Re: [Tinyos-help] Raw Temperature readings Conversion to meaningfulDegree Celcious values

Ole Bischoff Mon, 17 Jul 2006 06:29:10 -0700

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="" 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: [email protected]

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="" 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="" 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="" 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="" 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="" 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="" 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="" 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="" 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="" 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="" 0x0 0x0 0x0 0xee 0x1 0x7e 0x0 0x3 0x0 0x7e 0x0 0xff 0xff 0xff 0xff 0x0 0x0 ]

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Re: [Tinyos-help] Raw Temperature readings Conversion to meaningfulDegree Celcious values

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