Questions tagged [magnetometer]

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LSM9DS1 magnetometer fast ODR and Self-test modes

The datasheet of the LSM9DS1 says on the page 63: ...
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LSM9DS1 FIFO operation

The datasheet of the LSM9DS1 on pages 21-23 is very unclear on how actually the FIFO on the chip works. First of all, how many FIFOs does this chip have? From several places it looks like just one. In ...
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LSM9DS1 inactivity mode

The datasheet of the LSM9DS1 says on page 41: ...
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2 answers
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What does "full scale" mean in terms of a triple-axis magnetometer?

I'm writing a driver for a QMC5883L triple-axis magnetometer and in the datasheet it specifies "Full Scale" as a configurable parameter which can either be 2G or 8G. I've seen this on other ...
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Maintaining constant magnetic field strength with temperature

We use SmCo magnets to create a field strength of around 300mT. We choose this material, rather than NdFeB because the former has a much smaller change in field with temperature. For SmCo it is (...
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1 answer
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Magnetometer MMC5983MA X axis only works once

I'm working with a MEMSIC MMC5983MA magnetometer, using SPI. I can read the WHOAMI and status registers fine, and the Y and Z axes seem to be giving reasonable (near mid-range) results. But for ...
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80 views

Is magnetometer an IMU sensor?

I am just learning about orientation, hence I got confused with definition of the following: Inertial measurement unit (IMU). Magnetic and inertial measurement unit (MIMU). Attitude and Heading ...
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Fluxgate magnetometer design for a non-electrical engineer

I am working on a project where I have made a fluxgate sensor. The sensor consists of a drive winding and a sense winding. I have a function generator going into an amplifier (to drive the core to ...
2 votes
1 answer
95 views

Magnetometers : on motor controler PCB or near motors?

For the cave robot I'm working on, it would be nice to have a magnetometer to get a (rough) orientation of the robot. By rough, I mean that 10° is more than enough, and even a +-45° error is still ...
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Why do magnetometer values change when I move PCB?

I have an MPU9250 on my PCB and I use an AHRS system with a Madgwick filter to get yaw angle. But for some reason - I can't get normal Euler angles (SO question). But I guess, I understood why. When I ...
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Is there a way to know which magnet pole is facing the circuit?

I am not that much into magnetism, but I am facing the problem of defining the pole of the closest outer magnet it faces the circuit with. The magnet is completely out of control and might as well ...
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1 answer
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Sensor fusion in a metal heavy environment

I am trying to get heading information of a forklift. I've designed a small PCB for this purpose. This PCB has a 3 axis magnetometer and a 6 axis gyroscope-accelerometer (Z- axis looking towards the ...
2 votes
3 answers
920 views

I2C pull-up resistors and voltage

I have a sensor that I'm trying to read via I2C, but I have some issues with the pull-up resistors and what voltage they would be set to. My host computer is the Arduino Nano Every while my sensor is ...
2 votes
0 answers
59 views

Magnetometer readings in metal heavy environment

We have designed a sensor board that consist a magnetometer, an accelerometer and a barometer which we are planning to use this on a forklift to get heading information of the vehicle. I have used ...
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1 answer
73 views

Why are IMU sensors calibrated in the ways that they are?

I'm using a BNO055 IMU for a project, and I'm learning to calibrate each sensor separately. The gyroscope is calibrated by standing the device still in any position The magnetometer is calibrated ...
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Absolute angle or position measurement for slow movements

I would like to monitor the movement of an extremely slow object. The x,y,z-position is not really relevant to me, I am more interested in the angle. I have come across the MPU6050 that is explained ...
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Is my magnetometer calibrated correctly?

I am calibrating the AK8963 on the MPU9250. The first plot shows original mag readings and the last plot shows readings corrected for soft and hard bias. I am following the guidance of Kris Winer: ...
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Wierd LSM303DLHC magnetometer output

I'm kind of new to electronic and recently bought a Adafruit 9DOF Sensor. I use it with a Raspberry Pi Zero connected through I²C and when I try to read the Z-axis magnetic field data of the ...
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4 votes
1 answer
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Mystery SOT-143 Part on Magnetometer

I'm trying to understand the operation of a single coil magnetometer (marketed as "fluxgate", but with only a single coil). I've backed out the schematic as shown. The coil is driven by a ...
2 votes
2 answers
229 views

Angle between North and East from magnetometer values

I have a magnetometer from where I get X, Y and Z which point to the direction of the detectable magnetic fields. I'm using these values to get the angle between X and Y using atan2. I am a bit ...
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1 answer
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The purpose of a 10 uF cap for the MMC5883MA magnetic sensor

Datasheet: https://eu.mouser.com/datasheet/2/821/MMC5883MA-RevC-1219541.pdf Here is their answer and my question: Hello, May I know whether or not I can do away without the 10 uF set/reset coil's ...
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2 votes
1 answer
476 views

Tilt compensation for yaw calculation from magnetometer and accelerometer

I am working on a project where I have to calculate the roll, pitch, and yaw angles using an accelerometer and a magnetometer. I calculate the pitch and roll angles using the accelerometer and I am ...
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2 answers
338 views

Unexpected YAW angle from magnetometer

I have some doubts about a magnetometer application. I am trying to get YAW angle value from magnetometer data and so I am doing the following: ...
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ICM-20948 with DMP can't find its own compass

I am interfacing to the Invensense ICM-20948 9-DOF IMU chip using an ESP8266, and a 1.8V level shifter & regulator, which works fine. I am trying to get quaternions from the internal DMP using ...
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Detection of object movement & rotation in magnetic field

I need to develop solution for monitoring movement & rotation of components in 3D space (integrated logistical and production workspace). Components have a size of circa 0.5 x 0.25 x 0.25 meters. ...
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How to find which landline wires are mine using sensors on my cell phone?

How do I figure out which one is my line? I know there's a special tool for it, some sort of beeping proximity sensor. I don't want to buy any tools. My cell phone, like many, has a Magnetometer. ...
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3 answers
385 views

Arduino frequency measurement to 2 or 3 decimal places

I am in the process of building a Proton Precession Magnetometer to calculate the earths magnetic field strength by measuring the precession frequency of protons in distilled water. I am using an ...
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1 answer
47 views

How to calibrate any magnetometer when sensor is changing the location?

I found magnetometer calibration is done for soft/hard distortions also for tilt compensation using gyro data as well, but all of them perform for know step of the procedure (rotating aligned with ...
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3 answers
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Reed switch sensitivity/Strong magnets for 6 ft detection

Can I detect magnetic field from 6 feet distance using Reed switch ? Do I require very strong magnet for it ? I can have low AT Reed switch for more sensitivity but detecting distance of 6 feet should ...
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58 views

What are the general guidelines to configure IMU sensor parameters?

Im working on developing a Attitude and heading reference system (AHRS) for my quadcopter project. Im working with AltIMU-10 v5, it is 10 DOF (gyroscope,Accelerometer,Compass,Altimeter) IMU board. ...
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1 answer
173 views

Detecting rotation from a fixed sensor

I am looking for a way how to detect the rotation of an object that is hanging from ceiling, attached with a rope. Since the object can freely rotate for many revolutions (until the rope is too ...
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1 answer
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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 ...
2 votes
2 answers
217 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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1 vote
1 answer
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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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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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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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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). ...
2 votes
1 answer
113 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 ...
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1 answer
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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 ...
3 votes
2 answers
2k 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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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.
1 vote
2 answers
456 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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1 answer
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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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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 ...
1 vote
1 answer
44 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 ...
1 vote
1 answer
334 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 ...
2 votes
1 answer
395 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 ...
-2 votes
1 answer
191 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 ...
13 votes
7 answers
5k 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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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 ...