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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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  • Radhamani,  The products you are comparing are essentially the same.  The Arduino UNO comes as the genuine item, which tend to be quite expensive, and then there are many clones.  The latest version is the UNO R3.  The cheapest clones generally come from China and the far east.  Some of the UNO clones use the CH340 USB interface, this is not the standard interface chip and may cause problems on some systems although I use these clones on my Windows 7 64 bit machine with no problems.

     

    It is a similar story for the Ethernet board, the genuine items is expensive, and there are clones which are much cheaper.  In my experience the clones work perfectly well.  The ethernet shield plugs straight onto the UNO and so there are no wires to connect between the two.  The Ethernet shield then has sockets to connect external sensors etc.

     

    There are no video cables associated with the UNO.  You need a cable to connect from your PC USB port to the UNO USB port.  The PC end of the cable is fairly standard and the official UNO uses a USB type B connector but some of the clones use the smaller USB connectors. A lot of clone boards include a cable so that is a good way to get started.

     

    The Ethernet shield needs an Ethernet cable to link the shield to your PC or router Ethernet port.

     

    There are some very good examples of using the Ethernet shield within the Arduino Ethernet library, I suggest you try these to gain experience. 

     

    For MQTT I suggest you install 'Mosquitto' as a broker on your PC and then use MQTT-Spy to to send / view packets.  There is a lot of information on both these items on the net.

     

    Hope that helps

     

    Bob

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  • Radhamani,  The products you are comparing are essentially the same.  The Arduino UNO comes as the genuine item, which tend to be quite expensive, and then there are many clones.  The latest version is the UNO R3.  The cheapest clones generally come from China and the far east.  Some of the UNO clones use the CH340 USB interface, this is not the standard interface chip and may cause problems on some systems although I use these clones on my Windows 7 64 bit machine with no problems.

     

    It is a similar story for the Ethernet board, the genuine items is expensive, and there are clones which are much cheaper.  In my experience the clones work perfectly well.  The ethernet shield plugs straight onto the UNO and so there are no wires to connect between the two.  The Ethernet shield then has sockets to connect external sensors etc.

     

    There are no video cables associated with the UNO.  You need a cable to connect from your PC USB port to the UNO USB port.  The PC end of the cable is fairly standard and the official UNO uses a USB type B connector but some of the clones use the smaller USB connectors. A lot of clone boards include a cable so that is a good way to get started.

     

    The Ethernet shield needs an Ethernet cable to link the shield to your PC or router Ethernet port.

     

    There are some very good examples of using the Ethernet shield within the Arduino Ethernet library, I suggest you try these to gain experience. 

     

    For MQTT I suggest you install 'Mosquitto' as a broker on your PC and then use MQTT-Spy to to send / view packets.  There is a lot of information on both these items on the net.

     

    Hope that helps

     

    Bob

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