User Manual

30
ATZB-EVB-XXX-XXX User Manual
AVR-09-2011
Joined to
network
ON
+ receiving
data
blinking
+ sending
data
(coordinator
only)
blinking
Sleeping (end
device only)
OFF OFF OFF
If you power ON the coordinator, it switches to an active state, even though no child
node is present. This is normal, it means that the coordinator is ready and child nodes
can join the network with coordinator’s PAN ID.
By default, coordinator uses predefined PAN ID valued as D170, which is recognized
by all routers.
NOTES:
If coordinator is absent or it has not been turned on, the routers are
staying in the network search mode. In this mode, routers are
scanning the selected frequency channels in search for a network with
the selected PAN ID.
In rare cases, if radio channel is busy on the selected frequency the coordinator node
is staying in the network searching mode. If this happens, you should switch it to
other channel by changing the channel mask in WSN Monitor.
5.5 Sensors Data and Battery Level Indication
Each of the boards measures temperature, light and its own battery level. They send
the data values to coordinator and, further to the PC. The WSN Monitor displays the
readings from onboard sensor’s next to a node icon along with visualization (see
Section 5.6).
Temperature sensor measures ambient temperature. The sensor data is depicted in
the WSN Monitor charts with resolution of 1 °C, but the actual sensor accuracy is
better. Light sensor measures ambient illumination in Lux. The battery voltage is
indicated with typical accuracy of about 0.1 V, which is enough for most applications
and self-monitoring tasks.
NOTES:
In case the board is powered via USB port, the battery voltage sensor
will steadily return 0. However, if batteries had been installed into the
battery compartment, when the board is connected to the USB, the
battery level indication is correct.
In case the board is powered via USB port, the heating voltage
regulator, which is located next to the temperature sensor, can distort
the sensor readings. Use battery-powered boards for more accurate
measurements.