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166  Forum 2005-2010 (read only) / Interfacing / Re: temperature sensors and relais on: December 11, 2008, 11:50:37 am
Thank you Bi0m3trics for reply!
seems very easy to use these devices. Do you have an idea how long can be the 1-wire bus in parasite mode?
Is it possible to run multiple 1-wire buses with just one sensor per bus?
I think the wires would be shorter.


A n00b question: If i put the Ethernet shield, the various Arduino input and output pins will be still free or some of them are used by the shield? In other words, is it possible to run both the Eth shield and the 1-wire bus?
167  Forum 2005-2010 (read only) / Interfacing / Re: temperature sensors and relais on: December 03, 2008, 11:01:03 am
I'm not an expert of TCP/IP but I suppose it's manageable when you have to send only few data like a temperature or a boolean value... it would be only one packet to manage.
But of course I'll start on serial smiley

It seems now it's a good moment to order the board and get dirty the hands a little bit.. then I'll ask you more smiley-grin

Thank you MikMo and Scootabug for replying!
168  Forum 2005-2010 (read only) / Interfacing / Re: temperature sensors and relais on: December 02, 2008, 08:43:34 pm
You're right.. it will be placed quite far from the PC controller and there's already an ethernet network in place.
I wonder if I can put the temperature sensors at least a few meters from the Arduino board or there's a need to keep together the thermocouple + temperature chip and reach the board with some digital bus or just an analogue voltage input (and i guess in this case I have to take account for the voltage drop)....
169  Forum 2005-2010 (read only) / Interfacing / Re: temperature sensors and relais on: December 01, 2008, 07:33:54 pm
Thank you MikMo!
You've understood exactly as I thought it.
What about the Ethernet shield module? As it's in mass production and already with a class in Arduino language, it should be quite easy to drive, altough not as a COM port...
170  Forum 2005-2010 (read only) / Interfacing / temperature sensors and relais on: December 01, 2008, 09:30:26 am
Hello everybody!
I'm about to start my first project with Arduino board, but before beginning I'd like to know if it's feasible and how much knowledge it requires.

I need to read from a VB.net software through Ethernet connection three temperatures from sensors located several meters from the board, as well as driving four low current relais.
I'd like to know:
- can i do it with one board?
- from a sketch programming point of view is it much complicated to transmit via Ethernet than USB?
- which sensor do you suggest? I read about LM35 and AD595. Remember the thermocouple must be placed severa meters from the board, need 0.1°C precision and the least complicated circuit - after all it's a DIY project smiley

Thank you for the help!
171  Forum 2005-2010 (read only) / Interfacing / Re: Does this cheap 2-line LCD work? Datasheet inside on: January 08, 2009, 09:59:10 am
Thank you Skumlerud for the quick reply smiley

I'm a total n00b in these things... but according to the datasheet (PDF page 13, Function set) it seems the one/two line display bit is sent to the DB3 line, which is not connected when using 4-bit mode.
But in the example it seems it sends the first 4 bits and then the last 4 bits to set line/character mode.

Do I have to manually write the code for this or it's taken care by the libraries for LCD modules?
172  Forum 2005-2010 (read only) / Interfacing / Does this cheap 2-line LCD work? Datasheet inside on: January 08, 2009, 07:03:38 am
Hello everybody
I found a really cheap 2x16 LCD module with HD44780-like controller.
This is the datasheet which clearly explains it can be used with 4/8bit mode.

http://www.datasheet4u.com/download.php?id=626872

I can't understand if you can use both two lines while using 4 bit mode.
Which arduino pins would be free if I use 8 bit mode?
173  Forum 2005-2010 (read only) / Interfacing / Re: Dim laser – where's the resistance? on: December 14, 2008, 09:34:10 am
what can you do with a high-speed flash trigger? Is it for special light effects?
174  Forum 2005-2010 (read only) / Interfacing / Re: DS18S20 Temp Resistor? on: December 14, 2008, 05:07:43 pm
thank you for all the replies about 1-wire distance and wires smiley
seems i'll give a try to telephone cable, since it's cheap and have a small section. Plus the telephone tubes of the electrical system are almost empty.
But retrolefty pointed about ring signal interference. Is it better to use a shielded twisted pair?

Can one arduino board manage multiple 1-wire networks? If I understood correctly they just use one digital output... but maybe the library can't.
175  Forum 2005-2010 (read only) / Interfacing / Re: DS18S20 Temp Resistor? on: December 13, 2008, 04:19:02 pm
what kind of cable do you suggest for a 1-wire network? especially if it's fitted inside an existing electrical system. How long can it be?
I was wondering about coaxial cable used for satellite antennas....

What about DS18B20? It's supposed to have 0.0625°C precision right?
176  Forum 2005-2010 (read only) / News / Re: News of Rainbowduino V1.0 on: September 21, 2009, 07:35:13 pm
Two questions about Rainbowduino:

- is there a unused digital pin from the ATMEGA168 to carry Maxim 1-wire protocol? I would use it as a slave device.
- can I group the constant current outputs to drive one or two 3W RGB LED? It's 350mA on green, blue and 220mA on red.
177  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: HOW TO STORE RECORDED VOICE(1 word) ON ARDUINO? on: March 01, 2009, 09:29:22 am
you should use something like the Fonera 2.0, which has a much more powerful ARM processor, 32MB of ram, dd-wrt linux, serial pins, and USB port. Let us know if you make something with that, cause I've heard of fonera+arduino hybrids
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