Questions tagged [mems]

Microelectromechanical systems (MEMS) are very small electromechanical devices. Common devices made using the technology include accelerometers, gyroscopes and microphones.

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64 views

How to convert pixel map to voltage/angles?

My end goal is trying to get something rendered using lasers and a MEMS scanning mirror. There are not that many resources online for this, but it seems like the basic idea is pretty applicable to ...
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1answer
56 views

Signal conditioning of the acceleration data from the ADXL 354

My project consists of the detection of a leak in a pipe using the vibration methode. I am using the MEMS accelerometer ADXL354. I selected the +/- 2g range. My problem is that the static acceleration ...
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1answer
53 views

How are objects rendered with a MEMS mirror for AR?

This question is an intersection of both hardware and software. I am trying to understand the theory of AR technology, but hitting some roadblocks and cannot find any good online resources that talk ...
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1answer
30 views

What changes when you modify gyro/accelerometer/magnetometer range?

In hobby-grade MEMS IMUs and MARGS such as MPU-6050, you can change certain registers on the chip and modify the sensor's range. For example 2 g or 8 g for an accelerometer. Of course, because the ADC ...
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1answer
858 views

Reading FIFO in LSM6DS3

What is the difference between reading the FIFO registers(FIFO_DATA_OUT_L,FIFO_DATA_OUT_H) and Sensor output registers(OUTX_L_XL to OUTZ_H_XL) both are same?which is recommended to get the raw data ...
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56 views

What is the output voltage and current necessary to operate the MEMS mirror?

I am trying to develop a driver to control a MEMS mirror by Mirrorcle. The specific component is A8L2.2-5000AU-TINY48.4. The data sheet only includes VdifferenceMax and and frequency information, but ...
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0answers
36 views

Frequency response of accelerometer MMA7361L

In order to create the model of the MEMS accelerometer MMA7361L I'm going to need the frequency response of it, but I don't have access to the university lab to use the oscilloscope because of the ...
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1answer
35 views

What does ST mean with “Temperature Offset” for the temperature sensor in their IMUs?

When reading the datasheet of the LSM6DSO32 IMU I noticed on p. 29 the characteristics of the integrated temperature sensor (see screenshot below): The sensor gives a digital reading of 0 for a ...
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1answer
321 views

Understanding Pressure MEMS Technical Information (Relative and Absolute Accuracy)

In my research, I use smartphones pressure sensor data, and I need to understand their errors and limitations. I found the technical chart for the sensor: But I don't really understand the meaning of ...
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28 views

How to compute the substrate doping concentration given parameters to compute Effective Gate Length?

I have been struggling with this homework question all weekend, and given it's Easter, I turn to the mercy of your all's wisdom given my University resources are unavailable. Any help you all could ...
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2answers
125 views

Pressure sensor for COVID19 medical equipment [closed]

Ventilators are going to be in critical shortage worldwide soon because of COVID19. Many people are working on jury-rigged solutions. A lot of those solutions work (most of the time!) but they have ...
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22 views

Looking for the library of the accelerometer MMA7361L or an equivalent in Proteus

I want to draw the transfer function of the accelerometer that I am using, which is the MMA7361L, using Proteus. Can you please help me to find it or to find an equivalent?
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34 views

MPU 6050 accelerometer generating gaussian noise with strange gaps

I was using an GY-521 accelerometer/gyroscope module in order to provide inertial tracking. The GY-521 interfaces with an Arduino which sends data over a serial connection. I convert these values into ...
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2answers
109 views

Is it possible to set up multiple wake up interrupts on STM32. ? How to manage multiple sensor reading intervals?

I am new to developing applications on STM32 development boards. Currently i have STM32 IoT discovery kit. I am able to configure all the sensors and read data. I am interested in low power design ...
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5answers
268 views

Considerations for transmitting the signal from a MEMS microphone over a short cable?

In my application I have the signals from 6 analog MEMS microphones (CUI Devices CMM-3729AT-42108-TR), each amplified by a pair of op-amps in a voltage follower -> inverting amp configuration. The ...
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1answer
107 views

How can I add (kHz to MHz) high voltage signal to a high voltage DC offset?

I am working with MEMS structures and need to move a device (switch) in a operating point with quite high offset. (150V DC offset and a voltage swing of 60V) To generate the high HF Voltage (up to ...
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33 views

Capacitance calculation of comb-drive actuator

I just want to make sure that I am performing this calculation correctly... From this COMSOL study, I gathered the following info... $$C_t = N\frac{\varepsilon_o\varepsilon_rl_ot}{d}$$ $$C_f = \...
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57 views

Question about a capacitance to voltage converter

I followed a MEMS course made basically of seminars. The examination is just the presentation of a scientific article. I've been given an article in which the Authors present a MEMS inclinometer ("...
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1answer
36 views

LSM303CTR 3-wire SPI and I2C - conceptual problem

I'm trying to interface LSM303CTR e-compass from ST-microelectronics with microcontroler. Due to design limitations I have to use 4-wire SPI. This MEMS device has option to switch beetween 3-wire ...
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2answers
90 views

MEMS Oscillator not running, why?

For the latest iteration of my prototype, I replaced a quartz oscillator with (what I thought would be) a drop-in MEMS replacement: the DSC6013CI2A-033.0000. It is suppling a 33 MHz clock to a TLC5955 ...
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2answers
981 views

Why are MEMS in QFN packages?

I've seen that many (if not all of them) MEMS, like accelerometers, they are only available in QFN packages. Why is that?
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2answers
58 views

How is Gyro drift error related to error in velocity and position?

While reading about IMU on wikipedia I found this about its disadvantages: "A constant error in attitude rate (gyro) results in a quadratic error in velocity and a cubic error growth in position." ...
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1answer
67 views

Frequency response of MEMS sensor in datasheet

I am looking for a MEMS acceleration sensor and the frequency range of 0 to 20 Hz is required. But after checking a lot of datasheets I am confused. Because in most datasheets I am unable to find any ...
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2answers
2k views

Why can I read accelerometer and gyroscope data on the LSM9DS1 with SPI, but not the magnetometer data on the same device?

I'm currently working on a device that uses the LSM9DS1, a 9-axis motion sensor by ST Microelectronics. I’m using a PIC24FJ128GB202 microcontroller by Microchip, and communicating with the sensor ...
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1answer
84 views

Invensense MPU9150 Accelerometer Raw Values Even

I've been working on pulling data from an MPU-9150 for a data filtering project, and I ran into a issue that I'm not sure of the cause. When I set the accelerometer to ±2g or ±4g range, all the raw ...
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1answer
53 views

Signal conditioning for 2SMPP-03 Pressure sensor

I am wanting to develop a circuit that accurately measures 15 Omron 2SMPP-03 sensors within its full range of -50KPA to 50KPA. Could someone give me a head start or refer me to some information on how ...
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2answers
87 views

LSM303C temperature sensor

I'm trying to read the temperature sensor from the LSM303C. I have enabled the sensor and can see the values move when the temperature is changed. But, the format of the sensor data is not provided by ...
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2answers
2k views

Why the prevelance of mechanical oscillators in electronic circuits?

The clock sources in modern electronics seem to come invariably from quartz and MEMS oscillators, both of which generate vibrations mechanically. The amplitude and frequency of the vibration are ...
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0answers
44 views

Sampling DC and AC components of capacitive sensor

I'm using a MEMS capacitive pressure sensor SCB10H. As I understand it, I can wire it up in one of two ways. Either I can measure the absolute capacitance using a chip like the TI FDC1004. In this ...
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1answer
2k views

Interrupt and FIFO settings in LSM6DS3

Requirement: Need to use only accelerometer in LSM6DS3 at 104 Hz in 2g full-scale mode and FIFO in Continuous mode. Interrupt should be generated every 320 msec. Understanding: For every 1 sec there ...
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1answer
48 views

How do we extract the etchant after it is stopped at the boron layer in MEMs fabrication process?

Dopant-Selective etch stop method is where we create a layer of highly doped boron in the substrate to stop the etching process at that exact layer, but when that cavity is created the etchants are ...
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2answers
140 views

Replacement of MEMS gyroscope with better less noise devices [closed]

Is there any good replacement for MEMS based 6 or 9 degree of freedom gyroscope to use with Arduino ? I read that most of MEMS are not reliable regarding the values, with slow reading and high noise ...
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83 views

How do we measure capacitance by change in vibration

A capacitively based MEMS affinity glucose sensor. link to the IEEE paper, from where I've got this doubt. The gold electrodes are separated with some distance and the permalloy is vibrating with ...
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1answer
86 views

Why does my smartphone level app require calibrating? [closed]

Doing some housework the other day I downloaded an app to my smartphone that included a level for measuring tilt. The app requires me to calibrate the level by first placing my phone on a perfectly ...
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1answer
91 views

How to find the actual measurement range of a temperature sensor, HTS221?

I am considering to buy the HTS221 Digital Temperature and Humidity Sensor by STMicroelectronics. The datasheet says the operating temperature of the sensor is from -40°C to 120°C. But on page 33 of ...
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4answers
3k views

Why are accelerometers (and other MEMS devices) so rarely integrated into components?

With the way things are headed, more and more functionality moves into a single chip each year. However, one thing that seems to remain completely untouched by this is MEMS devices like accelerometers ...
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0answers
91 views

How to improve AHRS algorithm

I'm currently working on a project with multiple IMUs mounted on moving vehicle estimating their pose. I've just read about AHRS algorithms. So I have two questions about them: Since my data is pre-...
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1answer
195 views

How can I keep stable position of my drone? How can I detect bias of them?

I am just a little bit worried about my research because I feel stuck in one point and I can't find the exit door. My question is about this: I will design a drone and the professor wants that ...
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1answer
109 views

Measuring High Speed Angular Velocity 20,000+ rps

I'm looking for a way of measuring angular velocity in a spinning object at high speeds - up to 25,000 degrees per second. There's ridiculously expensive gyros in the market that can do this, but I'm ...
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2answers
214 views

Dynamic Voltage controlled Capacitor

I need a sinusoidal varying capacitor to test a differential capacitance circuit. I will use the circuit to test MEMS gyroscope/accelerometer capacitance change. But right now I do not have the ...
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1answer
142 views

Is it possible to align a mems gyro to approximately true north with no external data input?

Is it possible to align a mems gyro to approximately true north with no external data input - ie nothing input by the user. I want to put a mems gyro/acc ship on a board and mount the board to a ...
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1answer
294 views

How to check if MEMS microphone is working?

I am using a MEMS microphone that I got from Digi Key ( Part Number: 1428-1021-1-ND). I soldered the mic on a PCB board using hot-air and then add an amplifier to increase the gain (Operational ...
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1answer
245 views

Is IMU sensitivity always equal to FS / resolution?

I'm in the process of evaluating MEMS IMUs for a new design. According to this post, if a Gyroscope's range is ±250°/s, and its resolution is 16-bit (0-65535), then sensitivity can be calculated as: \...
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3answers
842 views

Simulate Gyroscope through MEMS accelerometer

Is possible to simulate the Gyroscope using Accelerometer values? I would like to make that in Android Context so using MEMS smartphone accelerometer.
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1answer
157 views

How do I attach my MEMS device to a PCB? I do not have access to a die bonding machine

I want to connect the MEMS device electrically to a PCB through Au wire bonds. I have designed the PCB for the MEMS device to mount on. I would like to know if there is any way I can align and bond my ...
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2answers
2k views

Does MEMS accelerometer stability deteriorate over time?

I am wondering if over time MEMS accelerometer produces any worse output than when it is new? I found this research paper which acknowledges that temperature affect sensor output but there are no ...
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1answer
120 views

Compensating for MEMS Gyroscopic drift

I'm new to IMUs and know that they are prone to high drift, which depends on Temperature, White Noise and Time, but the most uncertain drift is caused by time, and under certain circumstances, drift ...
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2answers
2k views

Does multiple IMU increase accuracy

I'm just starting up with IMU's and I really want to work on my own flight controller, but a question always hits my mind and I am not able to find answer anywhere, so I'm here. Will multiple IMUs ...
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1answer
113 views

wrong voltage when splitting from 5V to 3.3V [duplicate]

I am trying to connect the MMA5452Q accelerometer to arduino on 5V (later it will be substituted with attiny85, hence the 5V voltage). It works just fine when i supply arduino's 3.3V. When i try the ...
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1answer
703 views

Angle Random Walk Noise - MEMS Gyro Error sources

I am working in a implementation of a Dead Reckoning approach in a simulator. In order to take values more realistics I am considering this MEMS gyroscope (SMI130). In this document is given this ...