50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import os
|
|
import glob
|
|
import time
|
|
import subprocess
|
|
|
|
# Base directory for the 1-Wire devices
|
|
base_dir = '/sys/bus/w1/devices/'
|
|
# Device folder for your specific sensor
|
|
device_folder = glob.glob(base_dir + '28-1f38831e64ff')[0]
|
|
# Path to the w1_slave file
|
|
device_file = device_folder + '/w1_slave'
|
|
|
|
def read_temp_raw():
|
|
"""Read the raw temperature data from the sensor."""
|
|
with open(device_file, 'r') as f:
|
|
lines = f.readlines()
|
|
return lines
|
|
|
|
def read_temp():
|
|
"""Parse the raw temperature data and return the temperature in Celsius."""
|
|
lines = read_temp_raw()
|
|
# Wait until the sensor output is valid
|
|
while lines[0].strip()[-3:] != 'YES':
|
|
time.sleep(0.2)
|
|
lines = read_temp_raw()
|
|
# Find the temperature value in the second line
|
|
equals_pos = lines[1].find('t=')
|
|
if equals_pos != -1:
|
|
temp_string = lines[1][equals_pos + 2:]
|
|
temp_c = float(temp_string) / 1000.0
|
|
return temp_c
|
|
|
|
def execute_command(command):
|
|
"""Execute a shell command."""
|
|
subprocess.run(command, shell=True)
|
|
|
|
# Main loop to read and print the temperature
|
|
if __name__ == "__main__":
|
|
execute_command('pinctrl set 18 op') # First, set it as output
|
|
while True:
|
|
temp_c = read_temp()
|
|
print(f"Temperature: {temp_c:.2f} °C")
|
|
|
|
if temp_c >= 46:
|
|
execute_command('pinctrl set 18 dl')
|
|
elif temp_c <= 40:
|
|
execute_command('pinctrl set 18 dh')
|
|
|
|
time.sleep(1)
|