Universal micro electromechanical system (MEMS) pedometer and step counting method
A system pedometer and micro-electromechanical technology, applied in the direction of instruments, measuring devices, surveying and navigation, etc., can solve the problems of easy damage, low step counting accuracy, and large pedometer size, and achieve strong adaptability and long battery life. Ultra-long, simple and reliable circuit effect
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[0028] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the universal MEMS pedometer according to this embodiment is characterized in that it includes a single-chip microcomputer 1, a MEMS three-axis acceleration sensor 2 and a segment liquid crystal display 3.
[0029] Single chip microcomputer 1 includes FIR digital low-pass filter module 1-1, data processing module 1-2 and display control module 1-3,
[0030] The MEMS three-axis acceleration sensor 2 is used to collect the acceleration when the person is walking. The acceleration signal of the MEMS three-axis acceleration sensor 2 is input to the FIR digital low-pass filter module 1-1 through the SPI interface, and the FIR digital low-pass filter module 1- The filter signal output terminal of 1 is connected to the collected data signal input terminal of the data processing module 1-2, the step counting signal output terminal of the data processing module 1-2 is connected to the step c...
Example Embodiment
[0034] Specific implementation manner 2: the following combination figure 1 This embodiment will be described. This embodiment will further explain the first embodiment. This embodiment also includes a battery power supply system 4 and a power monitoring display 5. The battery power supply system 4 is used to provide a single-chip microcomputer 1, a MEMS three-axis acceleration sensor 2 and a segmented liquid crystal The display 3 provides working power, and the power signal output terminal of the battery power supply system 4 is connected to the power signal input terminal of the power monitoring display 5.
[0035] In addition to displaying the power status of the battery-powered system 4, the power monitoring display 5 can also monitor whether the battery-powered system 4 is working normally.
Example Embodiment
[0036] Specific implementation manner 3: This implementation manner further describes the implementation manner 1 or 2, and the model of the single-chip microcomputer 1 in this implementation manner is MSP430.
[0037] The single-chip microcomputer 1 in this embodiment adopts the 16-bit ultra-low-power single-chip MSP430F4152 launched by TI, which has 16KB Flash, 512B RAM and many peripherals, and the current is only 0.9uA in the low-power mode. It has 48 I / O ports and a temperature sensor, as well as a flexible and practical timer. It has 2 USARTs supporting I2C and SPI bus interfaces, which can communicate with the acceleration sensor LIS3DH; it can directly drive up to 144 segments of LCD; and there are 8 channels of 10-bit AD converters to monitor the battery voltage.
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