About the RFBee

The HR80 radiator controllers and the CM67z controller units communicate via RF in the 868 MHz frequency band.

In Europe, 863 to 870  MHz band has been allocated for license-free operation using FHSS, DSSS, or analog modulation with either a transmission duty cycle of 0.1%, 1% or 10% depending on the band, or Listen Before Talk (LBT) with Adaptive Frequency Agility (AFA). To listen to this communication, a RF module called “RFBee” can be used. It provides easy and flexible wireless data transmission between devices and is based on a AVR Atmega168 (8 MHz internal clock frequency) working as a fully functional Arduino connected via SPI to a TI CC1101 RF transceiver.

rfbee

 

 

 

 

 

Pros:

  • Default firmware can be used to easily implement a point-to-point or point-to-multipoint network.
  • If you are free to decide how the frames sent over the air look like (e.g. length indicator or CRCs) then you can use CC1101’s built-in package handling functions.

Cons:

  • If you want to receive RF frames that are not supported by the CC1101’s built-in package handling functions, then you have to write your own customized firmware using Arduino, and you have to dive into the CC1101 specification. However, you can use large parts of the “original” firmware, which is available as source code.
  • With a Atmel ATmega 168 clocked with only 8 MHz, you don’t have too much computing power to do complex coding/decoding of frames received over the air.
Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s