your scope or logic analyzer on: August 27, 2014, 06:56:20 pm
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20 (make that 30) years
I guess I am dating myself.
11  Using Arduino / LEDs and Multiplexing / Re: Switch Matrix for Keyboard on: August 27, 2014, 05:06:29 pm
I use hardware SPI for this.
It can handel both in and out for the shift registers.

See example image:
12  Using Arduino / Programming Questions / Re: How to time a loop then move to the next? on: August 27, 2014, 04:29:33 pm
Dare I say "blink without delay" might be of interest?
3 minutes is 180000 milli seconds.
13  Using Arduino / General Electronics / Re: Moisture sensors reading very low values on: August 27, 2014, 04:12:00 pm
I have used 2 pieces of this with great results.
Not sure what the long term will show.

http://www.adafruit.com/products/1361



EDIT:
You could experiment with the center carbon electrode from a AA battery cell also.
14  Using Arduino / General Electronics / Re: Best IC to pilot 4 digits 7 segment on: August 27, 2014, 04:05:46 pm
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but if there are some heavy computational task going on the Arduino can't refresh the screen enoght fast.
I was suggesting SPI because of this.

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And you do not need SPI.
5 different people 5 different ways.
15  Using Arduino / General Electronics / 8 bit trigger for your scope or logic analyzer on: August 27, 2014, 03:39:21 pm
Some times I need to confirm a pattern is present on the output of the 328/1284 or shift register.
Using a circuit similar to this, you can enter a pattern on the DIP switch and monitor A=B output with your scope trigger i/p.
With a logic analyzer, it frees up 7 inputs for other things.
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