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1  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: Add to Reference for LiquidCrystal w/ 4 data lines on: January 21, 2009, 04:35:10 pm
I have the same square blocks on one row...
it's the same when you do the proper connections and when you power up only the LCD and the backlight.

My LCD is this one
2  Forum 2005-2010 (read only) / Syntax & Programs / Re: String + integer  - Sorry for this on: January 31, 2009, 04:08:22 pm
it's easy to send different data formats to the serial port, just send them one by one.
But it's not feasible if you want to put everything to a string then send to a LCD module.
I found if you want to append text to an existing string you have to use strcat(string,value)
but how can i convert an integer to a string before appending it?

I tried the itoa function but it seems the arduino freezes with this instruction, even if it gets compiled. And I don't know anything about C++

In VB all of this would require this thing...

temperature = temperature + str$(value)
3  Forum 2005-2010 (read only) / Interfacing / Re: Arduino and 1-wire on: March 05, 2009, 03:42:40 pm
Anyone have used DS2406 switch or similar with OneWire library?

Please help, have a look on my post here

4  Forum 2005-2010 (read only) / Italiano / Re: Progetto Domotica Open Source basato su Arduino on: January 12, 2009, 06:16:30 pm
bel lavoro, ma si può anche accendere o spegnere il carico?
come mai non si può leggere sotto i 70 watt?
io ho preso un wattmetro digitale da pochi euro, ha una risoluzione notevole, 0.1 watt... se vuoi lo apro e guardo cosa c'è dentro
5  Forum 2005-2010 (read only) / Italiano / Re: Workshop a Torino nei primi mesi del 2009 on: January 12, 2009, 06:18:36 pm
grazie Massimo per le news....
solo che io il workshop kit l'ho già comprato, ero impaziente di smanettare smiley-grin
6  Forum 2005-2010 (read only) / Italiano / Re: Workshop in Italia ? on: December 01, 2008, 06:43:07 am
potrebbe interessare anche a me.... anche se è chiaro ormai che non si fa più a novembre smiley
7  Forum 2005-2010 (read only) / Italiano / termostato collegato via ethernet on: December 01, 2008, 07:08:06 am
Ciao a tutti!
Vorrei cominciare il mio primo progetto Arduino, mi sto leggendo tutto il forum e il sito... nonchè ordinato il libro per cominciare.
Si tratta di un termostato da gestire via software tramite Ethernet, giusto per non complicarmi la vita con pulsanti e display led...
Il termostato dovrebbe avere 3 sensori di temperatura e pilotare tre relais. Adesso sono in fase di ordinazione delle componenti.

Domande per valutare la fattibilità della cosa:
- E' possiible fare tutto ciò con una sola scheda?
- è parecchio complicata la comunicazione con un PC tramite ethernet rispetto a quella USB? Non parlo di pacchetti TCP ma a livello di programazione Arduino.
- cosa consigliate come termocoppie e come relais, i più semplici come circuito e gestione sw, pur mantenendo una buona precisione?
Ho sentito parlare molto dell'LM35, però ha una precisione di soli 0.5 °C. E invece l'AD595?
8  Forum 2005-2010 (read only) / Interfacing / Re: DMX woes... on: February 05, 2009, 04:33:18 am
Just for the sake of curiosity, I knew DMX is a protocol to control complex lighting. What can you do by receiving and not sending it?
9  Forum 2005-2010 (read only) / Interfacing / Re: Arduino/L298 schematic on: March 05, 2009, 08:47:18 am
I'm using a L298 too but with a normal brushed motor.
just put it in a digital pin, then you made a digital write HIGH or LOW if you want to turn the motor on or off.
I wonder if you could put two diodes that run from the input pins to the enable pin and then save a pin on the arduino.
It's assumed that if you have at least one of the input pins high, it means that you want the motor running smiley-grin
10  Forum 2005-2010 (read only) / Interfacing / Re: Arduino as a 1-wire slave device on: November 18, 2009, 12:11:29 pm
This would be really nice, I'm building a 1-wire network and it's a pity I couldn't use Arduinos as slave devices.
However you could use a DS2408 that have 8 I/O pins and hook them to the Arduino. For many applications even 4 could be enough
11  Forum 2005-2010 (read only) / Interfacing / Re: connect to a entry phone on: January 20, 2010, 10:07:04 am
Thank you Tkbyd for the reply
It's the first idea I've come up with... but it works only if the office it's an open space. Unfortunately there are a few rooms you couldn't hear the speakers, plus you have the problem to connect them to a relay with a timer otherwise you hear street noise all the time.

My idea is to send an alarm to all the clients when the Arduino senses the buzzer, and broadcast the audio via software (Windows Media Server I think) digitalized by the server audio card. But I don't want to fry the audio card or, worse, the server!  smiley-razz
12  Forum 2005-2010 (read only) / Interfacing / connect to a entry phone on: January 20, 2010, 05:32:43 am
Hello friends
I'd like to connect the entry phone of the office I'm working to a PC to let everybody hear who is ringing, reply and open the door without moving from the desk.
The buzzer/door relay part is controlled by Arduino of course, using optocouplers.
The big question is, how to connect the audio lines to the PC sound card without frying it?
I know the buzzer works at 12V AC, but don't know if it's the same on the audio signal. What kind of measurement should I make? Screaming to the phone and take the highest voltage?  smiley-grin
13  Forum 2005-2010 (read only) / Interfacing / Re: Arduino and camera/webcam on: November 25, 2009, 01:08:53 pm
go and get a fonera 2.0!
it costs 40 euros, have a ARM9 150 Mhz processor with 32 MB RAM, USB host and Linux. You can connect a USB webcam and process the images on that with OSS software.
Plus you can connect Arduino through USB port or internal serial port and have all the I/O pins that makes Arduino so wonderful!

Even a C64 have more RAM than Arduino, you would have problems working on still pictures, let alone video feed
14  Forum 2005-2010 (read only) / Interfacing / Re: Hi Power HBridge, DC Motor on: February 24, 2009, 05:37:00 am
Retrolefty: yeah you're right, less is better smiley
If I use both outputs for the same motor, is it still possible to link the two sense pins, to use just one arduino pin?

Anachrocomputer: interesting pic! On the datasheet they say to use 1A fast recovery diode (trr <200ns). Is it ok the 1N4001 diode? I found also the 1N4936RLG which is much cheaper.
Can I use diodes to save the enable pin? I mean, the enable pin is high when one of the two inputs are high.

Is there an easy way to override the enable pin when a certain voltage threshold has been exceeded?
Otherwise, what are the risks of having a stalled motor for a few seconds?
15  Forum 2005-2010 (read only) / Interfacing / Re: Hi Power HBridge, DC Motor on: February 23, 2009, 08:07:44 pm
I patiently soldered the wires and made a simple demo that enables the enable pin and then cycle the inputs.... it's so funny to see the motor changing direction then turn off thanks to the Arduino... IT WORKS!!!

What's the purpose of the 100nF capacitors? I read it's better to place them close to the GND pin.
For SENSE pin I read on another forum you should use a small value resistor like 0.2 Ohm to lower voltage drop, then use an op-amp to raise the voltage, allowing a more precise ADC conversion. Is it right?

BTW the heatsink + some paste is a must!
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