Ankle type step counter based on single-shaft micro-mechanical accelerometer

A technology for accelerometers and pedometers, which is applied to measuring devices, instruments, surveying and navigation, etc., can solve problems such as complex calculation methods, high costs, and complex structures of 3-axis MEMS micro-mechanical accelerometers, and achieve simple measurement methods, Low cost, the effect of eliminating external vibration interference

Inactive Publication Date: 2016-09-21

UNISPLENDOUR CO LTD

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Problems solved by technology

[0006] (2) The calculation method is complicated. First, the acceleration in the up and down directions must be calculated according to the detection signals of the MEMS accelerometer in three directions, and then a certain algo...

Method used

The pedometer of the present invention directly detects the impact on the sole of the foot and the ground at the ankle, and uses the number of times of impact on the sole of the foot to carry out step counting. Since the pedometer is close to the vibration source, the impact of the human body on the vibration of the sole of the foot is greatly reduced. Attenuation effect, so the sensitivity of detection is improved, it is not sensitive to vibration in...

Abstract

The invention relates to an ankle type step counter based on a single-shaft micro-mechanical accelerometer, belonging to the technical field of detection of human motion information. The ankle type step counter comprises a shell, a circuit board, a single-shaft acceleration sensor, a Bluetooth module and a Bluetooth antenna, wherein the shell is worn on an ankle by virtue of an ankle strip, the circuit board is fixed on the shell, and electronic components including the single-shaft acceleration sensor, the Bluetooth module and the Bluetooth antenna are fixed on the circuit board; and a signal output end of the single-shaft acceleration sensor is connected with a signal input end of a single chip microcomputer in the Bluetooth module, and a radio-frequency signal output end of the Bluetooth module is connected with a signal input end of the Bluetooth antenna. According to the ankle type step counter, the step is counted by directly detecting the impacting number of times between the sole of a foot and the ground, the single-shaft acceleration sensor approaches a vibration source, and then the attenuation of a human body to the vibration of the sole of the foot is substantially reduced, so that the detection sensitivity is improved, and the anti-interference capacity is relatively strong.

Application Domain

Distance measurement

Technology Topic

AccelerometerComputer science +13

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Examples

Experimental program(1)

Example Embodiment

[0014] The ankle pedometer based on a single-axis micromechanical accelerometer proposed in the present invention has a structure such as figure 1 As shown, it includes: housing 1, circuit board 5, single-axis micromechanical accelerometer 2, bluetooth module with built-in single-chip microcomputer 3, Bluetooth antenna 4; housing 1 is fixed on the ankle by a wrist strap; circuit board 4 is fixed on On the shell 1. Electronic components such as the single-axis micromechanical accelerometer 2, the bluetooth module 3 with built-in single-chip microcomputer, and the Bluetooth antenna 4 are fixed on the circuit board 4. The signal output terminal of the single-axis micromechanical accelerometer 2 and the single-chip microcomputer signal in the bluetooth module 3 The input end is connected, the signal output end of the Bluetooth module 3 is connected to the signal input end of the Bluetooth antenna 4, such as figure 2 Shown.

[0015] The functions of each device of this device are:

[0016] Shell 1 is used to input the vibration generated when the sole of the foot hits the ground.

[0017] The single-axis micromechanical accelerometer 2 is used to convert the acceleration physical signal generated by the housing 1 into an electrical signal, and the sensitive direction of the single-axis micromechanical accelerometer is perpendicular to the sole of the foot;

[0018] The bluetooth module 3, built-in single-chip microcomputer, is used to determine the peak value of the acceleration electric signal and count, and finally modulate the step counting data into a 2.4GHz radio frequency signal and output it to the Bluetooth antenna 4;

[0019] The Bluetooth antenna 4 is used to wirelessly transmit the 2.4GHz radio frequency signal output by the Bluetooth module 3 to the smart phone for step counting data display;

[0020] The circuit board 5 is used to fix and connect the single-axis acceleration sensor 2, the Bluetooth module 3 and the Bluetooth antenna 4, and transmit the vibration of the housing 1 to the single-axis acceleration sensor 2.

[0021] In an embodiment of the ankle-type pedometer device of the present invention, the ADXL190 single-axis micromechanical accelerometer of ADI Company of the United States is used; the CC2541 basket tooth module produced by TI Company is used, and the module has built-in enhanced 8051MCU and 256KB programmable flash memory And 8KB RAM; use Johanson's 2450AT45A100 ceramic patch antenna.

[0022] In the ankle-type pedometer device of the present invention, the electronic components such as the single-axis acceleration sensor, the blue tooth module and the Bluetooth antenna are fixed on the circuit board, the circuit board is fixed in the housing, and the whole pedometer device is worn with a wrist strap. The ankle of the person.

[0023] The working principle of the ankle type pedometer of the present invention is:

[0024] When a person is walking, there will be intermittent impacts between the soles of the feet and the ground. The vibration generated by the impact is transmitted to the single-axis acceleration sensor 2 in the pedometer through the ankle. The single-axis acceleration sensor 2 converts the acceleration physical signal generated by the vibration into For electrical signals, the single-chip microcomputer in the bluetooth module 3 performs threshold judgment and counts on the acceleration electric signals. The bluetooth module 3 modulates the step counting data into a 2.4GHz radio frequency signal and outputs it to the Bluetooth antenna 4. The Bluetooth antenna 4 finally transmits the radio frequency signal wirelessly Way to transfer to a smartphone.

[0025] The pedometer of the present invention directly detects the impact between the sole of the foot and the ground at the ankle, and uses the number of impacts between the sole of the foot and the ground to count the steps. Since the pedometer is close to the vibration source, the attenuation effect of the human body on the sole vibration is greatly reduced. Therefore, the detection sensitivity is improved, and it is insensitive to vibration interference caused by external factors such as elevators and vehicles, and has a strong anti-interference ability. The ankle pedometer of the present invention uses a single-axis acceleration sensor to sense the acceleration generated by the impact between the sole of the foot and the ground during walking, and has higher sensitivity, strong anti-interference ability, simple structure and low cost than a pedometer based on a 3-axis acceleration sensor.

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Easy to measure

Ankle type step counter based on single-shaft micro-mechanical accelerometer

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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