Difference between revisions of "DS18B20"
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[[File:Rpi2-DS18B20.png|600px]] | [[File:Rpi2-DS18B20.png|600px]] | ||
==Code== | ==Code== | ||
| + | ===RPi.GPIO version=== | ||
| + | <source lang="bash"> | ||
| + | root@rpi2:~# python | ||
| + | Python 2.7.3 (default, Jun 22 2016, 03:14:32) | ||
| + | [GCC 4.6.3] on linux2 | ||
| + | Type "help", "copyright", "credits" or "license" for more information. | ||
| + | >>> import RPi.GPIO as GPIO | ||
| + | >>> GPIO.VERSION | ||
| + | '0.6.2' | ||
| + | >>> | ||
| + | </source> | ||
| + | |||
| + | |||
<source lang="text"> | <source lang="text"> | ||
# add this line to /boot/config.txt | # add this line to /boot/config.txt | ||
Revision as of 15:51, 4 May 2017
DS18B20
Contents
DS18B20
Pinout
Resources
1-Wire at wikipedia.
Raspberry Pi
Schematic
Code
RPi.GPIO version
root@rpi2:~# python
Python 2.7.3 (default, Jun 22 2016, 03:14:32)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import RPi.GPIO as GPIO
>>> GPIO.VERSION
'0.6.2'
>>>
# add this line to /boot/config.txt
dtoverlay=w1-gpio
modprobe w1-gpio
modprobe w1-therm
# device directory
cd /sys/bus/w1/devices
ls -l
# cd to your unique DS18B20 identifier
cat w1_slave
#!/usr/bin/env python
import time
import os
os.system("/sbin/modprobe w1-gpio")
os.system("/sbin/modprobe w1-therm")
try:
while True:
tempfile = open("/sys/bus/w1/devices/28-80000028ac7c/w1_slave")
thetext = tempfile.read()
tempfile.close()
tempdata = thetext.split("\n")[1].split(" ")[9]
temperature = float(tempdata[2:])
temperature = 9.0 / 5.0 * (temperature / 1000) + 32
print temperature
time.sleep(1)
except KeyboardInterrupt:
pass
