adding files for tinylora circuitpython guide

TheThingsNetwork_Feather/code.py

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+"""TinyLoRa with a Si7021 Sensor.
+"""
+import time
+import busio
+import digitalio
+import board
+import adafruit_si7021
+from adafruit_tinylora.adafruit_tinylora import TTN, TinyLoRa
+
+# Board LED
+led = digitalio.DigitalInOut(board.D13)
+led.direction = digitalio.Direction.OUTPUT
+
+# Create library object using our bus i2c port for si7021
+i2c = busio.I2C(board.SCL, board.SDA)
+sensor = adafruit_si7021.SI7021(i2c)
+
+# Create library object using our bus SPI port for radio
+spi = busio.SPI(board.SCK, MISO=board.MISO, MOSI=board.MOSI)
+
+# RFM9x Breakout Pinouts
+cs = digitalio.DigitalInOut(board.D5)
+irq = digitalio.DigitalInOut(board.D6)
+
+# Feather M0 RFM9x Pinouts
+# irq = digitalio.DigitalInOut(board.RFM9X_D0)
+# cs = digitalio.DigitalInOut(board.RFM9X_CS)
+
+# TTN Device Address, 4 Bytes, MSB
+devaddr = bytearray([0x00, 0x00, 0x00, 0x00])
+
+# TTN Network Key, 16 Bytes, MSB
+nwkey = bytearray([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
+
+# TTN Application Key, 16 Bytess, MSB
+app = bytearray([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
+
+ttn_config = TTN(devaddr, nwkey, app, country='US')
+
+lora = TinyLoRa(spi, cs, irq, ttn_config)
+
+# Data Packet to send to TTN
+data = bytearray(4)
+
+while True:
+    temp_val = sensor.temperature
+    humid_val = sensor.relative_humidity
+    print('Temperature: %0.2f C' % temp_val)
+    print('relative humidity: %0.1f %%' % humid_val)
+
+    # Encode float as int
+    temp_val = int(temp_val * 100)
+    humid_val = int(humid_val * 100)
+
+    # Encode payload as bytes
+    data[0] = (temp_val >> 8) & 0xff
+    data[1] = temp_val & 0xff
+    data[2] = (humid_val >> 8) & 0xff
+    data[3] = humid_val & 0xff
+
+    # Send data packet
+    print('Sending packet...')
+    lora.send_data(data, len(data), lora.frame_counter)
+    print('Packet Sent!')
+    led.value = True
+    lora.frame_counter += 1
+    time.sleep(2)
+    led.value = False

TheThingsNetwork_Feather/si7021_decoder.js

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+// TinyLoRa - Si7021 Decoder
+function Decoder(bytes, port) {
+  var decoded = {};
+
+  // Decode bytes to int
+  var celciusInt = (bytes[0] << 8) | bytes[1];
+  var humidInt = (bytes[2] << 8) | bytes[3];
+  
+  // Decode int to float
+  decoded.celcius = celciusInt / 100;
+  decoded.humid = humidInt / 100;
+
+  return decoded;
+}