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Earthquake Click - MikroElektronika World’s Smallest High-Precision Seismic Sensor

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  • Earthquake Click - MikroElektronika World’s Smallest High-Precision Seismic Sensor

    Earthquake click carries D7S, the world’s smallest high-precision seismic sensor from Omron. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target MCU over I2C interface, with additional functionality provided by the following pins on the mikroBUS™ line: PWM, INT, CS.

    When an earthquake occurs with a seismic intensity equivalent to 5 Upper or higher on the JMA (Japan Meteorological Agency) Seismic Intensity Scale, the D7S will activate the shutoff output to notify the user that an earthquake has occurred.

    How it works

    Using the SI (spectral intensity) value, which has a high correlation with the seismic intensity scale that indicates the magnitude of an earthquake, provides higher-precision judgment of seismic intensity scales.

    The 3-axis acceleration Sensor and Omron's unique SI value calculation algorithm achieve high precision and low consumption. (Higher degree of freedom for incorporation into devices and prolonged operation on battery power).

    Shutoff output terminal (INT1) operates equivalent to a conventional mechanical vibration sensor and ensures compatibility with mechanical vibration sensors.

    I2C interface is able to obtain earthquake-related information from the sensor with communications from external devices.

    Spectral intensity

    The SI value (or spectral intensity) is equivalent to the magnitude of the destructive energy imposed by seismic motion on structures.

    Low power consumption

    The power consumption during standby is 90 μA or less. On average, during processing, the sensor uses around 300 μA.

    JMA seismic intensity scale

    JMA or Japan Meteorological Agency intensity scale is used in Japan and Taiwan to measure the intensity of earthquakes. The scale goes from 0 to 7. The level 5 on this scale indicates when objects inside a house start falling down, like books from the shelf, dishes in a cupboard, cracks are formed on walls, etc.


    Type Motion
    Applications Vibration sensor, fire prevention systems, electricity meters, gas meters, chemical plants, bridges, tunnels, etc.
    MCU D7S seismic sensor
    Key Features Low power consumption, Acceleration Detection Range −2,000 to 2,000 gal, Shutoff Output (INT1) Output at seismic intensity level 5 or higher
    Key Benefits The click can calculate seismic activity and detect an earthquake
    Interface GPIO,I2C
    Input Voltage 3.3V or 5V
    Compatibility mikroBUS
    Click board size S (28.6 x 25.4 mm)

    Pinout diagram

    This table shows how the pinout on Earthquake click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

    Notes Pin Mikrobus logo.png Pin Notes
    NC 1 AN PWM 16 INT2 Processing notification output
    NC 2 RST INT 15 INT1 Shutoff output
    Initial setting input SETTING 3 CS TX 14 NC
    NC 4 SCK RX 13 NC
    NC 5 MISO SCL 12 SCL I2C clock
    NC 6 MOSI SDA 11 SDA I2C data
    Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
    Ground GND 8 GND GND 9 GND Ground

    Maximum ratings

    Description Min Typ Max Unit
    Power Supply Voltage -0.3 6.0 V
    Average Current Consumption during Processing 300 uA
    Operating Temperature -30 70


    Code examples for Earthquake click, written for MikroElektronika hardware and compilers are available on Libstock.


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