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Newbie in Arduino and MQTT project-Need help

Former Member

Hi,

I am a newbie in Arduino and MQTT projects..I want to use Temperature sensor as MQTT client by connecting it with Arduino UNO and Ethernet Shield.

I want to buy the required components.Kindly let me know whether the below are the correct components for this...

 

Arduino UNO-Are the both same product?If no,which one is the best to buy?

1)https://www.sparkfun.com/products/11021

2)http://www.simplelabs.co.in/content/arduino-uno

 

Ethernet shield-Are the both same product?If no,which one is the best to buy?

1) http://www.ebay.in/itm/Ethernet-Shield-W5100-for-arduino-UNO-Mega-/141511630995?_trksid=p2054897.l4275

2)https://www.sparkfun.com/products/9026?

 

Hope I have to  buy RJ45 cable?

One more wire seems to be connected from the Arduino board with computer USB port as per the video "https://www.youtube.com/watch?v=xj6eA8BIvlQ".Not sure what is the use of it..Kindly explain me..

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  • After my long trial,finally my first Arduino project has worked for me image

    The steps I did to solve the issue are,

      1)This issue is definitely related to Windows 8 OS which cannot accept unsigned version of drivers.And Arduino UNO driver 1.6 version also is one such driver.Hence first I fixed the issue by following "https://www.youtube.com/watch?v=CdE72XUYC7k" .

    2)Now my Arduino is connected to COM1 port(I selected COM1 as port)

    3)Arduino IDE automatically got the PORT option enabled once the above 2 steps are successful

    4)Now,followed " Intro to Arduino : Run a sketch ",to upload Blink sketch.I gave delay as 5000seconds

    5)While uploading,I got "avrdude: ser_open(): can't open device "\\.\COM1": Access is denied. :" error

    6)But strangely,second time I tried once again.And it started uploading without any issues.And my Arduino is blinking perfectly with a delay of 5000seconds

     

    Thanks a lot for all who have helped me for my first project in Arduino...image

  • in reply to Former Member

    Radhamani,

                             Well done for persevering with the problem.  You can plug / unplug your Arduino's freely.  If you buy more or different model Arduino's you should find that each one will be allocated its own com port provided it has an on board USB to TTL chip.  Also if you buy an external programmer for things like the Pro Mini that do not have a USB connector, then the USB to TTL converter on the programmer will also be given a com port.  Have fun and enjoy your Arduino's.  Take things a step at a time and get each part working before moving onto the next part.  Save each working sketch with a different name then you have something to go back to if your next step fails. ..........image

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  • in reply to Former Member

    Radhamani,

                             Well done for persevering with the problem.  You can plug / unplug your Arduino's freely.  If you buy more or different model Arduino's you should find that each one will be allocated its own com port provided it has an on board USB to TTL chip.  Also if you buy an external programmer for things like the Pro Mini that do not have a USB connector, then the USB to TTL converter on the programmer will also be given a com port.  Have fun and enjoy your Arduino's.  Take things a step at a time and get each part working before moving onto the next part.  Save each working sketch with a different name then you have something to go back to if your next step fails. ..........image

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