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136  Forum 2005-2010 (read only) / Interfacing / Re: SPI Works.... sometimes? on: June 24, 2010, 01:36:50 am
Check that you have sufficient delay. Or try adding a delay(100) in the loop function to test.
137  Forum 2005-2010 (read only) / Interfacing / Re: Analog multiplexer wiring problem? on: June 24, 2010, 06:07:21 am
Best guess: 4051b
http://ics.nxp.com/products/hef/datasheet/hef4051b.pdf
138  Forum 2005-2010 (read only) / Interfacing / Re: Analog multiplexer wiring problem? on: June 24, 2010, 01:33:56 am
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What do I do with Vss, Vee, and the common in/out?

Ground, ground, and your input line.

Multiplexers generally dont have a latch, so you will only be able to drive 1 LED at a time.

PS: And remember the series resistors before each LED.
139  Forum 2005-2010 (read only) / Interfacing / Re: 4Mbps Data transfer with arduino! on: June 22, 2010, 07:49:52 am
The Arduino can do 2mbit in Serial.

Try that first.
140  Forum 2005-2010 (read only) / Interfacing / Re: Not enough I/O pins on: June 22, 2010, 05:14:30 am
Finally found the local distributors for Farnell. Pretty close to me in fact.

Thanks Grumpy_Mike  smiley
141  Forum 2005-2010 (read only) / Interfacing / Re: Not enough I/O pins on: June 21, 2010, 02:53:36 pm
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Though the default Arduino I2C speed is 100KHz, it's still pretty fast.

I got a couple of MCP23016's.

Mine runs pretty good at 400khz, after I tweaked the Wire libs.

With a few other I2C devices, I had to drop it to 300khz though.
142  Forum 2005-2010 (read only) / Interfacing / Re: Not enough I/O pins on: June 21, 2010, 08:31:26 am
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Farnell have 457 in stock:-

Pity that I am in South Africa.  Should have asked the English football team to bring me some   :smiley
143  Forum 2005-2010 (read only) / Interfacing / Re: Not enough I/O pins on: June 21, 2010, 07:06:40 am
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For extra I/O with fast access use the MCP23S17

I'm so badly trying to get hold of them, but RS has no stock currently...  smiley-sad
144  Forum 2005-2010 (read only) / Interfacing / Re: Not enough I/O pins on: June 21, 2010, 03:35:08 am
MCP23xxx series  8/16 port(pin really) I/O expanders. I2C or SPI.
145  Forum 2005-2010 (read only) / Interfacing / Re: PG240160BRF-XNN-H on: June 19, 2010, 05:57:36 am
Here is a start.

http://www.datasheetarchive.com/PG240160-B-datasheet.html

It is a little on the vague side, but see if you can find similar ones.

A tip for searching, dont use all the numbers  smiley
146  Forum 2005-2010 (read only) / Interfacing / Re: IR photodiode to read LED pulse from meter? on: June 11, 2010, 06:17:10 am
I did something similar a while back, but just used a LDR, but have 'tuned' it to pulse on a digital pin.  I just care about on and off and timing that.
147  Forum 2005-2010 (read only) / Interfacing / Re: DS18B20 unique names on: June 10, 2010, 06:55:00 am
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All the code I have found just spits out the temps with no way to distinguish them from each other.

Use the DallasTemperature library.  Works well.
148  Forum 2005-2010 (read only) / Interfacing / Re: I2C on Arduino to a Maxin 6651 Fan Controller on: June 06, 2010, 01:48:03 am
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Wire.send(Tach0Command);    
Wire.requestFrom(FanControllerAddress,1);

You need a Wire.endTransmission before the Wire.requestFrom.
149  Forum 2005-2010 (read only) / Interfacing / Re: I2C EEPROM Emulator - arduino. on: May 28, 2010, 06:17:59 am
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byte WR = Wire.receive();

What is that for? That will be called before setup() and your call to Wire.begin().
150  Forum 2005-2010 (read only) / Interfacing / Re: The Arduino IDE Serial Monitor on: May 27, 2010, 01:04:14 am
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int val = 0; // variable to store the value coming
            // from the sensor

Change to byte, and the rest should work.
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