1_wire_temperature.py

#!/usr/bin/env python3

import os
import time

device_id = None
temperature = None
i = 0
delay = 3

def get_device_id():
    print("Fetching device ID...")
    try:
        devices = os.listdir("/sys/bus/w1/devices")
        found_device = [dev for dev in devices if '-' in dev]
        if found_device:
            return found_device[0]
        else:
            return None
    except FileNotFoundError:
        return None

def get_temperature(device):
    device_path = f"/sys/bus/w1/devices/{device}/w1_slave"
    print(f"Device Path is {device_path}")
    with open(device_path, 'r') as f:
        lines = f.readlines()
    # The temperature reading is on the second line after 't='
    temp_str = lines[-1].split("t=")[-1].strip()
    temp_c = float(temp_str) / 1000
    return temp_c

def main():
    global device_id, temperature, i

    # Attempt to get a device ID at the start
    if device_id is None:
        device_id = get_device_id()
        if device_id is None:
            print("No 1-Wire sensor found.")
            return

    while True:
        i += 1

        # Fetch temperature from the sensor
        temperature = get_temperature(device_id)

        # If we're within the initial delay period, we could optionally
        # show a "splash" equivalent here. For now, we'll just note it:
        if i < delay:
            print("Showing splash screen...")

        # Once we've passed the delay, print the current temperature
        if i >= delay:
            print(f"{temperature:.2f}º Celsius - {time.strftime('%c')}")

        # Sleep for a second to avoid excessive reads
        time.sleep(1)

if __name__ == "__main__":
    main()