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Question on wireless technologies

vish

Hi element14,

 

As a part of my hobby project, I want to implement some wireless communication between my modules. When I went scouting for the parts, I became confused.

I previously know about WiFi, Bluetooth and ZigBee. But now I'm started seeing some thing called 2.4GHz modules, but can't figure out what exactly this means.

Also I saw nRF24xxx in some posts. How is this different?

What would you suggest if I want to have a data rate of minimum  200KBPS in say some 12m radius with some 4-6 walls in between? I will have some 8-12 nodes in my network that needs to be connected.

 

Thanks ahead,

vish

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  • Hello Vishnu,

    Are you using Arduinos by any chance?

     

    For wireless transceivers, my favorite is the RFM69HW, followed by the nRF24L01...as long as you have the freedom to define your protocol.  If you simply want to have two Arduinos talking wirelessly to each other, these are the best and cheapest, with the most flexibility.  I recommend taking a look at the RFM69HW.  It's not as well known as the nRF24L01, but it's got much better range (over 700 feet through walls).  Both are capable of encryption and sleep, so they work well for battery powered Arduinos.

     

    The RFM69HW is $4 each, the nRF24L01+ (high power version) is about $6.  The only disadvantage to the RFM69HW is that it's not 5V tolerant, but I've pretty much transitioned all my Arduinos to 3.3V.  Edit:  also wanted to add that RFM69HW is 915MHz, and nRF24L01+ is 2.4GHz.

     

    I use them extensively in my budding home automation project.  I don't like zigbee or bluetooth because they're expensive...if you want lots of nodes, the cost adds up.  Plus they don't have as good a range.

     

    Inexpensive & Flexible Home Automation / Wireless Sensors

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  • Hello Vishnu,

    Are you using Arduinos by any chance?

     

    For wireless transceivers, my favorite is the RFM69HW, followed by the nRF24L01...as long as you have the freedom to define your protocol.  If you simply want to have two Arduinos talking wirelessly to each other, these are the best and cheapest, with the most flexibility.  I recommend taking a look at the RFM69HW.  It's not as well known as the nRF24L01, but it's got much better range (over 700 feet through walls).  Both are capable of encryption and sleep, so they work well for battery powered Arduinos.

     

    The RFM69HW is $4 each, the nRF24L01+ (high power version) is about $6.  The only disadvantage to the RFM69HW is that it's not 5V tolerant, but I've pretty much transitioned all my Arduinos to 3.3V.  Edit:  also wanted to add that RFM69HW is 915MHz, and nRF24L01+ is 2.4GHz.

     

    I use them extensively in my budding home automation project.  I don't like zigbee or bluetooth because they're expensive...if you want lots of nodes, the cost adds up.  Plus they don't have as good a range.

     

    Inexpensive & Flexible Home Automation / Wireless Sensors

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