I understand now the ADC count, thank to you. I tried [EMAIL PROTECTED]:tmote and I do get cleaner messages of the following structure
08 00 00 00 00 00 7E 00 65 7D 00 00 01 00 00 00 00 00 08 00 00 00 00 00 7E 00 65 7D 00 00 01 00 00 00 00 00 08 00 00 00 00 00 7E 00 65 7D 00 00 01 00 00 00 00 00 ... But this message continues with the same numbers and letters and nothing change regardless of tmote temperature. When I use the Trawler I notice the change in the temperature significantly in the graph and the ADC counts. Is there any difference between what is displayed by the "listen" and what is plotted by the Trawler? I mean where is the measurements and what bytes the Trawler is plotting? Is there a different way to look for the Delta message structure (i.e. different from what is shown above by listen command) what I should I do? Regards, SAIF -----Original Message----- From: Michael Schippling [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 31, 2007 5:01 PM To: Saif A. Al-Hiddabi Cc: 'Tinyos-Help' Subject: Re: Where is the sensor reading in the received message? Try [EMAIL PROTECTED]:tmote for your MOTECOM, I believe it will select some special parsing for tmote messages. At least it let me receive Delta msgs with Listen. You'll have to go look at the Delta message structure to see which bytes are of interest, I don't know offhand. As to the 3000 value...I think we're talking a 12bit ADC whose max value would be 4096 (if I remember any binary math....). So it's about 3/4 of the full scale reading. You might google info about calibrating the sensor, but in general you can say 3000 is your room-temp-plus- tmote-heat and go from there. MS Saif A. Al-Hiddabi wrote: > Hi: > > I am new to using Tmote and started by testing the Delat application that > came with the quick start guide. I can see the internal temperature in the > Trawler scope measured with DC counts (approx 3000) (I do not know what ADC > count mean?) but I see changes in this value if I pass the Tmote near a heat > source :) Now I tried to see the message that the Tmote is sending through > COM4 port so I typed in the cygwin > $ export [EMAIL PROTECTED]:57600 > $ java net.tinyos.tools.Listen > > And I get the following > > TOS_Msg length is invalid: header_length=5,real_length=18 ... modifying msg > to fit > Received message:08 00 00 00 00 00 7E 00 65 7D 00 00 01 00 00 00 00 00 > 08 00 00 00 00 > TOS_Msg length is invalid: header_length=5,real_length=18 ... modifying msg > to fit > Received message:08 00 00 00 00 00 7E 00 65 7D 00 00 01 00 00 00 00 00 > 08 00 00 00 00 > > And it continues like this. > > My question is where is the temperature reading in this message? And why the > numbers/letters in this message are not changing if the temperature around > the Tmote is changing? I tried to read the Tmote message (i.e. the > temperature) using another program that can read serial message from COM4 > but I am getting this > 7E 42 08 00 00 00 00 00 7D 5E 00 65 7D 5D 00 00 01 00 00 00 00 00 0D 31 7E > 7E 00 > 7E 42 08 00 00 00 00 00 7D 5E 00 65 7D 5D 00 00 01 00 00 00 00 00 0D 31 7E > 7E 00 > And it continues like this? So how to retrieve the sensor measurement from > such message? > > I appreciate your help.. > > Thanks > > SAIF _______________________________________________ Tinyos-help mailing list Tinyos-help@Millennium.Berkeley.EDU https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
