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A general application for wireless sensor networks is gathering sensor data from the deployed motes and making some predication/operation based on those sensed data. In this page, you will learn how to do this based on OpenWSN project.

Hardware you need

2x OpenMotes
1x OpenBase
1x mini B cable
A computer running the OpenWSN environment installed

Procedures

Program two OpenMotes
The uinject application running on the mote generates dummy data (a counter value increasing at each packet) every 30 seconds and sends it to the manager.
By default, this app is disabled. You can enable it following those procedures. Compiling them and download the code to your motes after you did those modification.
- uncomment this line: https://github.com/openwsn-berkeley/openwsn-fw/blob/develop/openapps/openapps.c#L44
- add uinject at defaultAppsInit structure: https://github.com/openwsn-berkeley/openwsn-fw/blob/develop/openapps/SConscript#L34
connect one to your computer and power on the other one
on your computer, double-click on uinject_dagroot.py (folder openwsn-fw/openapps/uinject)
you need to change a little bit in uinject_dagroot.py to make it work on your computer
- change the serial port according to your case: https://github.com/openwsn-berkeley/openwsn-fw/blob/develop/openapps/uinject/uinject_dagroot.py#L239
- add following code at : https://github.com/openwsn-berkeley/openwsn-fw/blob/develop/openapps/uinject/uinject_dagroot.py#L161 ,(For the last test, this is no required for OpenMote. Try this if the mote stay at reset status.)
  self.serial.setDTR(0) self.serial.setRTS(0)
That's It!

Result

The uinject_dagroot.py application prints on screen what you are receiving from the other mote, which is the counter value increasing from 0.Once the printing works you can:

make uinject fancier to include real sensor data. I would recommend to then rename the application
make the uinject_dagroot.py fancier and log/send/tweet the received data

Besides, the latency of each packet starting from being generated until received by dagroot is printed on screen right after the counter. It's shown in seconds and the accuracy is one slot long which is 15ms.