Hi,We're trying to do a simple RSSI strength to distance calibration using Mica2 motes and TinyOS1.1.0
The program is simple:- A chirp mote to send an IntMsg packet with no data in it at 500ms intervals.
- 4 listener motes to read the message from the chirp, take the strength byte from TOSMsg and wire it to the val byte of IntMsg and transmit it back over the radio.
- A TOSBase mote to listen to all packets. The reading of packets etc works fine.However, the distance to strength values don't seem to match. When the chirp mote is moved away from the listener motes, instead of going down, the strength value is random.
In the attached figure, the chirp mote was placed right next to the listener and then moved steadily farther away. The plot was made at 1second intervals.
As you can see, the value seems to be completely random. Any suggestions will be greatly appreciated.
Sankar Gorthi.
strengthmeasured.png
Description: PNG image
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