[Tinyos-help] Raw Temperature readings Conversion to
meaningfulDegree Celcious values
Ole Bischoff
s01item2 at item.uni-bremen.de
Tue Jul 18 05:14:59 PDT 2006
Hy Muddesar,
as i said, the element data is a SPMessage-struct, which contains the element uint16_t reading. So the first
four bytes represents the sequence number (uint32_t seqno), the next two bytes are the sensor readings and so on.
Also the data is sent by the mote in little-endian format, that means the sensor reading in the example below is not
0xbe 0xb, but 0xb 0xbe (=3006).
[data=0x26 0x0 0x0 0x0 0xbe 0xb 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
| seqn | reading | ......
OLE
----- Original Message -----
From: Muddesar Iqbal
To: s01item2 at item.uni-bremen.de
Sent: Tuesday, July 18, 2006 1:41 PM
Subject: Re: [Tinyos-help] Raw Temperature readings Conversion to meaningfulDegree Celcious values
thanks a lot Ole for your help. actually i was using chanel 0 for external temprature sensor thats why i was getting wrong data i am using channel 1 now and it gives me same data as yours(more or less).
i am still confuse how did you convert
[data=0x26 0x0 0x0 0x0 0xbe 0xb 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ] to 0xbbe witch is equallent to 3006 in decimal
regards
muddesar
----------------------------------------------------------------------------
From: "Ole Bischoff" <s01item2 at item.uni-bremen.de>
To: "Muddesar Iqbal" <writeme at hotmail.co.uk>,"TinyOs Help List" <tinyos-help at Millennium.Berkeley.EDU>
Subject: Re: [Tinyos-help] Raw Temperature readings Conversion to meaningfulDegree Celcious values
Date: Mon, 17 Jul 2006 15:24:43 +0200
Hy Muddesar,
the data of your MultiHop-Msg is a SPMessage-struct ( .../moteiv/apps/Delta/Delta.h):
typedef struct DeltaMsg {
uint32_t seqno;
uint16_t reading;
uint16_t parent;
uint8_t neighborsize;
uint8_t retransmissions;
uint16_t neighbors[MHOP_PARENT_SIZE];
uint16_t quality[MHOP_PARENT_SIZE];
} DeltaMsg;
-> The sensor reading of your first msg [seqno=0xb7] is 0x01ec (byte-reverse-order)
(http://www.tinyos.net/tinyos-1.x/doc/tutorial/lesson6.html)
-> The formula for conversion the raw value to its corresponding voltage is:
vTemp = ADCvalue / 4096 * Vref, (Vref = 1.5V)
(.../moteiv/apps/Oscilloscope/README.TmoteSky)
-> The formula for conversion the voltage to its corresponding temperature [°C] is:
TempC = (vTemp - 0,986) / 0,00355
(MSP430 datasheet, page 18-21, http://focus.ti.com/lit/ug/slau049f/slau049f.pdf)
So your internal temperatur is about -227°C ?!
When i run the Dalta app on my TelosB mote i get values like:
[data=0x26 0x0 0x0 0x0 0xbe 0xb 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
this represents a sensor reading of 0xbbe -> temperature 32°C, which sounds realistic. Pherhaps you could measure
again with another TelosB mote to eliminate the possibility of hardware errors / broken sensor.
OLE
----- Original Message -----
From: Muddesar Iqbal
To: tinyos-help at Millennium.Berkeley.EDU
Sent: Monday, July 17, 2006 11:22 AM
Subject: [Tinyos-help] Raw Temperature readings Conversion to meaningfulDegree Celcious values
Hello every one,
Could any one help me with conversion of raw temperature data to meaning full temperature degree celcious values. I am using Telosb mote and receiving data using delta application .
regards
muddesar
P.S. Following are the raw readings I am receiving.
1153125556312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xb7]
[originseqno=0xb7]
[ttl=0x0]
[id=0x21]
[data=0x9d 0x0 0x0 0x0 0xec 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125561312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xb8]
[originseqno=0xb8]
[ttl=0x0]
[id=0x21]
[data=0x9e 0x0 0x0 0x0 0xef 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125566312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xb9]
[originseqno=0xb9]
[ttl=0x0]
[id=0x21]
[data=0x9f 0x0 0x0 0x0 0xee 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125571312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xba]
[originseqno=0xba]
[ttl=0x0]
[id=0x21]
[data=0xa0 0x0 0x0 0x0 0xec 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125576312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xbb]
[originseqno=0xbb]
[ttl=0x0]
[id=0x21]
[data=0xa1 0x0 0x0 0x0 0xea 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125581312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xbd]
[originseqno=0xbd]
[ttl=0x0]
[id=0x21]
[data=0xa2 0x0 0x0 0x0 0xec 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125586312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xbe]
[originseqno=0xbe]
[ttl=0x0]
[id=0x21]
[data=0xa3 0x0 0x0 0x0 0xf0 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125591312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xbf]
[originseqno=0xbf]
[ttl=0x0]
[id=0x21]
[data=0xa4 0x0 0x0 0x0 0xee 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125596312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xc0]
[originseqno=0xc0]
[ttl=0x0]
[id=0x21]
[data=0xa5 0x0 0x0 0x0 0xec 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
1153125601312 Message <MultiHopMsg>
[sourceaddr=0x1]
[originaddr=0x1]
[seqno=0xc1]
[originseqno=0xc1]
[ttl=0x0]
[id=0x21]
[data=0xa6 0x0 0x0 0x0 0xee 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]
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