Please read below. Somehow the full conversation went private instead of going to list hence I am copying it here. Hope it helps :)
On Sun, Jan 27, 2008 at 6:31 AM, Edmund J <[EMAIL PROTECTED]> wrote: > oh thank you very much for your reply.. cheers. > > Regards, > Edmund > > *Nilesh Mishra <[EMAIL PROTECTED]>* wrote: > > Essentially the 301 (256+45) figure does the 2's complement (256 - value) > as well as adds (-45 dBm) to the value reported from the radio register (as > specified in the MSP430 manual). So essentially the formula can be written > as - (256 - value) + (-45) = value - 301. > Cheers, > Nilesh > > On Jan 26, 2008 12:32 AM, Edmund J <[EMAIL PROTECTED]> wrote: > > > hi, > > thanks for the reply. So am i right to say that if i get 0xFA in hex > > covert to decimal is 250 and then i subtract 301 from it? 250-301 = -96 dB? > > i no ned to do any 2 complement right? why subtract 301? u have any idea? > > because i need to write a report on it. thanks alot. cheers. > > > > Regards, > > Edmund > > > > *Nilesh Mishra <[EMAIL PROTECTED]>* wrote: > > > > Quickfix: Treat the number as a uint8_t and then subtract 301 from it. > > For example the default RSSI threshold value used for deciding channel clear > > is -77 dBm which is stored as uint8_t value 224 (224 -301 = -77). So what > > ever value is returned from the register reading should be treated as a > > unsigned integer and then subtract 301 from it. > > > > Details: Please read the MSP430 datasheet for more clarification. > > > > Thanks, > > Nilesh > > > > On Jan 25, 2008 11:15 PM, Edmund J <[EMAIL PROTECTED]> wrote: > > > > > hi, > > > Anyone knows how to convert the RSSI value(the strength) of tmote sky > > > to db? e.g 0xFA to dB? thank you. > > > > > > Regards, > > > Edmund > > > ------------------------------ > > > Search. browse and > > > book<http://sg.rd.yahoo.com/spirit/fea/travel/*http://sg.travel.yahoo.com>your > > > hotels and flights through Yahoo! Travel > > > > > > On Sun, Mar 23, 2008 at 9:16 PM, naveen reddy <[EMAIL PROTECTED]> wrote: > Hi every one, > > I am working on micaz mudules and i need rssi value of received > signal....i used pong application and got some value of rssi....now how to > convert it to actual rssi value in DB...wat i felt > is to get 2's complement of obtained value and add -45(offset) to it....is > that right??????Thaking in advance.... > > regrads, > naveen, > IIT Bombay. > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- Regards Nilesh Nilesh Mishra Embedded Networks Laboratory University of Southern California, 3710 S. McClintock Avenue, Ronald Tutor Hall (RTH) 418 Los Angeles, CA 90089 mail: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] ph: (213) 821-5627 (lab)
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