120 lines
3.3 KiB
Python
Executable file
120 lines
3.3 KiB
Python
Executable file
"""
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Example for using the RFM9x Radio with Raspberry Pi and LoRaWAN
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Learn Guide: https://learn.adafruit.com/lora-and-lorawan-for-raspberry-pi
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Author: Brent Rubell for Adafruit Industries
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"""
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import threading
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import time
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import subprocess
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import busio
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from digitalio import DigitalInOut, Direction, Pull
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import board
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# Import thte SSD1306 module.
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import adafruit_ssd1306
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# Import Adafruit TinyLoRa
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from adafruit_tinylora.adafruit_tinylora import TTN, TinyLoRa
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# Button A
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btnA = DigitalInOut(board.D5)
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btnA.direction = Direction.INPUT
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btnA.pull = Pull.UP
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# Button B
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btnB = DigitalInOut(board.D6)
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btnB.direction = Direction.INPUT
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btnB.pull = Pull.UP
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# Button C
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btnC = DigitalInOut(board.D12)
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btnC.direction = Direction.INPUT
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btnC.pull = Pull.UP
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# Create the I2C interface.
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i2c = busio.I2C(board.SCL, board.SDA)
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# 128x32 OLED Display
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reset_pin = DigitalInOut(board.D4)
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display = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, reset=reset_pin)
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# Clear the display.
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display.fill(0)
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display.show()
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width = display.width
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height = display.height
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# TinyLoRa Configuration
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spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
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cs = DigitalInOut(board.CE1)
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irq = DigitalInOut(board.D22)
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rst = DigitalInOut(board.D25)
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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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# Initialize ThingsNetwork configuration
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ttn_config = TTN(devaddr, nwkey, app, country='US')
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# Initialize lora object
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lora = TinyLoRa(spi, cs, irq, rst, ttn_config)
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# 2b array to store sensor data
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data_pkt = bytearray(2)
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# time to delay periodic packet sends (in seconds)
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data_pkt_delay = 5.0
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def send_pi_data_periodic():
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threading.Timer(data_pkt_delay, send_pi_data_periodic).start()
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print("Sending periodic data...")
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send_pi_data(CPU)
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print('CPU:', CPU)
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def send_pi_data(data):
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# Encode float as int
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data = int(data * 100)
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# Encode payload as bytes
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data_pkt[0] = (data >> 8) & 0xff
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data_pkt[1] = data & 0xff
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# Send data packet
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lora.send_data(data_pkt, len(data_pkt), lora.frame_counter)
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lora.frame_counter += 1
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display.fill(0)
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display.text('Sent Data to TTN!', 15, 15, 1)
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print('Data sent!')
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display.show()
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time.sleep(0.5)
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while True:
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packet = None
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# draw a box to clear the image
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display.fill(0)
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display.text('RasPi LoRaWAN', 35, 0, 1)
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# read the raspberry pi cpu load
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cmd = "top -bn1 | grep load | awk '{printf \"%.1f\", $(NF-2)}'"
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CPU = subprocess.check_output(cmd, shell = True )
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CPU = float(CPU)
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if not btnA.value:
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# Send Packet
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send_pi_data(CPU)
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if not btnB.value:
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# Display CPU Load
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display.fill(0)
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display.text('CPU Load %', 45, 0, 1)
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display.text(str(CPU), 60, 15, 1)
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display.show()
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time.sleep(0.1)
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if not btnC.value:
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display.fill(0)
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display.text('* Periodic Mode *', 15, 0, 1)
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display.show()
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time.sleep(0.5)
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send_pi_data_periodic()
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display.show()
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time.sleep(.1)
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