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1  Using Arduino / Networking, Protocols, and Devices / Re: Anyone done any XBee/Arduino combo boards? on: April 18, 2014, 10:45:01 pm
I've got this design, uses 1284P for extra SRAM.
Could make it smaller for you.
Or add the Xbee socket to a promini if that's all the processor you need.
2  Using Arduino / General Electronics / Re: Wireless sound on: April 18, 2014, 10:36:50 pm
Look up parts at www.digikey.com, they have links to datasheets direct from the manufacturer, way more readable.

Both those parts use SPI interface for data transfers, will be easy to use.
3  Community / Exhibition / Gallery / Re: My first Arduino on a PCB on: April 18, 2014, 09:48:53 pm
Internal Aref, 1.1V, is good for lower level signals.
1.1/1023 = 1.07mV per step vs 4.88mV/step if Vcc = 5.0V.
Vcc may vary, especially if from USB, which is spec'ed at 5V +/-10%, so 4.75 to 5.25. Plus there may be varying loss thru the PTC fuse, which has some resistance, thus a varying voltage drop across it depending on current load for the rest of the board.
4  Using Arduino / General Electronics / Re: Wireless sound on: April 18, 2014, 08:04:00 pm
The 8-bit ADC conversion rate is 17uS.
So a good bandwidth can be achieved, >40K/sec.
Still 8-bit sound tho.
5  Using Arduino / General Electronics / Re: Wireless sound on: April 18, 2014, 08:00:41 pm
Yes, Arduino has 10-bit. Sample rate is ~10K/second, so maybe 4-5K bandwidth.
What's the sample rate on the other part?
6  Using Arduino / General Electronics / Re: Need a battery source on: April 18, 2014, 07:33:47 pm
I do have some huge computer power supply caps - huge - but I don't want to obliterate the cap putting a lead onto it.
I bet I could use some solder paste and keep the heat down.
7  Using Arduino / Programming Questions / Re: How do I move a sequence through an array? on: April 18, 2014, 07:09:20 pm
Or, output all 0s, and your 4 bytes when you get to the point in the stream where you want them.
8  Using Arduino / General Electronics / Re: Need a battery source on: April 18, 2014, 07:06:47 pm
I'll fire up the big iron and give it a shot - sony battery pack has no cracks to wedge a thin blade in to start prying it apart.
9  Using Arduino / General Electronics / Re: Need a battery source on: April 18, 2014, 06:59:49 pm
Not much room. Plastic tabs on the sides help keep it from moving.
10  Using Arduino / Motors, Mechanics, and Power / Re: Power 1A led from arduino output on: April 18, 2014, 06:04:24 pm
Diagram show 1400mA tho and CAT4101 will not meet that.

BD9207FPS with 1.5A capability will meet 1400mA.

CAT4101 is less pricey and needs fewer components, so if 1A is enough, it'd be the way to go.

Still not sure why so much IR is needed. Need some shades on when that puppy is fired  up!
11  Using Arduino / General Electronics / Re: Need a battery source on: April 18, 2014, 05:56:30 pm
Case doesn't have room, that's why I was after leaded/tabbed batteries to start with.
12  Using Arduino / Project Guidance / Re: Senior Project Multi-Processor Arduino Board on: April 18, 2014, 05:55:26 pm
I'd go with SPI for interfacing. At 8 MHz,  blows 400 KHz I2C away.
13  Using Arduino / Motors, Mechanics, and Power / Re: Power 1A led from arduino output on: April 18, 2014, 05:53:14 pm
CAT4101 underpowered for the stated current:
"The CAT4101 is a constant−current sink driving a string of
high−brightness LEDs up to 1 A with very low dropout of 0.5 V at full
load"
http://www.digikey.com/product-detail/en/CAT4101TV-T75/CAT4101TV-T75CT-ND/1933886
14  Using Arduino / General Electronics / Re: Wireless sound on: April 18, 2014, 05:37:44 pm
These are the ADC & DAC I am using.
AD7680ARMZ
AD5662ARMZ-1
15  Using Arduino / LEDs and Multiplexing / Re: Controlling a Flip Dot Display on: April 18, 2014, 05:28:57 pm
The chart above shows 28 columns, 14 rows - I bet a simple test pulsing the current from row to column and from column to row will show that the multiplexing I describer earlier will work.
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