1  # SPDX-FileCopyrightText: 2019 Brent Rubell for Adafruit Industries
  2  #
  3  # SPDX-License-Identifier: MIT
  4  
  5  """
  6  Adafruit IO LoRa Gateway
  7  
  8  Learn Guide: https://learn.adafruit.com/multi-device-lora-temperature-network
  9  
 10  by Brent Rubell for Adafruit Industries
 11  """
 12  # Import Python System Libraries
 13  import time
 14  
 15  # Import Adafruit IO REST client.
 16  from Adafruit_IO import Client
 17  
 18  # Import Blinka Libraries
 19  import busio
 20  import board
 21  from digitalio import DigitalInOut, Direction, Pull
 22  
 23  # Import SSD1306 module.
 24  import adafruit_ssd1306
 25  
 26  # Import RFM9x module
 27  import adafruit_rfm9x
 28  
 29  # Define radio frequency, must match device.
 30  RADIO_FREQ_MHZ = 905.5
 31  
 32  # Button A
 33  btnA = DigitalInOut(board.D5)
 34  btnA.direction = Direction.INPUT
 35  btnA.pull = Pull.UP
 36  
 37  # Button B
 38  btnB = DigitalInOut(board.D6)
 39  btnB.direction = Direction.INPUT
 40  btnB.pull = Pull.UP
 41  
 42  # Button C
 43  btnC = DigitalInOut(board.D12)
 44  btnC.direction = Direction.INPUT
 45  btnC.pull = Pull.UP
 46  
 47  # Create the I2C interface.
 48  i2c = busio.I2C(board.SCL, board.SDA)
 49  
 50  # 128x32 OLED Display
 51  display = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, addr=0x3c)
 52  # Clear the display.
 53  display.fill(0)
 54  display.show()
 55  width = display.width
 56  height = display.height
 57  
 58  # Configure LoRa Radio
 59  CS = DigitalInOut(board.CE1)
 60  RESET = DigitalInOut(board.D25)
 61  spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
 62  rfm9x = adafruit_rfm9x.RFM9x(spi, CS, RESET, RADIO_FREQ_MHZ)
 63  prev_packet = None
 64  
 65  # Set to your Adafruit IO username.
 66  # (go to https://accounts.adafruit.com to find your username)
 67  ADAFRUIT_IO_USERNAME = 'USER'
 68  
 69  # Set to your Adafruit IO key.
 70  ADAFRUIT_IO_KEY = 'KEY'
 71  
 72  # Create an instance of the REST client.
 73  aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
 74  
 75  # Set up Adafruit IO feeds
 76  temperature_feed_1 = aio.feeds('feather-1-temp')
 77  humidity_feed_1 = aio.feeds('feather-1-humid')
 78  pressure_feed_1 = aio.feeds('feather-1-pressure')
 79  
 80  temperature_feed_2 = aio.feeds('feather-2-temp')
 81  humidity_feed_2 = aio.feeds('feather-2-humid')
 82  pressure_feed_2 = aio.feeds('feather-2-pressure')
 83  
 84  def pkt_int_to_float(pkt_val_1, pkt_val_2, pkt_val_3=None):
 85      """Convert packet data to float.
 86      """
 87      if pkt_val_3 is None:
 88          float_val = pkt_val_1 << 8 | pkt_val_2
 89      else:
 90          float_val = pkt_val_1 << 16 | pkt_val_2 << 8 | pkt_val_3
 91      return float_val/100
 92  
 93  while True:
 94      packet = None
 95      # draw a box to clear the image
 96      display.fill(0)
 97      display.text('Adafruit.IO LoRa GTWY', 0, 0, 1)
 98  
 99      # check for packet rx
100      packet = rfm9x.receive()
101      if packet is None or prev_packet:
102          display.show()
103          display.text('- Waiting for PKT -', 10, 20, 1)
104      else:
105          prev_packet = packet
106          print('> New Packet!')
107          # Decode packet
108          temp_val = pkt_int_to_float(packet[1], packet[2])
109          humid_val = pkt_int_to_float(packet[3], packet[4])
110          pres_val = pkt_int_to_float(packet[5], packet[6], packet[7])
111  
112          # Display packet information
113          print('Device ID: LoRa Feather #', packet[0])
114          print("Temp: %0.2f C" % temp_val)
115          print("Humid: %0.2f %% " % humid_val)
116          print("Pressure: %0.2f hPa" % pres_val)
117  
118          # Send to Feather 1 feeds
119          if packet[0] == 0x01:
120              display.fill(0)
121              display.text('Feather #1 Data RX''d!', 15, 0, 1)
122              display.text('Sending to IO...', 0, 20, 1)
123              display.show()
124              aio.send(temperature_feed_1.key, temp_val)
125              aio.send(humidity_feed_1.key, humid_val)
126              aio.send(pressure_feed_1.key, pres_val)
127              display.text('Sent!', 100, 20, 1)
128              display.show()
129          # Send to Feather 2 feeds
130          if packet[0] == 0x02:
131              display.fill(0)
132              display.text('Feather #2 Data RX''d!', 15, 0, 1)
133              display.text('Sending to IO...', 0, 20, 1)
134              display.show()
135              aio.send(temperature_feed_2.key, temp_val)
136              aio.send(humidity_feed_2.key, humid_val)
137              aio.send(pressure_feed_2.key, pres_val)
138              display.text('Sent!', 100, 20, 1)
139              display.show()
140          time.sleep(1)
141  
142      display.show()