Hardware
========

Right now, the development reference hardware is an Adafruit M0 with
RFM95 and the Adalogger wing; with the PyCom LoPy4 and Pytrack as another
option. For gateways, I have a Raspberry Pi model 3 B+ with the Dragino
LoRa/GPS hat, and I’m looking at the Sparkfun LoRaWAN gateway. There’s
a strong possibility that the LoRaWAN protocol won’t be used, and an
alternate protocol will be developed, possibly based on MQTT.

.. image:: /_static/proto_hardware.jpg

I envision the bare minimum hardware requirements for a node as:

+ LoRa capable radio
+ SD for mass storage
+ 24LC-series I2C EEPROM (possible 25LC-series SPI EEPROM) for storing
  node identity
+ RTC (e.g. DS1307)
+ a capable CPU - e.g. Cortex M0 or ESP32

Firmware development is currently primarily targeted at the Feather-based
development hardware - see the `firmware/` directory in the repo for the
current firmware.

Links
-----

+ `Adafruit M0 with RFM95 <https://www.adafruit.com/product/3178>`_
  (also see the `pinouts <https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module/pinouts>`_)
+ `Adalogger featherwing <https://www.adafruit.com/product/2922>`_ 
  with PCF8523 RTC
+ `PyCom LoPy4 (SX1276) <https://www.sparkfun.com/products/14674>`_
+ `Pytrack <https://www.sparkfun.com/products/15159>`_