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![[Free release] Vibration meter can be developed immediately! Reference design using accelerometer](/business/semiconductor/articles/143073_ADI_Article_Cover_sensing.png)
Accelerometers, which detect the tilt and vibration of objects, are becoming more compact and consume less power, and are being used in a variety of situations, such as structural health monitoring and seismic observation.
However, handling acceleration sensors requires specific know-how tailored to the vibration characteristics of the object to be measured. Engineers may have endless worries, such as "I don't know if it's suitable for me," or "I want to quickly collect and evaluate the necessary data."
Here we introduce a reference design that allows you to quickly develop a vibration meter equipped with Analog Devices' high-precision 3-axis MEMS acceleration sensor. Please read this book if you want to quickly develop new applications using vibration meters, or if you are worried about realizing a vibration meter using an acceleration sensor.
What are the use cases where the vibration meter plays an active role?
What kind of applications are vibration meters used for?
Typical use cases include:
(1) Structure soundness diagnosis (structural health monitoring)
By installing sensors in large structures such as buildings, factories, and bridges, measuring vibrations, and analyzing the data, we diagnose and predict invisible damage and deterioration. It can be used to quickly detect damage and ensure safety and preventive maintenance.
<Example>
・Performance evaluation and damage diagnosis by measuring vibration unique to buildings
・Deterioration monitoring system for early detection of defects in infrastructure such as bridges
(2) Seismic observation
Vibrometers are installed at observation points to obtain data on earthquakes and landslides. In addition to being used for disaster prevention research, it is also used for the purpose of instantly analyzing the damage situation of buildings, etc., and determining evacuation behavior, such as whether to stay in place or evacuate.
<Example>
・Quantitative observation of earthquakes and landslides
・Damage diagnosis of buildings by vibration monitoring after an earthquake
・Evacuation decision support application
(3) Condition monitoring of equipment and machinery
It can be installed on civil engineering construction machinery, agricultural machinery, industrial equipment, etc. to monitor its condition. It is becoming widely used for predictive maintenance using vibrations and for detecting the posture of robots.
<Example>
・Horizontal maintenance device for construction machinery, agricultural machinery, etc.
・Attitude detection system for industrial robots
・Navigation system for unmanned aircraft using inclinometer
Conventionally, vibration measuring instruments have been large and expensive, and not easily available. However, in recent years, it has become possible to accurately measure tilt and vibration using small, low-power consumption acceleration sensors, and there is a growing movement to install them in various locations and aggregate and utilize data via networks.
Reference design "MEMS Acc Logger" that allows you to quickly master the acceleration sensor necessary for the development of a vibration meter
What are the challenges in realizing such applications?
One of these is the difficulty of handling high-precision acceleration sensors.
For example, Analog Devices' 3-axis MEMS acceleration sensor "ADXL355" has a high accuracy of tilt angle detection of 0.1 degree, has industry-leading temperature characteristics and noise resistance, and can perform stable measurements even in harsh environments such as outdoors. . Other features include a full-scale output range of ±2g to ±8g, selectable frequency digital filtering from 1 Hz to 1 kHz, and low noise density of 25 µg/√Hz with less than 200 µA current consumption. It achieves the same performance as expensive devices, but with lower power consumption and material costs.
*For details regarding the acceleration sensor "ADXL355", please see below.
On the other hand, due to its high precision, even the slightest vibration applied to the chip can change the data that can be obtained, making it difficult for those without know-how to handle it. In addition, in order to extract sensor detection contents as data that can be used by higher-level applications, complex software control is required, and it takes time to build an evaluation environment.
We have received comments from application developers saying, ``We want to evaluate acceleration sensors more easily,'' and from developers on the embedded side, ``It's difficult to create a vibration meter from an acceleration sensor.''
Therefore, Macnica is now offering the "MEMS Accelerometer logger" reference design.
The 3-axis MEMS acceleration sensor "ADXL355" and the NXP microcontroller "LPC55S28JEV98" are mounted on a single board, making it possible to easily install it anywhere and acquire and evaluate acceleration data.
Features of MEMS Accelerometer logger
・Equipped with high-precision 3-axis MEMS acceleration sensor "ADXL355"
- Noise immunity (all axes) 25 μg/√Hz
- Low power consumption
- 20 bit ADC 3 axis digital output
- Measurement range ±2g, ±4g, ±8g
- Temperature characteristic 0.15mg/℃
・Built-in 32GByte large-capacity storage eMMC memory
・Equipped with 800mAh lithium polymer battery
・PC connection communication with USB, Android connection communication with Bluetooth
・It can also be used as a microcomputer evaluation board.
Advantages of using MEMS Accelerometer logger
・There is no need to build evaluation hardware and software, you can acquire accurate data from a high-precision acceleration sensor and immediately evaluate in an environment and size that is close to the actual environment.
・A high-performance vibrometer can be realized in a short period of time from hardware and software reference designs.
・By referring to the code of the sample application, the development period for your own application can be greatly shortened.
This is a reference design that can accelerate system evaluation and development according to the customer's various applications.
No initial cost! Rich development environment
MEMS Accelerometer logger is built using free development environment and tools. You can develop and evaluate accelerometers without a license or initial cost.
Free development environment
・NXP Software Integrated Development Environment (IDE)
・NXP Software Development Kit (SDK)
・FreeRTOS
Appearance specifications
hardware specs
hardware block
software block
You can use it immediately in practice! Providing sample applications
As samples, applications for PC and Android are available. You can easily connect to your PC / Android terminal via USB / Bluetooth and display the values measured by the acceleration sensor in real time.
<Function>
・Acceleration sensor operation mode setting
・ XYZ axis graph display
・ XYZ axis numerical display, Raw display
・ FFT analysis and result display (each XYZ axis)
・Inclination angle calculation and display (pitch/roll based on each XYZ axis)
・ CSV file saving (axis, FFT, tilt angle, time stamp, temperature)
We provide sample code that is close to the actual application, so you can use it as a reference for your own application development.
<Sample code example>
・ FFT analysis from acceleration sensor data
・Tilt angle detection
・Logging
·calibration
・How to use FIFO
Such
Evaluation PC application screen
Evaluation Android application screen
Free release of design data!
Start your development smoothly by making effective use of the MEMS Accelerometer logger.
You can download the hardware design materials and sample software for free if you fill in the application form.
Please download it from the button below.
*For those who wish, we also offer kit rental and software design materials. Please feel free to contact us.
Accelerometer introductory series
For those who are having trouble developing an acceleration sensor, Macnica provides a thorough explanation of Analog Devices' acceleration sensors, from basic usage to applications, in its "Introduction to Acceleration Sensors" series.
It has been well-received as "easy to understand and learn about accelerometers." Please take a look.
Application example
・Damage diagnosis of buildings and structures
・Inclination measurement at construction sites
Inquiry
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