Changes between Version 26 and Version 27 of Letibee

Timestamp:

Nov 5, 2010, 1:06:48 PM (14 years ago)

Author:

Sensei

Comment:

--

Letibee

@@ -9 +9 @@
 == Objectives ==
 
-The network at CEA-Leti provides information to an end-user located at a gateway or through the Sensei platform (Cf. Figure 1). 
+The network at CEA-Leti provides information to an end-user located at a gateway or through the Sensei platform as shown in the figure below. 
 
 These information are:
@@ -18 +18 @@
 [[Image(cea_wsan.png, 40%,center)]]
 
-                                                               Figure 1 : CEA WSAN + Gateway for Sensei  
 
 == Letibee WSAN ==
@@ -24 +23 @@
 The WSAN does not use standardized communication protocols. Due to this constraint the communication with a node is not direct but through a virtual connection managed by a gateway (ie : a more powerful node included in the network).
 
+
+
 [[Image(network.png, 60%, center)]]
+
+
 
 LETIBEE network comprises nodes spatially distributed in a 2D area, including anchors with known locations and blind nodes to be positioned. 
@@ -41 +44 @@
 It has been decided to port the RIME stack for Contiki v2.4 from SICS onto the LETIBEE node (CEA-Leti based on the Letibee chip, both of them using a 8051 uC). 
 The RIME stack includes the functions for mesh networking including '''neighbour discovery''' (and neighbour table construction), '''route discovery''' (and routing tables construction) and '''multi-hop forwarding''' using the discovered routes. 
-A view of the stack is shown on Figure 2.
+A view of the stack is shown in the figure below.
 
 [[Image(rime.png, 70%, center)]]
-
-                                                 Figure 2 : RIME network stack
 
 Modules, used in the application, are described below:
@@ -76 +77 @@
 [[Image(frame_format.png, 60%, center)]]
 
-                                       Figure 3 : Frame format over the air on the different protocol layers
-
 ==== Gateway frame format ====
 
@@ -83 +82 @@
 
 [[Image(frame_usb.png, 50%, center)]]
-
-                                              Figure 4 : Frame format over the USB port.
 
 * To sink from gateway, the source address is added at its beginning of the APDU. 
@@ -201 +198 @@
 == Datamanager ==
 
-[[Image(datamanager.png, 60%, center)]]
-
-The datamanager is a standalone software which have the following objectives:
+The datamanager is a standalone server which have the following roles:
 
 * Gather frames received on the usb port from the Letibee WSN
@@ -209 +204 @@
 * Remove older data if a time limit is specified
 
-
-== Database ==
+[[Image(datamanager.png, 40%, center)]]
+
+This approach allows to decouple the data acquisition from the data treatment and in addition provides a tunable persistent storage of the sensed data.
+It is too very easy to simulate sensor networks by populating the database with an external script.
+
+=== Database ===
 
 The database is a MySQL database. The script below create the tables and the rows useful for the datamanager and the gateway.
-
 
 {{{