Questions tagged [magnetometer]

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27 views

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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48 views

Magnetometer hard iron / soft iron calibration-compensation

I have real magnetometer data captured by BMX055. I deployed an hard-soft iron calibration code (magcal) on this data in Matlab. Here is the code: ...
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1answer
81 views

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 ...
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2answers
80 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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1answer
59 views

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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1answer
65 views

Tilt compensation for yaw calculation from magnetometer and accelerometer

I am working on a project where i have to calculate the raw, pitch and yaw angle using an accelerometer and a magnetometer. I calculate the pitch and roll angle through the accelerometer and I am ...
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2answers
49 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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0answers
113 views

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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1answer
16 views

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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1answer
81 views

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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3answers
134 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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1answer
23 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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3answers
46 views

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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0answers
43 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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1answer
77 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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1answer
28 views

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
104 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
49 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
67 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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103 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). ...
2
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1answer
88 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
62 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
1k 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
470 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
381 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
74 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
166 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 ...
2
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1answer
259 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
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1answer
352 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
123 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
156 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
100 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
214 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
177 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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240 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
59 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
1k 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
242 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
286 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
338 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
92 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
1k 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 ...
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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
228 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
211 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
899 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"...