This directory contains the compiled code for the Contiki energy
estimation demonstration for ACM SenSys 2007. More information is
available in the handouts/ directory and at the Contiki website:
http://www.sics.se/contiki/
* INSTALLATION INSTRUCTIONS
Cygwin and Java (JRE) needs to be installed. The demo has been tested
on Microsoft Windows, but probably works under Linux too.
You need between two and eight Tmote Sky boards to run the demo: one
sink and between one and seven nodes. The nodes are numbered from 42
to 48, and 41 is the sink node.
Step 1: Unpack the zip file
unzip contiki-energest-demo.zip
Step 2: Change directory to the demo directory
cd contiki-energest-demo
Step 3: Connect the sink node to the PC. Remove all other Tmote Sky
nodes from the PC.
Step 4: Upload Contiki to the sink:
make upload-sink
Step 5: Remove the sink node from the PC.
Step 6: Connect one of the non-sink nodes to the PC
Step 7: Upload Contiki to the node:
make upload-node-42
This takes some time. The red LED should be lit when the
uploading is finished. We have found that in some cases brand
new Tmote Sky boards seem to cause a problem with Contiki and
the red LED does not light up. If so, try to wait a few
minutes (~10 minutes) with the Tmote Sky either inserted in
the PC, or powered with batteries. If the red LED goes on
after these minutes, repeat the "make upload-node-XX" to
upload Contiki again.
Step 8: Remove the Tmote Sky from the PC.
Step 9: Insert batteries into the Tmote Sky. The red LED should light
up.
Step 10: Repeat step 6 to step 9 for all non-sink nodes. Replace "make
upload-node-42" with "make upload-node-43", "make
upload-node-44", and so on.
Step 11: Insert the sink node to the PC again.
Step 12: Run the Java program:
make rundemo
NOTE: this uses the first Tmote Sky it finds as a
sink. Therefore, make sure that only one Tmote Sky (the sink) is
inserted.
Step 13: Push the "user" button on the Tmote Skys and watch their
power consumption go up and down.
* DEMO DESCRIPTION
Contiki continuously estimates the energy consumption of the
system. In this demonstration, seven Tmote Sky nodes, running Contiki,
estimates their energy consumption and send their power to a sink
node. The sink node is connected to the PC, and reports the nodes'
power to a Java program. The Java program shows the nodes' power
consumption for the last second.
When pushing the button on the nodes, they cycle through seven states
as below. This is reflected by their power consumption, as shown in
the Java program. The different states are:
* Red LED: sending one packet per second
* Green LED: radio listen 1% duty cycle
* Green, red LEDs: radio listen 10% duty cycle
* Blue LED: radio listen 100%
* Blue, red LEDs: radio listen 10%, CPU low-power mode disabled
* Blue, green LEDs: sending data 1.2 kilobytes/second
* Blue, green, red LEDs: sending data 12 kilobytes/second
When sending data, the radio is turned on for a while before the
transmission to check if it is possible to send the packet. This is
the reason why energy is spent on radio listening even when the nodes
are only sending data.
