pappus/tx_temp_data.py at main · conservationtechlab/pappus · GitHub

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"""
Purpose: Send "ack" LoRa messages with temperature data
Organization: San Diego Wildlife Association: Conservation Technology Lab (CTL)
Author: Trent Moca
Date: 11/10/22

Collect temperature data using gpiozero CPU temperature, then acknowledge send over LoRa.
Additionally, display internet data and LoRa status on the builtin OLED. If the packet was
unable to reach the indended destination (ie: ack was not received), indicate on the display.
This code may be used on the transmitting node in a 2-node test with the receiver running the
"rx_csv_make.py" code.

SOURCE
Learn Guide: https://learn.adafruit.com/lora-and-lorawan-for-raspberry-pi
Author: Brent Rubell for Adafruit Industries
"""


# Import Python System Libraries
import time
import subprocess

# Import Blinka Libraries
import busio
from digitalio import DigitalInOut, Direction, Pull
import board
# Import the SSD1306 module.
import adafruit_ssd1306
# Import RFM9x
import adafruit_rfm9x  # https://github.com/adafruit/Adafruit_CircuitPython_RFM9x/blob/main/adafruit_rfm9x.py
# For accessing CPU temperature data
from gpiozero import CPUTemperature


btnA = DigitalInOut(board.D5)
btnA.direction = Direction.INPUT
btnA.pull = Pull.UP


def configDisplay():
    # Create the I2C interface.
    i2c = busio.I2C(board.SCL, board.SDA)

    # 128x32 OLED Display
    reset_pin = DigitalInOut(board.D4)
    display = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, reset=reset_pin)
    # Clear the display.
    display.fill(0)
    display.show()
    return display


def getTemperature():
    cpu = CPUTemperature()
    return cpu.temperature  # float, in degrees celsius


def configRadio():
    CS = DigitalInOut(board.CE1)
    RESET = DigitalInOut(board.D25)
    spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
    rfm9x = adafruit_rfm9x.RFM9x(spi, CS, RESET, 915.0)
    rfm9x.tx_power = 23
    rfm9x.ack_delay = 0.1
    rfm9x.node = ord('t')  # t as in tx -> inconsequential
    rfm9x.destination = ord('r')  # r as in rx -> rx_csv_make.py
    return rfm9x


def sendTemp(rfm9x):
    curr_time = int(time.time())
    temp_str = str(curr_time) + ": " + str(getTemperature())
    temp_data = bytes(temp_str, "utf-8")
    return rfm9x.send_with_ack(temp_data)


# returns hostname, first ip, and second ip
def getHostData():  # derived from scrubcam "little_readout.py"
    cmd = "hostname"
    hostname = subprocess.check_output(cmd, shell=True).decode("utf-8")
    cmd = "hostname -I | cut -d' ' -f1"
    ip1 = subprocess.check_output(cmd, shell=True).decode("utf-8")
    cmd = "hostname -I | cut -d' ' -f2"
    ip2 = subprocess.check_output(cmd, shell=True).decode("utf-8")
    return hostname, ip1, ip2


def getIP1():
    host, i1, i2 = getHostData()
    return i1


if __name__ == '__main__':
    rfm9x = configRadio()
    display = configDisplay()

    spacing = int(display.height/4)

    hostname, ip1, ip2 = getHostData()
    host_text = "Host: " + hostname
    ip1_text = "IP1: " + ip1
    ip2_text = "IP2: " + ip2

    # Send LoRa, but mostly fill and refresh the display
    while True:
        if not btnA.value:
            display.fill(0)
            display.text(ip1_text, 0, spacing, 1)
            display.show()
            break
        time.sleep(3)
        got_ack = sendTemp(rfm9x)
        display.fill(0)
        display.show()
        display.text(host_text, 0, 0, 1)
        if len(ip1) < 2:
            ip1_text = 'IP1: ' + getIP1()  # update ip if none at start
        display.text(ip1_text, 0, spacing, 1)
        # Update LoRa status
        if (got_ack):
            display.text('Sent Successfully', 0, 3*spacing, 1)
        else:
            display.text('Unable to reach destination', 0, 3*spacing, 1)
        display.show()