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

[Ole Bischoff]

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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