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Thread: Custom USB tyre pressure monitoring interface

  1. #1071
    Newbie
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    that is just some mad skills dude

    i did not get 60 percent o what you said in the first post ut that is frikkkiinn awesome

  2. #1072
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    Hello
    Where could it get the firmware for the Microchip PIC 18F2550 microcontroller.
    mfg

  3. #1073
    Lok
    Lok is offline
    VENDOR - Portal Media Lok's Avatar
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    Quote Originally Posted by lordin View Post
    Hello
    Where could it get the firmware for the Microchip PIC 18F2550 microcontroller.
    mfg
    I am sorry lordin but the firmware is proprietary information and can not be distributed.

  4. #1074
    FLAC WuNgUn's Avatar
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    Hey Alok...have you been in touch with the writers about making a plugin for the new CF3?

  5. #1075
    Maximum Bitrate vicky_obee's Avatar
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    Hi Alok
    need a small help here with tpms..
    I am using Robbys Skin and have only modified to 5 tires ( instead of 4 )
    All works out fine but for the Aural warnings...
    I am not able to get the audio warnings for the press or temp...

    I01,219,80,40,71,"TMS_ALERT_FL:B"
    I02,381,79,39,72,"TMS_ALERT_FR:B"
    I03,216,346,40,76,"TMS_ALERT_RL:B"
    I04,385,345,38,74,"TMS_ALERT_RR:B"
    I05,644,28,138,161,"TMS_ALERT"
    I06,693,513,28,18,"TMS_SILENT:B" ( DO I HAVE TO REMOVE THIS LINE )
    I07,288,408,68,71,"TMS_ALERT_ST:B"
    B01,630,507,97,86,"TMS_SILENT","" ( Or DO I HAVE TO REMOVE THIS LINE or both )
    B02,727,507,67,86,"EXIT",""

    if i do it like this /B01,630,507,97,86,"TMS_SILENT","" the red indiacator doesnt work any more and still there is no audio warning..
    ive tried all 3 combinations but still i get no AUDIO warnings..
    The music keeps playing.. ( so it means the vol is ok and not mute )

    Can you pls help from here
    Thanks
    Commell LV-677 DC 6 x 6" Mother Board
    2.6 GHz; 1 Gb Ram
    120 Gb Laptop HD
    7" InDash Xenarc MTD - X7000 Screen
    Gyration Mouse ; GPS Mouse ; ELM Scan ; TPMS
    Parrot MK 6000 & iPhone
    ----------
    Re done the carputer...Into the Glove Box !!

  6. #1076

  7. #1077
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    This is not the place to advertise goods for sale.

    Please use the classifieds

    Este no es el lugar para anunciar productos en venta.

    Por favor, utilice los clasificados
    Que la ignorancia no sea el limite.

  8. #1078
    lez
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    Quote Originally Posted by aveigal View Post
    This is not the place to advertise goods for sale.

    Please use the classifieds
    what u on about noob

    anyway, does the dark haired one have a name, much prefered to the blond.


    omg i'm sinking.......
    Lez, more widely known as flez1966

  9. #1079
    riv
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    Porting the TPMS to Linux. Please help!

    This is what we have discoverer so far:

    Raw Data Buffer

    Byte 0: Pressure Byte (Bar)
    Scaling = 0.025 Bar/LSB
    Zero Point = 0x28
    Formula:
    P = (PB - 40)*0.025
    Samples:
    0x26 = -0.05 Bar
    0x27 = -0.025 = -0.03 Bar
    0x28 = 0.00 Bar
    0x6D = 1.725 = 1.73 Bar
    0x7B = 2.075 = 2.08 Bar

    Byte 1: Temperature Byte (Celsius)
    Scaling = 1 C/LSB
    Zero Point = 0x28
    Formula:
    T = TB -40
    Samples:
    0x2D = 5 C
    0x2E = 6 C
    0x3E = 22 C
    0x40 = 24 C

    Byte 2: Battery Level Byte
    Relative level of battery. I think the range is from 0x00 0xFE.
    For the manipulation of this byte to actual V I need to know lowest battery voltage on which the sensor could work and type of the battery.

    Byte 3: Sensor Mode Byte
    It sounds like this byte represents status of the sensors, as per below table (Sensor Modes).
    NormalMode = 0x01


    Sensor Modes
    http://www.mp3car.com/vbulletin/port...erface-19.html

    Mode Description
    Storage Mode
    If the pressure is below 1.5 bar, pressure is measured every 60 seconds but no data is sent. If the pressure increases above 1.5 bars, the sensor shifts into the Initial mode.
    Initial Mode This mode occurs if the pressure increases above 1.5 bar from Storage mode. In this mode, pressure is measured every 0.85 seconds and data is sent every 0.85 seconds. This sequence is repeated 256 times. After the sequence is repeated 256 times, the sensor shifts into the Normal mode only if pressure is above 1.5 bar. If the pressure is below 1.5 bar, the sensor will shift into the Storage mode.

    Normal Mode
    Pressure is measured every 3.4 seconds and data is transmitted every 60 seconds. If the measured pressure differs by more than 200 mbar from the reference taken every 60 seconds, the sensor enters a Pressure Alert mode.

    Pressure Alert
    It is the same measurement and transmitting pattern as the Initial mode.

    High Temp Alert
    If the temperature exceeds 120C, the sensor device enters into the same measurement and transmitting pattern as the Initial mode.

    ------------------------------------------------

    HID Protocol
    To poll a sensor data:
    1. Host writes one byte to device with required sensor number coded as 0x20 + SensorIndex. First Sensor index equals to 1.
    2. Host reads the four bytes buffer from device. Structure of buffer is explained above.


    Please help me to fill the gaps and misunderstandings.

    Thanks

  10. #1080
    Variable Bitrate
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    I'm hoping someone Robby or Lok or Dejan still has the PIC chips by them self for sale?

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