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Gulf Coast Data Concepts X16-1C Manual

Usb accelerometer
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1
Features
• 3-axis accelerometer
• Single gain mode set to +/-16g
• 15-bit resolution
• User selectable sample rate of 12, 25,
50, 100, and 200 Hertz
• User selectable deadband setting
• Accurate time stamped data using Real
Time Clock (RTC)
• Convenient on/off button
• Data recorded to a removable microSD
card (2GB included)
• Easily readable comma separated text
data files
• Data transfer compatible with Windows
or Linux via Universal Serial Bus
(USB) interface (no special software)
• System appears as USB Mass Storage
Device to Windows and Linux OS's.
• Standard replaceable "AA" type battery
• LED indicator lights for system status
• Weighs 2oz (55g) with alkaline battery
January 2012 Rev New
Figure 1: USB Accelerometer X16-1C
www.gcdataconcepts.com
USB Accelerometer
2
Applications
The X16-1C is applicable to:
• Continuous time stamped shock and
motion monitoring of critical freight.
• Monitoring human motor activity, or
actigraphy, such as exercise intensity or
sleeping disorders.
• Automotive performance monitoring
• Educational purposes
3
Description
The USB Accelerometer X16-1C uses a low
noise digital accelerometer sensor, precise time
stamped data logging, microSD memory
storage, real-time data access and USB
connectivity. Acceleration is collected in X, Y,
and Z axes and stored at a user selectable rate
of up to 200hz. When connected via the USB
to a personal computer, the X16-1C appears as
a standard mass storage device containing the
comma delimited data files and user setup files.
The commercial standard "AA" battery
provides extended life operation suitable to
long term data acquisition applications.
Model X16-1C
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Summary of Contents for Gulf Coast Data Concepts X16-1C

  • Page 1 • System appears as USB Mass Storage of up to 200hz. When connected via the USB Device to Windows and Linux OS’s. to a personal computer, the X16-1C appears as • Standard replaceable “AA” type battery a standard mass storage device containing the •...
  • Page 2 USB Accelerometer Model X16-1C Operating Instructions The X16-1C is a simple, economical solution to capture continuous motion data and quickly deliver the information for analysis. The following instructions outline the steps to begin using the X16-1C. Configuration settings and mounting methods will depend on the particular application.
  • Page 3 USB Accelerometer Model X16-1C Figure 2: Starting the X16-1C Electrical 3.2.1 Sensor Table 1: Accelerometer Sensor Characteristics Parameter Condition Typical Units Acceleration range ±16.0 Resolution 0.001 g/count Linearity X, Y, Z axis ±1 Zero-g Offset Level X, Y axis -150...

  • Page 4: Indicator Leds

    3.2.3.1 Main Battery The X16-1C is powered by a single “AA” sized battery. Typical operation times using an alkaline battery range from 3 to 7 days depending on system configuration, battery quality, and microSD card type. The RTC continues to operate from the battery when the device is “off”. The RTC should be reinitialized if the battery is removed or depleted.

  • Page 5: System Configuration Options

    3.2.4 System Configuration Options The X16-1C is configured using a set of tags and settings stored in a text file named “config.txt”, which is located in the root directory of the microSD card. The system reads the configuration file at boot time.
  • Page 6 USB Accelerometer Model X16-1C 3.2.4.1 deadband “deadband” defines the minimum difference between recorded sensor readings. A new sample from the accelerometer sensor must exceed the previous recorded reading before the microcontroller records the data. The deadband setting is expressed in "counts" units and is applied to the output of each axis.
  • Page 7 ZZ are spurious digits that should be ignored. The micro-resolution option should be implemented at sample rates of 100 hertz or greater to provide the best timing precision. The power saving features of the X16-1C are disabled in micro-resolution mode and battery life is shortened accordingly.

  • Page 8: Sample Rate

    “stoptime” tags. The times must be in “DD MM HH” 24-hr format with the three entries separated by a space. Entries marked with “*” operate as a wild card. The X16-1C continues to record after the start time unless defined otherwise by the stoptime tag. Note that the configuration option does not include the month.

  • Page 9: Example Configuration Files

    USB Accelerometer Model X16-1C 3.2.4.12 timeoutonusb The “timeoutonusb” tag returns the microprocessor to normal operating speed if no USB communications are detected within 7 seconds after connection to a USB port. This reduces the power requirements when operated from an external 5v USB supply. By default, the microprocessor continues at high-speed mode waiting for USB communications.

  • Page 10: Data Files

    1024. Table 3 lists the valid header tags, although not all tags may occur in the header. The X16-1C creates a new data file when the system is booted or when the maximum number of data lines is reached in the previous data file. A system boot condition occurs when the on/off button is pressed, 5v power is restored to the system via the USB connector, or when the X16-1C is removed from a computer USB port with the “rebootondisconnect”...
  • Page 11 The current time when the data file was created TEMPERATURE Temperature of sensor in °C when data file was created TITLE The name of the USB Accelerometer X16-1C unit VERSION The version control information of the USB Accelerometer firmware Figure 9: Example Data File...

  • Page 12: Real Time Clock

    3.2.6 Real Time Clock A real time clock (RTC) is integrated into the X16-1C system and is used to determine time for each line of data recorded. The RTC maintains ±2ppm accuracy (0°C to +40°C) and is powered by the primary battery.
  • Page 13 0.75” long #6-32 screw and nut. Longer screw lengths can facilitate attachment of the X16-1C to other structures. A slip-on cap protects the USB connector. The X16-1C weighs 2oz (55g) with an alkaline battery.
  • Page 14 XLR8R is included on the microSD card of each X16-1C unit or can be downloaded from the website at www.gcdataconcepts.com. For data analysis, Gulf Coast Data Concepts recommends using a commercial or open source mathematics package, such as MatLab, Microsoft Excel, OpenOffice Calc, Octave, R, or similar applications.

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