1.0 WSN802G Introduction
The WSN802G transceiver module is a low cost, robust solution for 802.11b/g/n sensor networks. The
WSN802G is unique in that it is able to sleep while still remaining a member of an 802.11b/g/n network.
The WSN802G’s low active current and very low sleep current makes long life battery operation practical.
The WSN802G module includes analog, digital and serial I/O, providing the flexibility and versatility
needed to serve a wide range of sensor network applications. The WSN802G module is easy to integrate
and is compatible with standard 802.11b/g/n routers.
8 0 2 .1 1 b /g N e tw o r k w ith W S N 8 0 2 G
S e n s o r N o d e s
W S N 8 0 2 G
S e n s o r
N o d e 1
8 0 2 .1 1 b /g
L a p to p
A p p lic a tio n
S e rv e r (P C )
8 0 2 .1 1 b /g
R o u te r
8 0 2 .1 1 b /g
P r in te r
W S N 8 0 2 G
S e n s o r
N o d e 2
Figure 1.0.1
An example 802.11b/g/n network with WSN802G sensor nodes is shown in Figure 1.0.1. A sensor net-
work application running on a server or PC communicates with one or more WSN802G sensor nodes
through a commercial 802.11b/g/n router. WSN802G sensor nodes can be used with 802.11b/g/n routers
that are also serving other applications.
W S N 8 0 2 G S e n s o r N o d e w ith
D ir e c t S e n s o r In te r fa c e
A D C 0
A D C 1
A D C _ R E F
P W M 0
G P IO 0
W S N 8 0 2 G S e n s o r N o d e w ith
H o s t M ic r o c o n tr o lle r
R A D IO _ R X D
R A D IO _ T X D
/H O S T _ C T S
/H O S T _ R T S
W A K E _ IN
W S N 8 0 2 G
G P IO 1
G P IO 2
G P IO 3
S P I S ig n a ls
W S N 8 0 2 G
W A K E _ O U T
G P IO 0
G P IO 1
G P IO 2
G P IO 3
S P I S ig n a ls
H o s t
M ic r o c o n tr o lle r
a n d
S e n s o r
I/O
A n a lo g
a n d /o r
D ig ita l
In p u ts
+
W A K E _ IN
R A D IO _ R X D
R A D IO _ T X D
/H O S T _ C T S
/H O S T _ R T S
A n a lo
a n d /o
D ig ita
O u tp u
r
g
l
ts
R S 2 3 2
C o n v e rte r
S e r ia l
I/O
R S 2 3 2
C o n v e rte r
S e r ia l
I/O
Figure 1.0.2
A WSN802G module is integrated with other components to create a complete sensor node. These com-
ponents include a host circuit board, a power supply (battery), sensor I/O electronics and/or a host micro-
controller, and a housing (external antenna also required on some WSN802G models). Two common
configurations are show in Figure 1.0.2. Serial sensor data communication between a WSN802G module
and its host microcontroller requires no protocol formatting. The WSN802G formats data received from its
host into UDP packets for RF transmission, and delivers the payload data from received UDP packets to
its host. The sensor network application on the server or PC uses a simple protocol to send and receive
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WSN802G - 03/16/11
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