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3046  Forum 2005-2010 (read only) / Interfacing / Re: i2c port expander PCF8574 as input on: October 30, 2009, 11:39:15 am
I will be absolutly fine with a normal digital button smiley
I need this button to change the state of the visualization on the lcd, but looks like every example on the forum is about using the expander as output, and not as input (on a single pin)
3047  Forum 2005-2010 (read only) / Interfacing / i2c port expander PCF8574 as input on: October 30, 2009, 10:17:48 am
Hi, I have a PCF8574p and I am using it with an lcd. This works fine.
The library that I use let a pin of the PCF, the 13, free.
I wish to use this pin of the port expander as an input pin, to read the pressure of a button, but I can't understand how, through the wire library (i think that i need this).
Is it possible to do this? Does anyone knows where I can look for understanding how to do this? Thanks, Fede
3048  Forum 2005-2010 (read only) / Interfacing / Re: DS1307 rtc hang-up on: June 02, 2009, 06:50:14 pm
Thank you, I will try also a smaller cap, to see what happens!
Federico
3049  Forum 2005-2010 (read only) / Interfacing / Re: DS1307 rtc hang-up on: June 02, 2009, 02:59:22 pm
Hi!
Basically my scheme looks like this
http://img89.imageshack.us/img89/6505/ds13070sm4.gif
with the pullup resistors.

During the last hour, things started to work. Looks like...
I have the system in test because is running by one hour, and I am continuosly detaching the current and keep working.

I have added an electrolitic capacitor, 10uF 25v beetween the vcc and gnd of the ds1307 and now looks like working. Don't know exactly WHY, by the way. I tested just because I was without any other idea, and looks like a solution. (Well, if this keep working)

Can't understand why...
3050  Forum 2005-2010 (read only) / Interfacing / DS1307 rtc hang-up on: June 02, 2009, 12:16:00 pm
I have tried everything and I can't understand this. I have a ds1307 rtc, the right crystal and a battery. Everything apparently works fine.

When I try the battery, to see if everything works,  I detach the VCC cable from the pin8 on the ds1307 and when I attach it again I see that the battery works, because the time is exact.

Looks like ok BUT.. When I detach the +5 cable from the arduino (meaning that breaks the connection with pin 8 VCC, 5 SDA,6 SCL) and I attach it again, most of the times (but not every time) the RTC hangs and show always the time when i gave again the +5. (Looks like hanging in the exact moment that I put the +5)

I am working on this from many hours, without understanding why it stop working...

Thank you for help!
3051  Forum 2005-2010 (read only) / Interfacing / Re: rgb led from seeedstudio - red is dominating?! on: June 02, 2009, 03:14:47 pm
I haven't tried the leds from seed studio, but I had this problem with RGB leds when there was not enaugh power. Try to give more power to the led!
3052  Forum 2005-2010 (read only) / Exhibition / Re: robots band on: January 20, 2011, 09:19:15 am
FANTASTIC!!!
I like it a lot!
Do you have extra pics of the work in progress??
Fede
3053  Forum 2005-2010 (read only) / Exhibition / Re: Saying "Hi!" with my current project on: January 04, 2011, 09:29:22 am
Can I ask you a thing about the futaba s3003? With a bit of try and error I ended that they go, in microseconds, from 500 to 2400. Have you ever tried?
3054  Forum 2005-2010 (read only) / Exhibition / Re: ArduSpider Sara : a robot project for my daughter on: January 10, 2011, 04:45:07 pm
Super super super cool. You are great!
3055  Forum 2005-2010 (read only) / Exhibition / Re: 2-Axis bot with laser pointers - servo driven on: January 09, 2011, 11:14:08 am
Damn your motos are COOL. Mine are http://www.servocity.com/html/s3003_servo_standard.html, way more economical! I was reading this post with my brother that helps me with C code and he said "now i understand why his movements are so smooth and ours are not!" :-)

by the way, I am noticing that those s3003 servos have some jitter by thefault, this is driving me crazy because sometimes I don't understand if it's our code or it's the servo. They are ok only for testing or for limited applications...
3056  Forum 2005-2010 (read only) / Exhibition / Re: 2-Axis bot with laser pointers - servo driven on: January 09, 2011, 11:09:18 am
I started to experiment because I have seen that there are not so many howto's about accelerometers and I have found that somethimes they are wrong too  :smiley Right now I am working on the same thing but with less error in reading, hopefully less jitter and so on. Code is starting to be huge  :o
But I like that turret and could be cool on my project too. In truth I don't have any final usage, I'd wish to go into robotics but for the projects I like servos are way expensive so I was using this as a training...
3057  Forum 2005-2010 (read only) / Exhibition / Re: 2-Axis bot with laser pointers - servo driven on: January 09, 2011, 10:19:52 am
Hi, nice work I like it a lot, I never used such a good structure to drive my motors smiley During the last test with my accelerometer I shot this video

[media]http://www.youtube.com/watch?v=lpz7k-Sqz6s[/media]

so you can see how cool your is smiley
I am planning to shoot another video of the same work but working with writeMicroseconds because I can have a smoother movement. I have a couple of futaba s3003 servo. With a bit of trial and error I have decided that those motors start from 500ms till 2400ms, centered in 1450, but I could be wrong. The only method I know is to try, verify and try again.

When moving in degrees or microseconds you can slow the servos by putting a delay between every step. I think that you can use up to 15milliseconds if you move in degrees or up to 2 in microseconds, but those values depens from motor to motor.

Fede

ps: wich motors / servos do you use?
3058  Forum 2005-2010 (read only) / Exhibition / Re: 2-Axis bot with laser pointers - servo driven on: January 07, 2011, 02:36:44 pm
video video !!
3059  Forum 2005-2010 (read only) / Exhibition / Re: MARD · Alarm / Alarma Arduino MEGA on: January 10, 2011, 02:08:04 pm
Looks like he posted in both languages!
3060  Forum 2005-2010 (read only) / Exhibition / Re: 16x4 "pixel" display on: January 06, 2011, 03:41:44 pm
A picture?
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