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9691  Using Arduino / Displays / Re: Seven Segments 2 digits with 2 digital pins + 595, etc..., how to wire-control?? on: July 22, 2013, 04:21:22 pm
Add a Serial.print after these 2 lines, confirm you are getting 2 different #s:
    ten_e1 = counts / 10;     //SACA LA DECENA
    ten_e0 = counts % 10;     //SACA LA UNIDAD

Do you have Q7' from  one chip going to SerDataIn on the next chip?
9692  Using Arduino / General Electronics / Re: Looking for some input or suggestions on building a smart circuit ! on: July 22, 2013, 12:57:45 pm
All kinds of step down regulators are possible.
Which you select depends on how much output current you want.
Some examples:
9693  Using Arduino / Project Guidance / Re: Professionally Printing my project? SMD? on: July 22, 2013, 12:52:37 pm
The folks that make the nrl24l01 publish a reference design you can incorporate.
Tricky part is the printed antenna.
Or install it without headers.
Can use flush receptacle pins on the board and small male-male headers on the RF board.
Thinking parts like these:
9694  Using Arduino / Motors, Mechanics, and Power / Re: How reliable is Arduino in a commercial setting? on: July 22, 2013, 12:48:09 pm
Several folks have used one of these screw shields with a Mega to connect up lots of wires for model railroad setups.
54 IO connections.
Do you need to control higher voltages or currents? Adding other components may  be needed.
9695  Using Arduino / General Electronics / Re: Looking for some input or suggestions on building a smart circuit ! on: July 22, 2013, 12:44:50 pm
What output do you want? 5V?
You need a boost regulator circuit that will take battery output and boost it to desired level for as long as battery can supply current.
9696  Using Arduino / Project Guidance / Re: Lilypad Protosnap on: July 22, 2013, 07:48:20 am
bump please.
9697  General Category / General Discussion / Re: ARDUINO NANO KEEPS BLINKING on: July 22, 2013, 07:38:57 am
Please turn off your Caps Lock, that's like shouting.
Have you loaded any sketch into the Nano? If not, the blinking is likely just the bootloader letting you know the board is alive.
(white light? didn't know arduinos used white lights)
9698  Using Arduino / Microcontrollers / Re: Powering the UNO or MEGA. on/off, fron Vin while still having the USB connected on: July 22, 2013, 07:34:39 am
Easiest way is to remove the PTC polyfuse, that will disconnect the USB power coming in. It's the somewhat large flat device near the USB connector.  Or make a cable where you cut the 5V wire.

Note that many ICs specify to not have signals applied that are more than 0.5V above Vcc.  You may find that circuits are partially powered thru the protection diodes on the inputs.
9699  Using Arduino / LEDs and Multiplexing / Re: Mega 2560 and TPIC6B595 shift registers with external power on: July 22, 2013, 07:26:51 am
Yes, TPIC6B595, high bits sink current, low bits do not.
9700  Using Arduino / Programming Questions / Re: Store Lap Times and Display After Time Trials are Over on: July 22, 2013, 12:30:12 am
Why not use EEPROM to store the data?
Check the playground for the EEPROM library, think it even breaks up floats to store the data as 4 bytes.
9701  Using Arduino / LEDs and Multiplexing / Re: LED blanking out... on: July 22, 2013, 12:20:04 am
besides the comparison vs assignment mistake (happens to all of us, gets better with practice smiley )
check the forward voltage drops of the colors.
Not quite sure what you mean "These pairs are wired in series for reference."
but Green/Blue usually have a higher Vf then Red, like 3.2V vs 2.2, so that might keep them from lighting  up also.
9702  Using Arduino / Programming Questions / Re: Nightlight on: July 22, 2013, 12:14:10 am
First, don't post in 2 places.

if (digitalRead(2) == HIGH)

probably want to use an analog pin for this so you can get back more than a 0/1 result.
9703  Using Arduino / General Electronics / Re: What do I need? A simple project on: July 22, 2013, 12:10:44 am
Ooh, you think that's what 3x range meant?
I was thinking 3 different detection ranges (hi, medium, low) in one direction.
9704  Using Arduino / Project Guidance / Re: Getting into radio on: July 21, 2013, 08:27:06 pm
Preferrred method would be to input data into a real transmitter so that real receiver can pick it up.
And use VirtualWire library
9705  Using Arduino / Project Guidance / Re: Getting into radio on: July 21, 2013, 08:13:46 pm
LOL, Sparkgapuino!  Good one smiley
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