Questions tagged [magnetometer]
The magnetometer tag has no usage guidance.
57
questions
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Magnetometer Offset Drift
I am using a magnetometer to detect metal objects. I typically take a reading when the software starts (zero offset calibration) and assuming that there are no metal objects in the vicinity and then ...
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2answers
63 views
Use magnetic field to estimate distance - best sensor type
I want to measure the position of something that movies along a single axis over a range of 150mm at a frequency of roughly 1kHz. You can imagine that it is the piston on a shock absorber. I could ...
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1answer
44 views
Position from magnetometer?
So basically I'm trying to figure out the distance that a person's hand is from maybe a point on the center of their chest and their bicep. I'm trying to get the position they are moving in as they ...
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1answer
30 views
Magnetometer moving along a line with different measurement?
I am testing on a magnetometer and found that moving the magnetometer along a straight line within the range around 1m, and the measurement varies. From what I understand, moving magnetometer along a ...
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0answers
50 views
Capacitor GND to GND on Magnetic Sensor
What is the purpose of this capacitor placement ?
Why is it placed like that near Magnetic Sensor ?
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0answers
87 views
Quarternion disagreement between two BNO80 IMU
I'm trying to use two BNO80 orientation sensors to measure the deflection of a universal joint in both pitch and yaw (there are components in the way that prevent the use of rotary position sensors). ...
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1answer
75 views
Magnetic Field around step-down converters [closed]
I'm courious how strong is magnetic field around step-down conveter? My plan is to use one LM2596 @ 12V(1A at maximum load) and one LM2596 @ 5V for STM32.
I Know that coils generate MF around itself ...
2
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1answer
60 views
Are magnetic sensors able to pick up the electromagnetic field inside toroids?
From my understanding, correct me if I'm wrong, the electromagnetic field outside a toroid is 0, but it has a EM field within the shell itself. So my question is can a magnetic sensor pick up on this ...
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2answers
940 views
Magnetometer thermal drift
I try to measure Earth's magnet field with LIS3MDL. This chip is operable in (-40..+85) deg. When the temperature is lower than -10 deg, the chip measures becomes wrong. The plot of raw measures after ...
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1answer
346 views
When to use a Hall probe and when a fluxgate magnetometer to measure magnetic fields?
I am familiar with how the two methods work, but what applications are more suitable for one rather than the other?
I have seen this question but I don't think it covers my point.
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2answers
346 views
LIS3MDL runs non-stable
This chip cannot run the Hall sensors on each power on. The chip can operate with microcontroller each time, the register 'who-am-i' returns 0x3d, configuration ...
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1answer
67 views
Can you pair a compass or magnetometer with an induction circuit to create a form of metal detector?
A compass or magnetometer by themselves can only detect/measure magnetic fields, and thus would normally only be able to detect ferrous metals and (possibly) some active electrical circuits in ...
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3answers
150 views
Radiation Effects on Electronics
I'm developing a magnetic field sensing kit for a project. The kit contains sensors (specifically an accelerometer, a gyroscope, and a magnetometer) that will detect and measure magnetic fields, and ...
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1answer
41 views
How to sense the two magnet attracting each other
I have a cube that has four side sticked with magnet sheet and I have other boxes like this and I want to know how could I sense each time a cube is connected to to another and other and other
I have ...
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1answer
234 views
Reading from Analog Magnetometer with Raspberry Pi
I'm trying to read an analog magnetometer using the Raspberry Pi Zero. I never worked with the Pi directly before; it was always through an Arduino hooked up to the Raspberry Pi. However, through ...
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1answer
323 views
Realistic Magnetometer Specifications [closed]
I'm working on making improvements to an old project I helped design. The project used an Arduino to take measurements from six sensors to measure the strength of a nearby electromagnet that generated ...
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1answer
98 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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7answers
4k views
Acceleration when device is on tilt
I'm currently working on device that uses always-on 3D accelerometer(using scale +-2g) and 3D gyroscope(using scale +-250g) -sensor.
I can read every possible vector (X,Y,Z) and their acceleration (g'...
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1answer
139 views
hilti PX 10 TRANSPOINTER working principle
Sorry to ask this here. But I really got wondered what is this product's working principle. Anybody share what would be the core idea behind this product PX 10 TRANSPOINTER from hilti.
Click here to ...
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2answers
99 views
UAV-towed gradiometer: magnetic signal decay with water depth
I want to use an unmanned aerial vehicle to tow an airborne gradiometer. Goal is to detect historic anchors buried in the sea floor. What is the effect of (sea)water depth on the magnetic signal? Any ...
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1answer
203 views
STM32F4 LIS3MDL Magnetometer Hard-Iron Effect Elimination
I am using LIS3MDL 3 axis magnetometer sensor for car detection project. while I am using raw data, I understand that if sensor is exposed to hard-iron effect then this sensor can not read old values.
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1answer
156 views
LIS3MDL sensor Vehicle Detection range
I want to use LIS3MDL magnetoresistive sensor for Parking Vehicle Detection project. I compared this with HMC5883L. LIS3MDL 's Full Scale range is +16 Gauss but HMC5883L 8 Gauss.
But I did not ...
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0answers
217 views
unstable magnetometer readings
I did the magnetic calibration here on the LSM303DLHC for a field roughly 48 uT. The method seems to have worked in that the combined bias (b) values went from ...
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2answers
58 views
How do I track the strength of a magnetic field to 1:20,000?
I need to track the change in field strength of a (nominally) 1 Tesla Samarium-Cobalt magnet as a function of temperature. It is specified to be less than 50ppm/degC.
Is there any simple technology ...
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2answers
902 views
Magnetometer (LIS3MDL) temperature reading changes with orientation
I have a LIS3MDL outputting what seem to be reasonable magnetic field strength values (see second image). However, I am confused why the temperature reading seems to be dependent on the orientation ...
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4answers
227 views
Can a “static” magnetic field carry Information? [closed]
Information is electronically represented as some energy that is changing, therefore we measure an on state (1) and an off state (0), to create a (0,1) binary representation of the information.
Now a ...
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1answer
269 views
How often should the CMPS11 be calibrated?
I have a project with arduino and the magnetometer CMPS11. I wanted to know how often the CMPS11 should be calibrated using this procedure: https://www.robot-electronics.co.uk/htm/cmps11i2c.htm
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4answers
291 views
Which is give better result for find angular position of device using 9-axis IMU snesor.?
I'm Using LSM9DSO 9 axis Sensor Which gives output of Accelerometer , gyroscope , Magnetometer Output data. i want to find the angular position of the device using this sensor.
currently i'm trying ...
2
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1answer
88 views
Recording heading with magnetometer that is inside spinning object
I'm wondering if it is possible to record the heading of an object (call it a ball) that has a 3 axis magnetometer in it? obviously if the ball was still it would be simple, but as the ball is ...
3
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1answer
936 views
Calibration of magnetometer for precise yaw
I'm using Sparkfun Razor IMU 9DOF sensor which incorporates accelerometer, gyroscope, and magnetometer, for giving the Euler's angles (yaw, pitch, and roll). I'm using the firmware at this link. It ...
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4answers
2k views
How is the degaussing feature in the HMC5883L 3-Axis Digital Compass chip correctly used?
edit/tl;dr: The set/reset strap driver is an H-bridge circuit to deliver 10 mA of DC current to a strap which temporarily produces about a 1.1 gauss magnetic field offset. A change in the measurement ...
6
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2answers
1k views
Why do compass chips in cellphones require frequent calibration?
Most cell phones offer digital compass functionality which uses a 3-axis magnetometer chip for data. Phones (some more than others?) frequently require the user to "recalibrate", which involves ...
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1answer
195 views
What is the difference between IMUs and other devices that have accelerometers and gyroscopes (smartphones, tablets, sensewear etc.)?
The general definition of IMU says that any device that has accelerometer, gyroscope and magnetometer/GPS packed together is an IMU. Then why aren't other devices that have the same sensors called ...
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2answers
196 views
TWI/I2C Protocol with HMC5883L Magnetometer with ATMEGA256RFR2 XPLAINED PRO (megaavr)
Im trying to read Data Output Registers of X,Y,Z
So far I've been able to:
...
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2answers
767 views
Bosch BNO055 gyroscope bias stability
What is the bias stability in degrees/hour of the gyroscope on the BNO055? The datasheet lists some specs of the gyro on page #14 but I cant find the bias there. There is an item called "output noise"...
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1answer
181 views
accuracy of magnetic field sensors in electrical vehicles
For coordinate system alignment purposes, as demonstrated in the figure, I want to use the smartphone's virtual orientation sensor. However, the virtual sensor is using a combination of acceleration, ...
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1answer
189 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 ...
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1answer
9k views
Accessing magnetometer results in MPU-9250
I am interfacing an MPU-9250 to an STM8S207 microcontroller.
The MPU-9250 is accessed via 400kHz I2C. I have no isses with getting measurement data from the temperature, gyro and accelerometer, but ...
0
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1answer
385 views
Is LSM303dlhc INT1 active HI and DRDY active LO?
I just want to make sure I am approaching my LSM303DLHC design properly, and
that I'm correct in the active state of the two pins.
I setup the following registers as indicated:
...
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2answers
4k views
Why also using magnetometers in IMUs?
Why do we also use magnetometers when building IMUs, that is why don't we simply and only use gyroscopes and accelerometers?
I also would like to know how does a magnetometer work as a 3-axis device? ...
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1answer
811 views
Bricked IMU using a magnet?
I think I may have bricked my IMU or seriously damaged it earlier this week. I have the Adafruit 9-DOF IMU Breakout - L3GD20H + LSM303 (link: http://www.adafruit.com/products/1714) which has an ...
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2answers
991 views
LSM303DLHC outputs frozen
I've was trying all afternoon yesterday to get some data out of my LSM303DLHC using an STM32L152 Nucleo board.
Finally I got all the I2C stuff down, managed to set some registers, verify their ...
2
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1answer
771 views
What can cause magnetometer offset to be variable?
I'm a using a embedded MEMS 3-axis magnetometer. With 'embedded' I mean that I am using an Android device with a magnetometer. I am not doing the low-level control myself, only retrieving measurements....
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0answers
125 views
Magnetometer perpendicular to ground plane
A team and I are building some wearable tech that needs a magnetometer to know your heading. Unfortunately, we have to mount it "vertically" - imagine that the board is flat against your stomach/waist....
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1answer
576 views
Error in Magnetometer Readings
I have a magnetometer which I am using for orientation purposes. What i would like to know is how to calculate the total error when finding the magnitude of the magnetic field vector. So I know each ...
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1answer
136 views
3 axis magnetometer issue in one axis
I have several 3-axis magnetometers mounted on breadboards, and they all read correctly in the x and z directions.
The Y direction is very strange; when turned to read ...
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2answers
324 views
How build coil for respiratory magnetometer or find a better option (hall effect)?
I am trying to build an respiratory magnetometer. This device is no longer widely used even thought it was well liked. The reason it is no longer used is due to the fact that the coils used in it were ...
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1answer
251 views
Would proximity to water affect a magnetometer
I'm using an InvenSense MPU9150 as a tilt-compensated compass in an autonomous sailboat. I'm trying to decide where to put the the control board, with options being in a dry box on top of the "deck," ...
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4answers
11k views
How to connect multiple of the same device to an Arduino using I2C?
I want to use two of the same magnetometer (HMC5883L) with my Arduino, but I cannot figure the code for calling each of them separately.
I have read online that connecting multiple devices is ...
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1answer
2k views
What are the limitations of IMU sensor devices?
The Oculus Rift DK2 virtual reality headset uses an IR camera in conjunction with built-in accelerometer/gyro/magnetometer for accurate head/motion tracking. The previous version (DK1) used only an ...
