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1  Using Arduino / Project Guidance / Re: Peltier heater Cooler changing current direction on: February 02, 2014, 04:59:55 pm
I have never used an H-Bridge. can you do pwm with it?
and do you need anything other than the h bridge?
2  Using Arduino / Project Guidance / Peltier heater Cooler changing current direction on: February 02, 2014, 03:54:07 pm
Hi,
I want to built a pretty simple project with one peltier element where I can regulate the heat/cold with a pwm signal. which is so far pretty easy with one n channel mosfet and a 10k resistor. (http://garagelab.com/profiles/blogs/how-to-use-a-peltier-with-arduino)
I tried it and it worked perfectly.
My problem is I want to be able to change from heating to cooling on the same side.
I found something which looks pretty similar to the thing I want but unfortunatly it's only a picture from fritzing without any explanation or part list. (http://www.arduino-tutorial.de/2010/08/peltier-element/)
has anyone done it before?
and can share a simple schematic.
3  Forum 2005-2010 (read only) / Interfacing / Re: multiple RS232 signals on: July 08, 2010, 09:10:30 am
one line is one set of data! one line contains 54 characters.
the timestamp says if i get it right mm.dd.yyyy hh.mm.ss
rom the first to the second line the timetiffrence is 10 seconds.
in the manual it says that the converter uses 9600 as baudrate.

@tkbyd: If i understand correctly you mean that I should use like analog multiplexors. receive one signal switch to the next etc.
If I got this right with the timestamp I would get the signal from each converter every 400 seconds. Thats a pretty long time between signals.
and asuming that they  give the signal exactly at the same time.
4  Forum 2005-2010 (read only) / Interfacing / Re: multiple RS232 signals on: July 08, 2010, 03:27:22 am
The Data from one converter via rs232 looks like this(handbook):
Code:
00.00.0000 00:05:30 4 363.8 0.37 134 226.1 0.53 103 23
00.00.0000 00:05:40 4 366.0 0.39 142 226.1 0.53 112 23
00.00.0000 00:05:50 4 359.5 0.41 147 226.1 0.53 116 23
00.00.0000 00:06:00 4 369.8 0.42 155 226.1 0.58 118 23
so I guess from the times its every ten seconds. (the second column is the timestamp)
The Converters are all in one place (the first is like 25meters from the last(which is like 27yards)) I got an arduino plus an ethernet shield. I wrote a client program which can successfully send data to a server via internet.
The "only" thing I got a real problem(still in planing phase) is to get all the signals to the arduino, cause I dont want to set up 40 arduinos.
5  Forum 2005-2010 (read only) / Interfacing / Re: multiple RS232 signals on: July 07, 2010, 04:36:36 pm
I want to get data from DC/AC Converters which are far away from home(like 200miles) prepare the data on the arduino and send it to my home server.
I couldn't find anything like a call/response system. it's probalbly each one sends it whenever it wants to.
Isnt there an atmel mikrocontroler(or any other ship) which can receive lots rs232 signals convert it into a new format(for all convertors) and send one to the arduino?

Edit: the traffic is pretty low like 50-80 characters per transmitted data set.(per converter)
6  Forum 2005-2010 (read only) / Interfacing / multiple RS232 signals on: July 07, 2010, 10:43:50 am
Hi,
I want to recieve data from a bunch of devices mith an RS232 output. my problem is I dont have any idea how to connect more than one RS232 signal to the arduino and when I say a bunch I really meen it between 20 and 40 devices!

There is an alternative the devices have an RS484(I hope I remember the correct number) which should be able to tack them. gut I dont know the signal how its comming and how its formatted or anything so I'm probably stuck with a bunch off rs232 connections.
7  Forum 2005-2010 (read only) / Exhibition / Mindmap for new project asking the status of BiLED on: April 17, 2010, 06:48:05 am
Hi I have some devices which need to be monitored. So I thought why not using my arduino.
First the device I whish to monitor cant be dissassembled due to warranty issues. It gives it status by two bicolored(Red/Green) LEDs.
Green means everything is OK. Red means something went wrong and needs to be fixed asap. and off means device is off(which might be bad during working time).
My first idea was tojust check for red by gluing a spectral filter over the leds(no idea where one can get such a thing) and gluing a fotodiode to it.
The Problem is that with this idea I can't get the green status anymore.
has anyone an idea how to fix this Problem.

My second Problem is that I got a bunch of those devices which need to be monitored scattered over an area of 15*6meters so worst case scenario would be a sonsor cable with a length of 36 meters.
Is it possible to read a photodiode over a 36meter cable?

The third problem I need to check the status of 42devices with 2 bicolered leds each. I dont think that is even possible with one arduino duemillanov? Or could one use a bunch of shift registers or something similar to make it work?

My Idea to solve the 3 status LED problem is that I heard one could use a regular led as an photodiode. so a red photodiode should give a higher signal when recieving red light.
Is that even true?
If its true one could even use duoleds(green/red) to read the status?

Thanks for your comments and ideas.  
8  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Ethernet Shield. Communication over the internet. on: July 07, 2010, 10:35:48 am
Thanks I got it working right before I decided to do it the other way around and use the arduino as a client^^
9  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Ethernet Shield. Communication over the internet. on: June 08, 2010, 08:56:17 am
I mean the changing sensor values.
could you tell me how you put the canging values in a page If done a small html code on my arduino but i need to reload evrytime I want to see a change.
thanks
10  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Ethernet Shield. Communication over the internet. on: June 08, 2010, 07:29:19 am
I found the option to portforward an ip which has no device and it works just fine :-) and with dyn dns it works perfectly. :-)

Now a new question arises.
Is it possible to make a dynamic html site with the arduino?
11  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Ethernet Shield. Communication over the internet. on: June 07, 2010, 04:21:52 pm
the problem is I cant do portforwarding for the arduino on my router. It wont show the arduino as an device. an one can only do portforwarding vor an device. odly I can access the arduino over the lan where the router is the central switch.
Do you mind to release your code
12  Forum 2005-2010 (read only) / Frequently-Asked Questions / Ethernet Shield. Communication over the internet. on: June 07, 2010, 04:01:11 pm
Hi I bougt the magnificent ethernet shield and put the webserver on my arduino. works just fine in my LAN. but I don't know how I can access my arduino over the internet. I think the problem is that I got a router(AVM FritzBox).

I want to built a sensor which gives me weather data over the internet. Where I can get graphs for last month last year etc. The Atmel chip is probably to small to store all this data. So My second question is how would you do it? Store data until its called from a home computer or a server? The best thing bwould be if one could put a flash card in the arduino like 4 gig an be done but I read that you cant use the Memory port and the Ethernet?
or can you switch back and force the whole time?
thanks
13  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Analog Input on: April 25, 2010, 10:57:52 am
could you explain to me what an analog multiplexer is? And if the Arduino board is able to use those and the ethernet shield?
thx
14  Forum 2005-2010 (read only) / Frequently-Asked Questions / Analog Input on: April 25, 2010, 06:03:53 am
Hi I need to get the analog data of 50+ fotodiods and send the data via ethernet to my home computer. Is the Arduino Mega able to read so many fotodiods via analog in?
or do I need to make small boards with some atmel microprocessors and let them communicate with an arduino board?
Or has someone a better Idea to solve my problem?
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