Hi, I just want to get an accurate set of RSSI from a collection of received messages. What I understood, up to this moment, is that RSSI from the TOS message (received packet) is a) only a raw value (we need to convert it to a useful value, like dBm), and b) is DEPENDENT on the battery level of the mote which received the packet.
So, if the battery level of the mote is not considered (or "fixed" in 3V) in our samples, it means that our set of measures are not accurate as desired. I would like to confirm if I am right or not in this point. []s, Agnelo Silva On Mon, Jul 14, 2008 at 4:05 PM, wang wei <[EMAIL PROTECTED]> wrote: > hi > Im not sure why do u want the"battery voltage",(Do you wanna see differnet > RSSI value under different voltage?) actually, you cant measure the value of > battery, but you can control the transmit power > > good luck > Vi > > On Mon, Jul 14, 2008 at 11:56 AM, Agnelo Silva <[EMAIL PROTECTED]> wrote: > >> I am preparing the code to make the conversion of the "raw" RSSI value >> available in received message (indirectly a reading from ADC INPUT 0 - RSSI >> MONITOR). Although, I am developing using T1 (TinyOS 1.x), I read the T2 doc >> http://docs.tinyos.net/index.php/Rssi_Demo and noted the same thing I >> observed in some examples I saw in the Internet: what are about the battery >> reading for each message? >> >> I understood that, according to the manufacturer manual, VRSSI = 'raw >> counts' * battery voltage / 1024. So, for me, the correct code must present >> a reading of the battery before sending any 'raw RSSI' for conversion. >> >> Also, sometimes, I saw in some codes/messages, a direct use of '3' in the >> place of "battery voltage". Reading the schematic of the Mica2, I didn't see >> any voltage regulator to make such assumption and I am not sure about this >> approach considering the CC1000 data sheet. >> >> So, what I have in mind is to develop the algorithm to send informations >> to a certain procedure (internal function for locally conversion or external >> program): >> 1) First reading: send (battery level, raw RSSI) >> 2) Next reading: if the battery level doesn't change according to a >> certain threshold, send (raw RSSI) >> 3) Next reading: if the battery level does change according to a certain >> threshold, send (new battery level, raw RSSI) >> >> Please, I would like to hear if I misunderstood the topic "at all" or, if >> not, I would like to hear different solutions or suggestions. >> >> []s, >> Agnelo R. Silva >> >> >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > >
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