sensors | Reactive mobile device sensors plugin for iOS Android | iOS library
kandi X-RAY | sensors Summary
kandi X-RAY | sensors Summary
Reactive mobile device sensors plugin for iOS, Android, & UWP. Support sensors - accelerometer, ambient light, barometer, compass, gyroscope, magnetometer, pedometer, and proximity
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of sensors
sensors Key Features
sensors Examples and Code Snippets
// discover some devices
CrossSensors.Accelerometer
CrossSensors.Gyroscope
CrossSensors.Magnetometer.WhenReadingTaken().Subscribe(reading => {});
NSMotionUsageDescription
Using some motion
Community Discussions
Trending Discussions on sensors
QUESTION
TL;DR how can I have an Android sensor permanently running/active/registered for my app, even if I close it?
Objective:
I'm making a Flutter application that counts your steps using the pedometer package,
which uses the built-in sensor TYPE_STEP_COUNTER
of Android,
which returns the # of steps taken since last boot (iOS). On Android, any steps taken before installing the app are not counted.
How I implemented it:
- When the app is actively running in the foreground, each step causes
a
myStepCount
to increment by 1. - In all other cases (phone locked, went to home-screen, closed the app...), the android
TYPE_STEP_COUNTER
sensor should still be running in the background, and once I open my app again, the difference between newstepCount
and last savedstepCount
(saved using shared_prefs) will be calculated and added tomyStepCount
.
Important:
The TYPE_STEP_COUNTER
sensor must be permanently running/stay registered in the background, even after I lock my phone, go to the home-screen, or close the app...
Observations:
- On my Samsung Galaxy A02s, my app works perfectly fine, as it it supposed to
(as described above). That is because on that phone I also have the
Google Fit app installed, which tracks your steps 24/7 (so the
TYPE_STEP_COUNTER
sensor is permanently registered). - On my Samsung Galaxy S7, my app does not work as it's supposed to.
myStepCount
gets incremented when I take steps while the app is running in the foreground. But steps taken while the app is closed will NOT be added tomyStepCount
once I open the app again.
Note: I don't have any other step-counting-apps like Google Fit on this phone.
Conclusion:
I need to find a way to register the TYPE_STEP_COUNTER
sensor from my Flutter app, and keep it registered even after I close the app.
2 Attempted (but unsuccessful) Solutions:
1st Attempt:
Calling Native Android Code from my Flutter Code to register the sensor
This is my main.dart
file (with the unimportant parts left out for simplicity):
ANSWER
Answered 2022-Feb-09 at 22:13Update: I've contacted one of the developers of the pedometer package, and he suggested me to use flutter_foreground_service (which is developed by the same team/company as pedometer). It works.
But I would still find it interesting, if there is another way (maybe similar to my 2 failed attempts).
QUESTION
Let me introduce the following three classes: AbstractProcessor and these two child classes. The code below is not complex because there are only two child classes, but what if procedures1
and procedure2
both has many N
candidate implementation? In such case, there are NxN
child classes and a lot of duplication will be made by hand-coding. In the code below for example, each procedure can either be fast one or accurate one. So there are 2x2 possible child classes.
I would ask about technique/design pattern to reduce duplication. More precisely, is there any technique to reduce that NxN
hand-coding to 2N
hand-coding?
Noting that procedure1
and procedure2
both have to share the same var_
(in my case it is measurement value of physical world of robot) and the common function foo()
, procedure1
and procudure2
can hardly be composed by a has-a relationship. Actually in my application, there are lot of var_
because the robot access to many type of sensors.
ANSWER
Answered 2022-Feb-09 at 08:09Inheritance is not the solution to everything. Sometimes all the problems are gone once you don't use inheritance. There are many different ways to do what you want. One is to store the callables as members:
QUESTION
Description:
I am playing around with Observable Plot an really like how easy it is to set up simple plots.
Now I have a little "more advanced" chart that I want to plot and need help.
In my data, I have multiple temp
(temperature) readings recorded at a certain timestamp
.
Each reading comes from a sensor
, and each sensor
is attached to a certain device
(multiple sensors (e.g., 1-3) can be attached to a single device (e.g., 2)).
Thus, one data point might look like the following (see bottom script for a full minimal workabel example):
ANSWER
Answered 2022-Feb-07 at 11:29I think what you want is
QUESTION
I am following the code on this page:
https://docs.microsoft.com/en-us/windows/uwp/devices-sensors/gatt-client
It shows simply scanning for devices and then calling FromIdAsync to get the device, but as soon as I call that method I get an exception from the bluetooth dll saying "Access is Denied".
I then found another post when I did a search for FromIdAsync and Access is Denied and it included this code:
...ANSWER
Answered 2022-Jan-27 at 15:53It looks like the issue has something to do with Unity not including the bluetooth capability when building directly from Unity and running.
When I built the project and then loaded it into Visual Studio and executed it there, I did not get any errors.
So that will be my plan....build and then open in Visual Studio.
QUESTION
I have the following problem. I would like to remove the noise from an IMU sensor. My clue would be a Kalman filter. In the Arduino IDE you could easily implement one via library. Now I would like to solve this by C# directly on the computer but I can't find a library on .NET 4 that works. I tried it with NugetPackages : MathNet. and Emgu.CV. Do you have alternatives that work on .NET 4.0 or do they even work, and if they do, does anyone have a good example? Have a nice day :)
EDIT: Adding Arduino IDE code
...ANSWER
Answered 2022-Jan-09 at 19:43It's not so very obvious on how to use these libraries (but that's complex math, so this is actually expected...)
You can print the contents of a matrix like so:
QUESTION
I am new to Plotly Dash. I created some Dashboard in Tableau, in Tableau I have a dashboard with a map and a line chart next to it where I can select locations on the map and the line chart shows me the time series line chart from that sensor. I try to do this in Dash and learn some new tools like Dash since I often used Plotly with its beautiful graphs.
I have internal data on a database with some complex logic where I have the locations on a seperate file, since I want to have as less data as possible I don’t want to include lat und lon in the SQL View. For this question I use data available on the web.
I have sensor measuremt data like no2, no, o3 and more from sensors at different locations. My goal ist to have a map with the locations of the sensors. When I click on a location it should show me the line chart and I want to be able to select as many locations as I want so that I can compare the line charts.
Is this possible? I have the line chart, but I can’t connect the part with the map to work. I will use this as a foundation to include many more graphs like bar charts and so on. The top selector will be a dropdown to select the parameter like no2, pm25. Many thanks in advance.
This is the line chart so far:
...ANSWER
Answered 2021-Dec-27 at 07:15If you are not bound to use a Graph
component for the map, the Map
component from dash-leaflet
supports click events natively. Here is a small example, where map clicks are used to update a graph,
QUESTION
I'm trying to write my first PowerShell script and I'm struggling to get my head around the object orientation and piping approach. So I've got a directory structure like this (Google Takeout Nest directories):
...ANSWER
Answered 2021-Dec-08 at 23:52Before posting the code, I think it's worth mentioning, this should work as long as all CSVs have always the same headers / columns. If this was not the case something like this could happen:
QUESTION
In Flutter, there is the sensor package https://pub.dev/packages/sensors that allow to know the velocity X, Y and Z.
My question is : how could I calculate the distance of a phone thrown in height ?
Example : you throw your telephone, with your hand at 0.5 meter from the ground. The phone reaching 1 meter from your hand (so 1.5 meter from the ground).
How can I get the 1 meter value ?
Thanks all !
Here is the code I have right now (you need to install sensors package):
...ANSWER
Answered 2021-Nov-30 at 18:54Correct me if I'm wrong, but if you're trying to calculate a phone's absolute position in space at any moment in time directly from (past and present) accelerometer data, that is actually very complex, mainly because the phone's accelerometer's frame of reference in terms of x, y, and z is the phone itself... and phones are not in a fixed orientation, especially when being thrown around, and besides... it will have zero acceleration while in the air, anyway.
It's sort of like being blindfolded and being taken on a space journey in a pod with rockets that fire in different directions randomly, and being expected to know where you are at the end. That would be technically possible if you knew where you were when you started, and you had the ability to track every acceleration vector you felt along the way... and integrate this with gyroscope data as well... converting all this into a single path.
But, luckily, we can still get the height thrown from the accelerometer indirectly, along with some other measurements.
This solution assumes that:
- The sensors package provides acceleration values, NOT velocity values (even though it claims to provide velocity, strangely), because accelerometers themselves provide acceleration.
- Total acceleration is equal to sqrt(x^2 + y^2 + z^2) regardless of phone orientation.
- The accelerometer will read zero (or gravity only) during the throw
- This article in wired is correct in that Height = (Gravity * Time^2) / 8
The way my code works is:
- You (user) hold the "GO" button down.
- When you throw the phone up, naturally you let go of the button, which starts the timer, and the phone starts listening to accelerometer events.
- We assume that the total acceleration of the phone in the air is zero (or gravity only, depending on chosen accelerometer data type)... so we're not actually trying to calculate distance directly from the accelerometer data:
- Instead, we are using the accelerometer ONLY to detect when you have caught the phone... by detecting a sudden change in acceleration using a threshold.
- When this threshold is met, the timer is stopped.
- Now we have a total time value for the throw from beginning to end and can calculate the height.
Side notes:
- I'm using AccelerometerEvent (includes gravity), not UserAccelerometer event (does not include gravity), because I was getting weird numbers on my test device (non-zero at rest) using UserAccelerometerEvent.
- It helps to catch the phone gently ***
- My math could be complete off... I haven't had anyone else look at this yet... but at least this answer gets you started on a basic theory that works.
- My phone landed in dog poo so I hope you accept this answer.
Limitations on Accuracy:
- The height at which you let go, and catch are naturally going to be inconsistent.
- The threshold is experimental.... test different values yourself. I've settled on 10.
- There is probably some delay between the GO button depress and the timer beginning.
- *** The threshold may not always be detected accurately, or at all if the deceleration ends too quickly because the frequency of accelerometer updates provided by the sensors package is quite low. Maybe there is a way to get updates at a higher frequency with a different package.
- There is always the chance that the GO button could be depressed too early (while the phone is still in your hand) and so the acceleration will be non zero at that time, and perhaps enough to trigger the threshold.
- Probably other things not yet considered.
Code:
QUESTION
I am working currently on a project and I need to send a POST request to spring. I looked or several hours already for a solution and didn't find one to work. The request worked when I developed that part. The problem is that after creating some new functionalities(2 new endpoint in another controller) the POST requests for creating or updating the entities stopped working without changing code in the specific area.
The Controller:
...ANSWER
Answered 2021-Nov-29 at 12:51It seems that you have multiple @JsonBackReference
and @JsonManagedReference
in your application and as a consequence, you must provide a name for all pairs as follows:
QUESTION
I'm trying to include the codecoverage from my Python project.
First I executed the command py.test --cov=tests/ --cov-report xml:cov/coverage.xml
to run the tests and report to cov/coverage.xml
My sonar-project.properties file:
...ANSWER
Answered 2021-Nov-17 at 10:07As of today, coverage.py doesn't support Sonarqube: https://github.com/nedbat/coveragepy/issues/1033
Can you try the experiment mentioned on that issue, and report there about what happened? Maybe there's an easy adjustment to make here.
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