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1  Using Arduino / Sensors / Re: How to shortcut pwm and analog pins on: May 26, 2013, 06:39:32 pm
Thank you! I'll give it a try
2  Using Arduino / Sensors / How to shortcut pwm and analog pins on: May 26, 2013, 03:41:04 pm
I connected an Arduino output (pwm) pin to the gate of a mosfet. The same gate is connected to another circuit (with its own logic, common ground with the arduino) that can source power in the 0/5V range.
Despite i'm not sure the Arduino board is safe with this connection, I already tried to power it up and everything seems fine and work as expected.

Now Id like to extend my setup with the possibility to read the voltage level on the same mosfet's gate. My first thought was to connect an analog pin directly to the gate but before doing that I realized that I'm trying to read an analog value on a square wave, hence my reading would always be either very near to 0 or very near to 1024. I read somewhere that I need a low pass filter to do so. Do you have any advice on the resistor and capacitor I need, in order to achieve a nice measure?
Also can I connect the analog pin straight to gate ( causing a shortcut between the pwm and the analog pin ) or I risk to damage the board? What about simply adding a resistor?

p.s. I'm quite sure I already read something about this but I couldn't find it anymore!
3  Using Arduino / Networking, Protocols, and Devices / Re: Xbee with Arduino shield problem: anybody successful can comment? on: March 09, 2011, 06:55:02 pm
Thanks for the tips guys!
Things are working out (at least for my case); was a combination of RX and TX on the shield, as well as some AT commands for the Xbee.
I'm preparing a small note that I'll put up some time this weekend (when I'm free from classes!)... with a general layout of steps to use for this kind of setup, for permanent reference.

thanks for the notes !

my setup:
1 - sparkfun xbee explorer usb + xbee znet 2.5
2 - sparkfun xbee arduino shield + xbee znet 2.5 (arduino duemilanove)

node 2 is the coordinator
i could transmit from 1 to 2 but not vice versa  smiley-roll
also I couldnt succesfully use the unchipped arduino to program the xbee with x-ctu software  smiley-cry

4  Forum 2005-2010 (read only) / Italiano / Re: Domotica con Arduino on: September 22, 2010, 07:09:05 am
io intanto mi sono ordinato la coppia relay indicata da pitusso, per sperimentare con quelle. La soluzione con shift register di astroz mi sembra comunque doverosa per lasciare iberi i pin per i sensori, ma io non sono assolutamente in grado di disegnarne il circuito. ( come alimenti l'ULN2803A ? dalla 220V o da arduino? )

Qualcuno potrebbe disegnare il circuito di astroz ? magari usando fritzing, così si può mettere nel playround
5  Forum 2005-2010 (read only) / Italiano / Re: Domotica con Arduino on: September 20, 2010, 04:50:57 pm
@astroz complimenti per il tuo impianto. Da quanto ho capito hai implementato il can bus.
Per piacere potresti indicare il nome commerciale degli attuatori/relè che hai utilizzato e come li controlli tramite i pin a 5V di arduino ?
6  Forum 2005-2010 (read only) / Troubleshooting / arduino2max november 2010 build. can't get data on: December 17, 2010, 01:14:07 pm
hi everybody,

I am using arduino2max version november 2010 (downloaded here to get analog data from some eowaves sensors (ir, touch, ribbon such as this
Everything worked just fine until now. it suddenly stopped showing pins data in max (each pin remain at value 0, rx led blinking couse of max sending 'r' char for reading). I can see the data only by using the serial monitor in arduino software. this board appears to behave normally besides the fact that pins data won't show up in max.
What is strange is that by using another arduino board with the same atmega chip it worked. That leave me thinking that something is wrong with the ftdi chip (i'm using latest driver) or with the board itself. is it possible to "listen" the serial comunication from arduino to max by another arduino (i.e. arduino sensig tx pin on another arduino transmitting serial data via usb)? anything to try?any pointer to some arduino/atmega debugging techniques? many thanks in advance!
7  Forum 2005-2010 (read only) / News / Re: How to pronounce "Arduino" ? on: November 02, 2010, 08:12:26 am
According to a recent article from wired magazine (in italian)
The board was named after a pub in the surroundings of the Interaction Design Institute, Ivrea , Tourin , Italy.
Obviously Arduino is not just a pub's name, it's a proper (not so common) noun!

Arduino is still used as a name and surname, in Italy and probably in most european countries. Infact according to a great italian site for name and surnames (in italian) :
"It comes from the germanic name, Harduwin or Hardwin, made by hardu-, "strong" and wini, "friend", spread by the tribal population of the Franks  in the IXth century, consolidated thanks to  the prestige of few saints and the Italian king Arduino d'Ivrea (1002-1015).
The name day can be celebrated the 15th of august in memory of Saint Arduino from Rimini, died in 1009."

As of today this noun has more spread use as a surname
As you can see from the graph here

The name has even more wide spread use when meaning our lovely microcontroller , so let's take this for the first, most important, meaning of the word Arduino !
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