Raspberry Pi DS18B20 Temperature Sensor Tutorial
sudo nano /boot/config.txt (tiedoston loppuun: [all] dtoverlay=w1-gpio)
sudo modprobe w1-gpio
sudo modprobe w1-therm
cd /sys/bus/w1/devices
/sys/bus/w1/devices $ ls
28-5c67c70664ff w1_bus_master1
cd 28-5c67c70664ff
$ cat w1_slave
4d 01 55 00 7f ff 0c 10 fd : crc=fd YES
4d 01 55 00 7f ff 0c 10 fd t=20812
koodaa seuraava koodi /home/pi/temperature - kansioon
cd /home/pi
mkdir omanimi
cd omanimi
nano temperature.py
temperature.py
import os
import glob
import time
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
def read_temp_raw():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines
def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
temp_f = temp_c * 9.0 / 5.0 + 32.0
return temp_c, temp_f
while True:
print(read_temp())
time.sleep(1)
Testaus:
python temperaure.py
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.25, 72.05)
(22.187, 71.9366)
(22.25, 72.05)