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106  Using Arduino / General Electronics / Re: conductive ink on: September 19, 2011, 11:01:07 pm
http://hlt.media.mit.edu/wiki/pmwiki.php?n=Main.PaperCircuits

Is there any way I can do something like this using Arduino? Also, can I paint my circuit on wood?
107  Using Arduino / General Electronics / conductive ink on: September 19, 2011, 10:59:09 pm
I really want to make something using conductive ink. I just went to Maker Faire and there was some project in which the resistance of the ink was determined by how wide the swath of ink was, and some object was waved over it—the object had two electrical poles, power and ground—and funny sounds were produced. The whole thing was connected to an Arduino. Anybody have any insight? Anybody know any good tutorials?
108  Using Arduino / General Electronics / Re: lots of noise in circuit on: September 16, 2011, 01:00:58 am
I tried connecting capacitors to ground to reduce the noise, but that didn't help.
109  Using Arduino / General Electronics / lots of noise in circuit on: September 16, 2011, 12:59:28 am
I have a circuit on a breadboard that uses push buttons and an IR sensor.

The values of the IR sensor read by the Arduino pin are consistent for the most part, but every now and then it jumps.

The push buttons will sometimes change by themselves, without being pressed, or they'll be very, very difficult to press. I checked the wiring and the code a million times—everything works fine, it's just that it's behaving very erratically, and the buttons are really difficult to press. Also, even though I have one of the buttons connected to pin 4, it sort of works on pin 3 as well (and in my code, pin 4 is designated for that button).

Is this a noise problem? How can I fix it?
110  Using Arduino / General Electronics / Re: chronodot on: September 10, 2011, 08:50:37 pm
Never mind, I used Ron C's sketch to set the time and it works fine. Thank you both for your help though! I'll probably be asking you more questions about this sometime in the near future. I really appreciate your efforts! smiley
111  Using Arduino / Motors, Mechanics, and Power / Re: motor speed question on: September 10, 2011, 08:27:43 pm
By shaft speed, do you mean the speed at which the little shaft sticking out of the motor rotates?

What is the gear ratio?

This is a DC motor, I'm pretty sure. How would I go about changing the speed? Also, if this is relevant, I plan on getting or making an H-bridge, because I need this motor to be bi-directional.
112  Using Arduino / Motors, Mechanics, and Power / motor speed question on: September 10, 2011, 08:16:19 pm
I have a motor that rotates 5 times per minute. I'm using it to lower a small object using a pulley. At the motor's current speed, that object gets lowered approximately 1.3 inches per minute. Is it possible for me to control the motor's speed so that it takes twelve hours to lower that object about three feet? Do motors that slow exist?
113  Using Arduino / General Electronics / Re: chronodot on: September 10, 2011, 08:07:09 pm
CrossRoads, here's the attachment I forgot to send you. Sorry!
114  Using Arduino / General Electronics / Re: chronodot on: September 08, 2011, 12:34:45 pm
How do I do that? I tried using the script and library I found on this site, but to no avail: http://www.radekw.com/blog/2011/01/09/connecting-chronodot-and-setting-the-time/
115  Using Arduino / General Electronics / Re: chronodot on: September 08, 2011, 12:14:18 pm
Thanks so much! I feel so derpy for not realizing that. It works now.

However, I'm confused by the data that it's spitting out. I posted a screencap. Shouldn't it be getting the exact time?
116  Using Arduino / General Electronics / Re: chronodot on: September 08, 2011, 01:37:12 am
Thanks retrolefty. Here's what I got…I'm attaching a screencap to this message.

I'm also attaching a picture of what I have wired up; maybe you guys can tell me if I got anything blatantly incorrect?
Also, there are two places that say R1 and R2 as you can see here in this image: http://www.adafruit.com/images/medium/ChronoDotV2_MED.jpg do I need to solder 10K resistors into those holes?
117  Using Arduino / General Electronics / Re: chronodot on: September 08, 2011, 01:05:14 am
Thanks, I tried using 10K resistors. I simply connected one leed on each resistor to the VCC rail of my breadboard and the other leeds to the SDA and SCL pins. No results. Do I actually need to solder the resistors onto the Chronodot board?
118  Using Arduino / General Electronics / Re: chronodot on: September 07, 2011, 04:23:28 pm
My wires were connected to the correct pins.
119  Using Arduino / Motors, Mechanics, and Power / DC motor noob here on: September 07, 2011, 04:22:14 pm
Hello all,

I'm working on a project that uses a DC motor, and I know next to nothing about using them in tandem with Arduino.

Here are some basic questions:
- How can I control the motor's speed?
- How can I control the direction in which the motor moves?
- I want to write a program in which the user can input a value using push buttons and an LCD screen, and then I want to be able to calibrate the motor's speed using those values. How can I do that?

Thanks!
120  Using Arduino / General Electronics / Re: chronodot on: September 07, 2011, 03:43:31 pm
Thanks. I wired the SDA and SCL pins to A4 and A5, respectively, and I wired the VCC and GND pins to power and ground on my breadboard, respectively. I uploaded their example program and opened the serial monitor, but I'm not getting any data. Do you have any idea what the problem could be? Do I need to wire any of the other pins on the Chronodot?
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