====== Temperatur Senor DS18B20 ======
DS18B20
see [[http://www.pihome.eu/2017/10/11/ds18b20-temperature-sensor-with-raspberry-pi/]]
see [[http://www.pihome.eu/2018/02/15/ds18b20-temperature-sensor-to-mysql-mariadb-database/]]
===== Prepare Pi =====
<code>
sudo apt-get install git-core

git clone git://git.drogon.net/wiringPi



cd wiringPi

git pull origin

./build
</code>
==== Test WiringPi ====
<code>
gpio -v

gpio readall
</code>

===== Init =====

load driver
<code>
sudo vi /boot/config.txt

#add line

dtoverlay=w1-gpio
</code>
 
After Login 
<code>
sudo modprobe w1-gpio 

sudo modprobe w1_therm
</code>
==== Read sensor ====
<code>
ls -l /sys/bus/w1/devices/
</code>
===== Sensoren ======
==== DS18B20 ====
=== Wasserdicht ===
Anschlüsse: <code>Schwarz = GND, Rot = VCC, Gelb = Data </code>
[[http://192.168.1.21/dokuwiki/lib/exe/fetch.php?media=ds18b20_wasserfest_beschreibung_und_anschluesse.pdf]]
{{:ds20b18_anschluss.png?nolink&500|}}

{{::ds18b20_pins.jpg?nolink&300|}}

Beschreibung siehe DS18B20 Wasserdicht und Beschreibung

==== Viele verschiedene Sensoren ====
Gute Überblick [[http://www.mikrocontroller.net/articles/Feuchtesensor]]

Adafruit-Raspberry-Pi-Python-Code [[https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code]]
==== SHT3x SHTC1 ====
[[https://www.14core.com/wiring-sensiron-shtxx-temperature-sensor-w-d-python/]]
==== DHT22 ====
[[http://www.raspberrypi.org/forums/viewtopic.php?f=37&t=71336]]
==== DHT11 ====
{{:dht11_details.pdf|}}
[[http://www.geeetech.com/wiki/index.php/Electric_thermometer_by_using_DHT11_sensor_module]]

Kalibrierung

| Sensor# | Feutigkeit |Temperatur | Id |
|1 |34 | 28| |
|2 |34 | 24| |
|3 |35 | 24| |
|4 |34 | 24| |
|5 |34 | 25| |
|6 |35 | 26| |
|7 |fehlerhaft| ablöten|





<code>
# /etc/modules
w1-gpio pullup=1
w1-therm
</code>

<code>
# /boot/config.txt
device_tree=
#dtoverlay=w1-gpio
</code>


==== python code for dht11 sensor====
see [[http://www.raspberrypi.org/forums/viewtopic.php?t=69427&p=505235]]

===== use Adafruit DHT =====
Install
<code>
wget http://goo.gl/oadpl -O Adafruit_DHT
sudo cp Adafruit_DHT /usr/bin/
</code>
Run
<code>
General call sudo Adafruit_DHT {11|12} {gpio}
sudo Adafruit_DHT 11 4
</code>
expected output like
<code>
Using pin #17Data (40): 0x28 0x0 0x18 0x0 0x40
Temp = 24 *C, Hum = 40 %
</code>


===== use own code ======
<code>
    import RPi.GPIO as GPIO
    import time

    def bin2dec(string_num):
        return str(int(string_num, 2))

    data = []

    GPIO.setmode(GPIO.BCM)

    GPIO.setup(4,GPIO.OUT)
    GPIO.output(4,GPIO.HIGH)
    time.sleep(0.025)
    GPIO.output(4,GPIO.LOW)
    time.sleep(0.02)

    GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP)

    for i in range(0,500):
        data.append(GPIO.input(4))

    bit_count = 0
    tmp = 0
    count = 0
    HumidityBit = ""
    TemperatureBit = ""
    crc = ""

    try:
       while data[count] == 1:
          tmp = 1
          count = count + 1

       for i in range(0, 32):
          bit_count = 0

          while data[count] == 0:
             tmp = 1
             count = count + 1

          while data[count] == 1:
             bit_count = bit_count + 1
             count = count + 1

          if bit_count > 3:
             if i>=0 and i<8:
                HumidityBit = HumidityBit + "1"
             if i>=16 and i<24:
                TemperatureBit = TemperatureBit + "1"
          else:
             if i>=0 and i<8:
                HumidityBit = HumidityBit + "0"
             if i>=16 and i<24:
                TemperatureBit = TemperatureBit + "0"

    except:
       print "ERR_RANGE"
       exit(0)

    try:
       for i in range(0, 8):
          bit_count = 0

          while data[count] == 0:
             tmp = 1
             count = count + 1

          while data[count] == 1:
             bit_count = bit_count + 1
             count = count + 1

          if bit_count > 3:
             crc = crc + "1"
          else:
             crc = crc + "0"
    except:
       print "ERR_RANGE"
       exit(0)

    Humidity = bin2dec(HumidityBit)
    Temperature = bin2dec(TemperatureBit)

    if int(Humidity) + int(Temperature) - int(bin2dec(crc)) == 0:
       print Humidity
       print Temperature
    else:
       print "ERR_CRC"
</code>