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676  Forum 2005-2010 (read only) / Interfacing / Re: HS1101 Humidity sensor - Get accurate readings... on: January 02, 2010, 11:37:22 am
See this page:

http://www.phanderson.com/picaxe/rh_count.html
677  Forum 2005-2010 (read only) / Interfacing / Re: Arduino Atmega 168 & Arduino Ethernet Shield on: December 04, 2009, 05:34:59 am
Quote
've unpluged the switch and plug ethernet shield directly to the computer and nothing happens.

If you connect the ethernet shield directly with the pc then you need to use a cross over cable.
I suggest to use an ethernet switch or ethernet hub.

It looks like you have a networking problem and not an arduino problem. >smiley-sad
Please try to connect a second computer to your network and then ping this computer. If it doesn't work you have to solve this networking problem first.

Generally it is pretty easy to run the ethernet shield on a working network. For the first test you should always use the sample sketches from the arduino website.
678  Forum 2005-2010 (read only) / Interfacing / Re: Arduino Atmega 168 & Arduino Ethernet Shield on: December 03, 2009, 06:54:34 am
Did you open the serial monitor to see the result which is sent to the serial interface?

Please check on your network if you arduino board is available. Use the command "Ping". And also check with ping if the external server (google) ist reachable.

Quote
byte ip[] = { 89,68,33,125 }; // ip pc
This should be an unique ip address for the arduino and not the ip of you pc. Usually I use an internal, private ip address for the arduino board, i.e 10.0.0.10 or 192.168.1.10

679  Forum 2005-2010 (read only) / Interfacing / Re: DCF-77 Receiver on: November 30, 2009, 03:44:39 am
Use the following tutorial with the Conrad Receiver.

http://www.rudiniemeijer.nl/wordpress/?p=516

680  Forum 2005-2010 (read only) / Interfacing / Re: Getting output from GPS on: November 25, 2009, 02:16:33 am
The easiest way to read and extract the data from a gps modul is when you use a Arduino library, i.e TinyGPS (http://arduiniana.org/libraries/TinyGPS/)
681  Forum 2005-2010 (read only) / Interfacing / Re: Softserial (base on digital pins) + IR on: November 05, 2009, 05:37:31 am
That's a pretty cool project.  smiley

I used 2 RBBB from Modern Device for the transmitter and the receiver.
The transmitter worked immediately. But my receiver coudn't read the data from the IR Receiver. I used a SFH5110.
After I checked the signal at the RX input I saw that the signal wasn't a clean digital signal.

Therefore I used a TTL IC 7400 and used 2 inverters to get a clear signal at the RX port (D0). After this small change I was able to receive the data.

The 2 inverters where connected between IR receiver output and rx port.
682  Forum 2005-2010 (read only) / Interfacing / Re: How to tell if my washer and dryer are on? on: October 12, 2009, 05:37:28 am
Quote
I'd actually go for the inductance method, simple cheap and safe

I would also suggest a solution with a current sensor.
Example: http://www.nuvotem.com/en/products/as.shtml

With this solution you only need to mount the sensor over the power cable. Safe an easy.
683  Forum 2005-2010 (read only) / Interfacing / Re: Controlling AC power on: October 27, 2009, 10:17:10 am
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I don't have much electronics experience

and

Quote
I live in Canada, so it's 110 or 120V AC.

Be careful when you start with this project. Little experience and 120 VAC is dangerous.

As already mentionend there is a lot of information on the arduino website. Use the search function or open Google and search for "Relais".
684  Forum 2005-2010 (read only) / Interfacing / Re: analogRead() and AREF on: October 26, 2009, 06:39:50 am
Quote
The easy, but not so cool solution is to power the display from its own seperate powersupply.

I suggest to implement this solution with independent power supply. If you do not need the USB port for data transfer during normal operation I suggest to disconnect from USB.

Test with an external power supply the current you need to run the arduino and the LCD.
685  Forum 2005-2010 (read only) / Interfacing / Re: Digital pins to communicate with LCD Screens on: October 08, 2009, 05:49:35 am
Quote
but if you have the Serial LCD's, you can still use both! With alot less pins. Same concept, create 2 serial connections on the Pins, then write the same way.
SoftwareSerial mySerial(2, 3);
SoftwareSerial mySerial2(4, 5);

@mathewjenkinson
Serial displays only need 2 pins for the communication with the arduino controller.
As the example shows it is very easy to implement a solution with 2 or more LCD's.
686  Forum 2005-2010 (read only) / Interfacing / Re: Help me understand my LM34 Temp Sensor on: October 08, 2009, 01:11:39 am
The output for the LM34 is simply 10mV/C Fahrenheit

Example:
50 C Fahrenheit = 50 * 10 mV = 500 mV

The minimum power supply voltage is 5 VDC. According the datasheet the sensor has a power supply range from 5 - 30 VDC.

I suggest that you first read the input voltage without a mathematical convertion.
687  Forum 2005-2010 (read only) / Interfacing / Re: I can't get my ethernet shiel to connect on: October 07, 2009, 03:00:28 am
Use the published scriptes from the arduino website to test your ethernet shield.

Use an internal IP addresses, ie. 192.168.x.x and the MAC address which is in the code sample.

see this thread: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1236679841

As a beginner alway start with sample sketches. Don't change code until you know that your little project works. After you can add or change the code.

Hope this helps.
Webmeister
688  Forum 2005-2010 (read only) / Interfacing / Re: Newbie help with arduino sensor data -> processing on: October 07, 2009, 04:05:12 am
@pixielex
See my comment in the second thread regarding the baud rate:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1254863582/1#1
689  Forum 2005-2010 (read only) / Interfacing / Re: Newbie help with arduino sensor data -> processing on: October 07, 2009, 01:34:11 am
You are sending data with 9600 Baud and receiving with 57600
690  Forum 2005-2010 (read only) / Workshops / Re: Any ebook of "Practical Arduino"? on: June 05, 2010, 01:48:06 am
You can buy the mentioned book from the publishers website as a PDF- ebook.

http://apress.com/book/view/1430224770
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