pyRadioHeadRF95

pyRadioHeadRF95

pyRadioHeadRF95 is a Python wrapper for the use of RH_RF95 class of the RadioHead library on a Raspberry Pi.

The library is developed and tested using a Dragino LoRa shield.

Requirements:

• bcm2835 (http://www.airspayce.com/mikem/bcm2835)
• cffi (http://cffi.readthedocs.io/en/latest/index.html)

Compiling:

Move to the main directory and run:

make

Wirings (Dragino LoRa shield):

Writing programs using pyRadioHeadRF95

• Import the module: import pyRadioHeadRF95 as Radio

• If the program is in a different directory, the path to pyRadioHeadRF95 need to be added to PYTHONPATH

Using directly the Driver with no Manager

• Instantiate an object of the RF95 class: rf95 = Radio.RF95()
• Call the initalizer: rf95.init()
• Set the frequency: rf95.setFrequency(<FREQ>)
• Set radio transmission power: rf95.setTxPower(<dBm>, <useRFO>)

Configuring Bandwidth

Done via the method rf95.setSignalBandwidth(<BW>)

Possible values are listed in pyRadioHeadRF95.py

Configuring Spreading Factor

Done via the method rf95.setSpreadingFactor(<SF>)

Possible values are listed in pyRadioHeadRF95.py

Configuring Coding Rate

Done via the method rf95.setCodingRate4(<CR_DEN>)

Possible values are listed in pyRadioHeadRF95.py

Sending and Receiving

rf95.send(msg, len(msg))  
rf95.waitPacketSent()  


if rf95.available():  
    (msg, l) = rf95.recv()    

Using the ReliableDatagram Manager

• Instantiate an object of the RF95 class: rf95 = Radio.RF95() and initialize it as explained above
• Call the initalizer: rf95.managerInit(<MY_ADDRESS>), where the address is an integer

Sending and Receiving

rf95.sendtoWait(msg, len(msg), destination)  


if rf95.available():  
     (msg, l, source) = rf95.recvfromAck()

Running Examples:

Once the package is compiled run:

sudo ./examples/rf_server.py

or

sudo ./examples/rf_reliable_server.py