Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [mems]

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

0
votes
1answer
26 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 ...
0
votes
0answers
18 views

STM32F429ZI MEMES sensor interfacing

I need help using L3GD20 gyroscope that comes with stm32f429ZI DISC1 board. I have used code in this thread as the example and this video to generate code using cube MX This is the code. IDE : KEIL ...
0
votes
0answers
61 views

Custom microphone amplifier poor high frequency response

I've designed and received a custom MEMS microphone amplifier PCB, but am having issues with poor high frequency response and very low sensitivity/gain. Basically the microphone stops picking up ...
1
vote
0answers
45 views

How do I start calculating a MEMS productions costs

I have a MEMS design and I've understood that producing a prototype in a fab will cost around 500K Euro. I am trying to estimate the cost of making 1 wafer in production but I'm not sure what to look ...
0
votes
0answers
38 views

How to simulate a piezoresistive pressure sensing MEMs layout without COMSOL?

I have a masks layout of a Piezoresistive MEMs pressure device that I've designed in LEdit(Tanner Tools Eda). The device consists of 4 piezoresistors bonded onto a thin diaphragm which deforms ...
1
vote
2answers
50 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 ...
16
votes
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 ...
1
vote
0answers
34 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 ...
0
votes
1answer
35 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 ...
0
votes
2answers
70 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 ...
0
votes
2answers
57 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 ...
-1
votes
1answer
80 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 ...
0
votes
1answer
41 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 ...
0
votes
1answer
232 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 ...
9
votes
4answers
2k 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 ...
1
vote
0answers
83 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-...
0
votes
1answer
458 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 ...
0
votes
1answer
970 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 ...
0
votes
1answer
170 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 ...
-2
votes
1answer
85 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 ...
0
votes
2answers
161 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 ...
1
vote
1answer
122 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 ...
2
votes
1answer
214 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 ...
2
votes
1answer
190 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: \...
1
vote
1answer
107 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 ...
0
votes
1answer
109 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 ...
1
vote
2answers
1k 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 ...
0
votes
1answer
98 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 ...
2
votes
1answer
507 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 ...
3
votes
2answers
120 views

Why do accelerometers have holes etched in their masses?

I have been studying MEMS for a while now and I noticed that in almost every accelerometer design there are holes etched in the mass that is attached to the hinge. Why is that? A thing I thought of ...
0
votes
1answer
60 views

Heat generation rate to temperature

I have heatgeneration rate in W/m3 and I wanted to know how much temperature it can generate. The heatgeneration element is Platinum resistor for MEMS project. I want to know numerical relation? ...
1
vote
1answer
59 views

Is the frequency accuracy of this MAX7373 oscillator within tolerance?

I'm currently using a Maximum Integrated MAX7375 MEMS 8MHz oscillator (http://www.digikey.ca/product-detail/en/maxim-integrated/MAX7375AXR805-T/MAX7375AXR805-TCT-ND/4967873) as a clock source for a ...
0
votes
1answer
113 views

Is it a bad idea to switch from using a quartz oscillator for my timing circuit to using a MEMS oscillator? [closed]

I've read MEMS oscillators offer improved performance including phase jitter less than 500fs and frequency stability down to +-0.1ppm. It's difficult to switch from quartz because it simply works and ...
1
vote
1answer
986 views

how to solder MEMS microphone to PCB at home? [closed]

I would like to experiment with audio applications using MEMS microphone. The problem is i cannot think of a way to solder these microphones on a pcb as PCB prototype manufacturers that i know won't ...
0
votes
1answer
69 views

MEMS measurements of relative motion [closed]

I haven't performed any tests, but if I am in a train with velocity != 0, what will measure my IMU? (With IMU I suppose to have acc + gyr + magn). I am in a relative motion system, and my MEMS will ...
1
vote
1answer
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 ...
0
votes
1answer
155 views

MEMS 6 axis: acc + mag or acc + gyro?

I have a question which I can not give an answer even if it is some days I am thinking about that. In general a INS is made by an accelerometer + a gyroscope. Is it possible to obtain the same ...
0
votes
2answers
346 views

MEMS: why INS + GPS? [closed]

I have read in the Internet that in the most cases people prefer using INS (accelerometer + gyroscope) + GPS sensors. I have read they can compensate each other errors, but is it possible to obtain ...
1
vote
3answers
1k views

Is it possible to directly interface a MEMS ADMP541 microphone over I2S with any Microcontroller?

I have bought a MEMS ADMP541 Evalution kit to record voice samples with arduino controller MEMS microphone will produce digital o/p , I2S communication protocal My question is should I directly ...
0
votes
3answers
794 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.
1
vote
2answers
678 views

Signs of overheated smd chip

I am developing a board that has a couple of small SMD chips. I have successfully made a couple of working boards. Unfortunately I found out that one of the chips in my original design is going to be ...
-1
votes
1answer
515 views

I2S output to a sound card

I followed this tutorial on building a microphone with two MEMS mics and a cheap USB sound card - it works pretty well, although I'm looking to upgrade the MEMS mics to some with better SNR and ...
0
votes
1answer
1k views

Accelerometer X/Y/Z “high events”

I'm looking at this accelerometer LIS3DH and the datasheet says that it could enable interrupt generation on X/Y/Z "high" or "low" events. What do these events actually mean? When are "high events" ...
1
vote
3answers
438 views

What is the general range of the structure oscillation frequency in MEMS gyroscopes and/or accelerometers?

Is there a general range for the oscillation of the internal structure in common MEMS gyroscopes and accelerometers? I'm considering the possibility of damaging MEMS sensors via externally introduced ...
2
votes
2answers
145 views

Is it possible a microphone sounds different when user hold it(or not)?

I am a computer-science student working on a signal processing project on smartphones based on recorded microphone signals. For my project, I need a really "reliable" recorded signal. The system works ...
1
vote
1answer
451 views

Calculating bits/sample from a digital MEMS microphone

I'm thinking of using a digital MEMS microphone in a project - looks like it would save on some parts: no need for an amplifier and ADC. The output from the microphone is PDM and I'd need to convert ...
0
votes
1answer
78 views

Avoiding heavy controller boards in a MEMS sensor circuit

I am very new to the circuit designing and the "Internet of things" world. I am trying to put together, for simulation purposes, a system that can pull information from a mems accelerometer sensor and ...
3
votes
1answer
976 views

How is an accelerometer initially calibrated?

Referring to a MEMS accelerometer, how is the laboratory, initial calibration being carried out? Is the gravitational acceleration involved as a reference, or is the actual analog data being ...
13
votes
1answer
2k views

1000 Hz+ refresh rate displays/ projectors? (for making volumetric displays)

I have found only few volumetric displays for the kind of effect I'm looking for. They can be divided by two characteristics into two separate groups each: rotating or moving screens, and moving ...
0
votes
1answer
948 views

Sustaining amp circuit for MEMS oscillator

A MEMS oscillator can be modelled as a lumped mass-spring-damper with a high resonant frequency and Q factor. According to Wikipedia "All commercial MEMS oscillators use electrostatic transduction". ...