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1  Using Arduino / General Electronics / Re: Are momentarily shorted batteries still safe to use? on: Today at 12:55:32 am
Your batteries are probably just fine.
Lithium burns.
2  Using Arduino / Programming Questions / Re: After set a watchdog,the mcu died.I can't reset it though the Reset pin on: Today at 12:44:25 am
Your experience is showing.
Thank you, I was wondering.
3  Using Arduino / Programming Questions / Re: After set a watchdog,the mcu died.I can't reset it though the Reset pin on: Today at 12:10:26 am
Nick, you might want to add another w to your link in reply #5
4  Using Arduino / Project Guidance / Re: House alarm circuit help plz on: August 29, 2014, 07:12:47 pm
I urge you to use the internet to look for Arduino tutorials.
Here his an example:
https://learn.adafruit.com/search?q=Arduino

When you have specific questions, lots of people are here to help.
Also look on this site in the learning and reference sections.
5  Using Arduino / General Electronics / Re: wake up sleeping Arduino when water detected on: August 28, 2014, 08:45:34 pm
Quote
They'll be dry
If they are dry there will be no problem.
Quote
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.
6  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.
7  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/
8  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.
9  Using Arduino / Programming Questions / Re: Arduino projects book project 6 on: August 27, 2014, 08:36:40 pm
What Arduino board do you have?
10  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
11  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.
12  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
13  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.
14  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.
15  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:
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