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31  Forum 2005-2010 (read only) / Interfacing / Re: Wire.h and pin 13 on: November 21, 2006, 11:59:50 am
> Haven't tried with the resistors yet

You should! The I2C bus won't work without them. Dedicated I2C hardware might already have them built in, but the Arduino definitely doesn't.

32  Forum 2005-2010 (read only) / Interfacing / Re: Keypad PCB on: March 05, 2007, 05:35:40 am
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1162143867/0

Many examples can be found on google when you search for Arduino and keypad, too.
33  Forum 2005-2010 (read only) / Interfacing / Re: Speed control for variable voltage motor on: March 05, 2007, 05:30:06 am
The Arduino doesn't put out enough juice to drive a motor. You cannot hook one up directly to the output pin. Try this instead:

http://itp.nyu.edu/physcomp/Tutorials/HighCurrentLoads
http://itp.nyu.edu/physcomp/Labs/DCMotorControl
34  Forum 2005-2010 (read only) / Interfacing / Re: H-Bridge + motor speed control on: February 28, 2007, 07:44:17 am
I seem to remember that servos can be modified for continuous rotation, and speed can then be controlled by the position signal duration.
35  Forum 2005-2010 (read only) / Interfacing / Re: LED Sensor on: January 17, 2007, 12:40:12 pm
http://www.merl.com/reports/docs/TR2003-35.pdf has instructions for doing this with microcontrollers.

http://www.instructables.com/id/E6PN27M4CPEP286H58/ uses LEDs as light sensors too. I like that one a lot.  smiley
36  Forum 2005-2010 (read only) / Interfacing / Re: More interrupt pins on: January 14, 2007, 03:31:59 am
Seems like the Atmega 168 is soldered in place and cannot be removed anymore.
37  Forum 2005-2010 (read only) / Interfacing / Re: shield sanity check on: January 10, 2007, 01:25:18 pm
It seems to be 4mm. So about 1mm less than the normal 2x0.1" spacing.
38  Forum 2005-2010 (read only) / Interfacing / Re: rotations sensor on: January 05, 2007, 04:18:42 am
You can also build them yourself. A wooden base with a small hole in it, a steel ball (with a considerably bigger diameter than the hole) and two wires/nails arranged in an X shaped "dome" surrounding the ball.  
 
When undisturbed the ball rests on top of the hole, not touching the wires. When you tilt this thing the ball will roll against the wires and make contact between them.
Don't have a picture of this contraption, I hope the explanation made sense.
39  Forum 2005-2010 (read only) / Interfacing / Re: rotations sensor on: January 04, 2007, 10:15:38 am
> I stopped using them when I found out what a serious environmental hazard they are

You need to put things into perspective. If you reuse these switches and properly discard them at the end of their life there is nothing wrong with them. The amount of Hg that humans have already spread in the environment and continue to spread is enormous. You contribute to that simply by being alive and using industrial products.
If you are totally against using Hg then you cannot use fluorescent tube lamps either. What do you do with them once they cease to work? Properly dispose of them, or do you simply throw them into your regular household trash? What if you break a few of them (or even a Hg filled thermometer) inside your house? Do you evacuate the building and move out?

Anyway, I'd consider using a three axis accelerometer.
40  Forum 2005-2010 (read only) / Interfacing / Re: DIY Touch Sensor on: December 31, 2006, 04:33:16 am
Qprox Capacitive Touch Sensors (includes code)
http://www.tigoe.net/pcomp/code/archives/arduino/000331.shtml
41  Forum 2005-2010 (read only) / Interfacing / Re: Analog pin sensitivity on: December 12, 2006, 03:07:05 am
Quote
Because I'm trying to move the mouse on the screen, even if I get the op-amps to improve the signal I still only have 1024 different values on X and Y axes. With PC resolutions going easily up to 3200x1200, I would need more than that to get 1 pixel accuracy.

An acceleration sensor will not produce absolute position data, like x-y coordinates. It will rather produce data about the rate of change. A big difference! That's one of the reasons why 10 bit resolution should be absolutely sufficient for this purpose.
42  Forum 2005-2010 (read only) / Interfacing / Re: Analog pin sensitivity on: December 10, 2006, 02:16:43 pm
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1165656828/1#1
43  Forum 2005-2010 (read only) / Interfacing / Re: SD/CF cards on: December 06, 2006, 02:57:24 am
If your boss is interested in small, lightweight data loggers for RC airplanes you should show him these links. They will make him drool!

http://members.aon.at/w.walter/page_4_1.html
http://home.arcor.de/d_meissner/d_logg2_engl.htm
http://www.sprut.de/electronic/soft/skyplot.htm
44  Forum 2005-2010 (read only) / Interfacing / Re: Strange LED Sensor like behavior  (Video on: November 26, 2006, 07:20:02 am
Nice! I like that a lot!  smiley-grin
45  Forum 2005-2010 (read only) / Interfacing / Re: Proto Shield v.1a questions on: October 26, 2006, 03:31:42 am
Thanks massimo. The shield pictured above (v.1a) has a different layout than the one on Tom Igoe's site, and it says R1 and R2 on it while the resistors are called R1 and R7 on the shield on Tom's site. So I was going back and forth between all the different shield and Arduino board schematics, trying to make sense out of this.

Another thing which threw me off a little seems to be an error in the silk screening of the proto shield:


In the picture above the row of holes on the left says GROUND while they are actually connected to 5V, and the row on the right (which is supposedly +5V) is in fact connected to ground.
If you look carefully you can see the trace on the board going from the 5V pin on the bottom, underneath the printed word POWER to the vertical GROUND row on the left.

Me so confused!
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