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1  Using Arduino / Programming Questions / Re: Arduino Time library and Time alarm on: Today at 11:52:15 am
If you are asking if you can power the Nano from an external power source, connect raw power to the vin pad.
If you want to disable restart on the Nano when you plug it into thr PC, remove the capacitor connected to DTR.
Schematic:
http://arduino.cc/en/uploads/Main/ArduinoNano30Schematic.pdf
2  Using Arduino / Project Guidance / Re: Quiet vacuum pump recommendations? on: August 31, 2014, 03:01:26 pm
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quiet vacuum pump
Never heard of one.
Use tape.
3  Using Arduino / Programming Questions / Re: simple logic wrong result on: August 31, 2014, 01:57:51 am
I am curious, what is bb.clicks?
4  Using Arduino / Programming Questions / Re: Solved for loop like basic? on: August 30, 2014, 07:47:55 pm
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PS  My favorite debug  code  is  for(:; - stops the processor at desired place.
?
5  Using Arduino / Project Guidance / Handheld terminal suggestions welcomed on: August 30, 2014, 02:43:19 pm
I am planning my next project. To be a handheld terminal.
Here are some things that I am considering to incorporate:
1.   64 key keypad
2.   4X20 LCD display
3.   TTL/RS232 input perhaps 422/485
4.   Selectable baud rate (Dip switch or keyboard selectable?)
5.   Several front panel LED indicators
6.   Some analog input capability. Perhaps some digital I/Ps. Maybe a few digital O/Ps
7.   SD card data logging capability (using Bobuino2 board)
8.   Simple sound output capability (piezo)
9.   Internal/external power
10.   Perhaps wake up on external interrupt
11.   RTC

Do you have any suggestions?
6  Using Arduino / General Electronics / Re: Are momentarily shorted batteries still safe to use? on: August 30, 2014, 12:55:32 am
Your batteries are probably just fine.
Lithium burns.
7  Using Arduino / Programming Questions / Re: After set a watchdog,the mcu died.I can't reset it though the Reset pin on: August 30, 2014, 12:44:25 am
Your experience is showing.
Thank you, I was wondering.
8  Using Arduino / Programming Questions / Re: After set a watchdog,the mcu died.I can't reset it though the Reset pin on: August 30, 2014, 12:10:26 am
Nick, you might want to add another w to your link in reply #5
9  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.
10  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.
11  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.
12  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/
13  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.
14  Using Arduino / Programming Questions / Re: Arduino projects book project 6 on: August 27, 2014, 08:36:40 pm
What Arduino board do you have?
15  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.
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