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46  Forum 2005-2010 (read only) / Interfacing / Re: USB FTDI Cable on: June 30, 2009, 11:48:14 am
I just bought one from adafruit, $20 + shipping:

47  Forum 2005-2010 (read only) / Interfacing / Re: Baby monitor / pressure mat on: May 29, 2009, 02:43:18 pm
You might try making a 'mat' using two thin pieces of wood and 4 of the pressure sensors.  Place the sensors at each corner of the board.  All the weight on the board would then be distributed across the 4 sensors.  As the baby squirms around, the distribution of forces should change, and the readings from the four sensors would fluctuate.  It would take some pretty fancy algorithm to figure out the pattern or forces, and then determine how much activity there is.  You'd also probably have to put the board contraption under the mattress, although with 4 sensors sharing the load it might be ok.
48  Forum 2005-2010 (read only) / Interfacing / Re: push button recomendations on: May 22, 2009, 11:38:29 pm
If you want to spend a whole lot on a button, these LCD screen buttons look pretty cool
49  Forum 2005-2010 (read only) / Interfacing / Re: Quick question about range sensor on: May 12, 2009, 10:17:26 pm
I'm not sure if you have to, but you're not declaring pin 7 as an input pin.  I've used the EZ0, and I just used +5v, GND, and the analog wire.
50  Forum 2005-2010 (read only) / Interfacing / Re: Unsolvable Problem on: May 12, 2009, 11:41:28 pm
According to the method returns a single byte at a time.  The example on that page also is pretty close to what you're doing, might want to get that one working first, then modify it for your situation.
51  Forum 2005-2010 (read only) / Interfacing / Re: New Ethernet Shield for Arduino on the block on: April 29, 2009, 03:31:36 pm
Just got mine last night and put it together.  Works great!  

The wiznet riser sticks up pretty far, so as you can see its hard to put more shields on top of it.  I stuck some stacking headers in between, and it still isn't really enough room.

Here's pics from Mr. Blurycam iPhone:

52  Forum 2005-2010 (read only) / Interfacing / Re: LED Control on: April 23, 2009, 11:35:12 am
All the multi-line character LCD screens I've seen are about the same, although some of the odd colored ones might be less readable.   I have a white on blue LCD that is sort of hard to read in some situations.  The normal black on green ones with a backlight seem very legible in a wide variety of situations.  The professional looking part comes from how you mount it in a case, and I've never done that smiley
53  Forum 2005-2010 (read only) / Interfacing / Re: LED Control on: April 22, 2009, 09:48:50 pm
I'd say try the software PWMAllPins route and see if it works for you.  It sounds like it works ok as long as you're not doing much else besides.  

The TLC5940 library is really great and easy to use, and they're not super expensive, if you need to do more processing than the software route allows.  I made a simple shield that uses two of them to drive 32 LEDs.
54  Forum 2005-2010 (read only) / Interfacing / Re: Arduino with Maxbotix LV-EZ1 ultrasonic sensors on: April 20, 2009, 06:24:25 pm
I was able to smooth out some of the noise using an averaging loop.  See here:
55  Forum 2005-2010 (read only) / Interfacing / Re: Addressing 192 LEDs at once with PWM. on: April 11, 2009, 12:13:50 pm
If you don't need I2C, you could look at the TLC5940. There's a fantastic library for it already in the playground.  You can chain them together to get more outputs.  I've only done 2 chips so far, I don't know if you'd run into any troubles with 12.

Read through the latter parts of this thread for lots of great info on that chip.
56  Forum 2005-2010 (read only) / Interfacing / Re: Using Multiple Shields Together on: April 11, 2009, 12:46:48 pm
I've not actually used one, so this is just from what I understand from reading about it a bit.  The shield doesn't give you more outputs, it just lets you connect to the pins here or there.  If you have two shields that both *need* to use digital pin 3 for example, you're still out of luck.  This shield just helps solve the physical problem of how do I fit them together.
57  Forum 2005-2010 (read only) / Interfacing / Re: Using Multiple Shields Together on: April 11, 2009, 12:17:26 pm
Liquidware makes a double wide extender shield that might work.  You still have to be careful about shields that want to use the same pins.
58  Forum 2005-2010 (read only) / Interfacing / Re: Sensor suggestions? on: March 30, 2009, 09:17:29 pm
{begin random untested idea}

Could you put magnets in the track, and use a Hall effect sensor placed in the train?  You would have to figure out a way to encode IDs into positions on the track.  Perhaps set a fixed length between two positive up magnets, and then vary the distance of a negative up magnet in between.  No matter the speed of the train, it should be possible to detect the positive magnet as a 'start' event, begin timing, and measure the time to the negative and end positive magnet.  Somehow those distances could be translated into an ID code, and transmitted back to the computer for processing.




{end random untested idea}
59  Forum 2005-2010 (read only) / Interfacing / Re: Using the ethernet shield to polling a URL on: March 16, 2009, 07:50:49 pm
Can you post your code?  The example only shows client.connect() being called once in setup.
60  Forum 2005-2010 (read only) / Interfacing / Re: Knob(s) for servo(s) on: March 08, 2009, 09:09:14 pm
Do you need to have both delays in there?  Wouldn't one delay at the end cover both servo's travel times?
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