documentation update

README.md

@@ -1,2 +1,37 @@
 # pimatic-bh1750
 Pimatic support for the bh1750 light intensity sensor
+
+### Drivers
+
+I2C drivers need to be loaded in order to create the connection between the physical sensor and the rPI.
+You can load them from the terminal (or from the /etc/modules script).
+
+    sudo modprobe i2c_dev
+    sudo modprobe i2c_bcm2708
+
+You might also need to uncomment the following line in /boot/config.txt
+
+	dtparam=i2c_arm=on
+
+### Example config
+
+Add the plugin to the plugin section:
+
+```json
+{ 
+  "plugin": "bh1750"
+}
+```
+
+Then add a sensor for your device to the devices section:
+
+```json
+{
+  "id": "my-sensor",
+  "name": "bh1750 example",
+  "class": "BH1750Sensor",
+  "device": "/dev/i2c-0",
+  "address": "0x23",
+  "interval": 10000
+}
+```