diff --git a/cleanup.sh b/cleanup.sh
index 6ba42b4..febad43 100755
--- a/cleanup.sh
+++ b/cleanup.sh
@@ -8,8 +8,13 @@
 apt-get -y --purge autoremove i2c-tools lighttpd php5-cgi bc
 
 # I2C-Treiber deaktivieren
-cp /etc/modprobe.d/raspi-blacklist.conf.bak /etc/modprobe.d/raspi-blacklist.conf
 sed '/i2c-dev/d' /etc/modules >/etc/modules.tmp && mv /etc/modules.tmp /etc/modules
+modprobe -r i2c_dev
+# Nicht mehr benötigte Dateien aus älteren Versionen entfernen
+if [ -e /etc/modprobe.d/raspi-blacklist.conf.bak ]
+  then
+    rm /etc/modprobe.d/raspi-blacklist.conf.bak
+fi
 
 # raspi-sht21.sh aus den runleveln und logrotate entfernen
 update-rc.d -f raspi-sht21.sh remove
diff --git a/install.sh b/install.sh
index b7655d1..ab5fc05 100755
--- a/install.sh
+++ b/install.sh
@@ -15,12 +15,39 @@ function check() {
 apt-get update && apt-get -y install i2c-tools lighttpd php5-cgi bc resolvconf
 check $?
 
+# Aktivierung der I2C Schnittstelle des Raspberry Pi
+# Der Code wurde dem raspi-config Tool entnommen.
+CONFIG=/boot/config.txt
+SETTING=on
+DEVICE_TREE="yes" # assume not disabled
+  DEFAULT=
+  if [ -e $CONFIG ] && grep -q "^device_tree=$" $CONFIG; then
+    DEVICE_TREE="no"
+  fi
+
+  CURRENT_SETTING="off" # assume disabled
+  DEFAULT=--defaultno
+  if [ -e $CONFIG ] && grep -q -E "^(device_tree_param|dtparam)=([^,]*,)*i2c(_arm)?(=(on|true|yes|1))?(,.*)?$" $CONFIG; then
+    CURRENT_SETTING="on"
+    DEFAULT=
+  fi
+  if [ $SETTING != $CURRENT_SETTING ]; then
+    echo "Die I2C-Schnittstelle wird beim nächsten Neustart aktiviert."
+  fi
+  sed $CONFIG -i -r -e "s/^((device_tree_param|dtparam)=([^,]*,)*i2c(_arm)?)(=[^,]*)?/\1=$SETTING/"
+  if ! grep -q -E "^(device_tree_param|dtparam)=([^,]*,)*i2c(_arm)?=[^,]*" $CONFIG; then
+    printf "dtparam=i2c_arm=$SETTING\n" >> $CONFIG
+  fi
+  if [ $SETTING = "off" ]; then
+    return 0
+  fi
+
 # I2C-Treiberaktivierung
 echo "I2C-Treiberaktivierung"
 echo "i2c-dev" >>/etc/modules
-check $? 
-cp /etc/modprobe.d/raspi-blacklist.conf /etc/modprobe.d/raspi-blacklist.conf.bak
-cp raspi-blacklist.conf /etc/modprobe.d/
+modprobe i2c-dev
+lsmod | grep i2c_dev
+check $?
 adduser pi i2c
 check $?
 
@@ -60,4 +87,5 @@ check $?
 # lighttpd zum Abschluss neustarten
 service lighttpd restart
 cd
+echo "Bitte starten Sie den Raspberry Pi zum Abschluss der Installation einmal neu!"
 exit 0
diff --git a/raspi-blacklist.conf b/raspi-blacklist.conf
deleted file mode 100644
index d7e3a73..0000000
--- a/raspi-blacklist.conf
+++ /dev/null
@@ -1,4 +0,0 @@
-# blacklist spi and i2c by default (many users don't need them)
-
-blacklist spi-bcm2708
-#blacklist i2c-bcm2708