Difference between revisions of "DS18B20"
(→Code: add .py gpio version code) |
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| Line 8: | Line 8: | ||
==Raspberry Pi== | ==Raspberry Pi== | ||
| − | ==Schematic== | + | ===Schematic=== |
[[File:Rpi2-DS18B20.png|600px]] | [[File:Rpi2-DS18B20.png|600px]] | ||
| − | ==Code== | + | ===Code=== |
| − | ===RPi.GPIO version=== | + | ====RPi.GPIO version==== |
<source lang="bash"> | <source lang="bash"> | ||
root@rpi2:~# python | root@rpi2:~# python | ||
| Line 23: | Line 23: | ||
</source> | </source> | ||
| − | + | ====Setup 1 wire==== | |
| − | <source lang=" | + | <source lang="bash"> |
# add this line to /boot/config.txt | # add this line to /boot/config.txt | ||
dtoverlay=w1-gpio | dtoverlay=w1-gpio | ||
| Line 38: | Line 38: | ||
</source> | </source> | ||
| − | + | ====Read and display==== | |
<source lang="python"> | <source lang="python"> | ||
Revision as of 15:54, 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'
>>>
Setup 1 wire
# 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
Read and display
#!/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
