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