# Real-time sensor app

I want to measure the rotations of a magnet near a 3-axis magnetometer and do some simple processing to it. THIS IS A PURELY FUNCTIONAL SINGLE-USER APP. It does not need to be pretty, or even very user-friendly.

PROBLEM

Imagine a magnet mounted inside a ball, so it can rotate randomly in any orientation. ... like a cylindrical magnet stuffed into an orange.

As the orange rotates, the 3-axis magnetometer senses rough sinusoids, each going through a maximum and minimum as the ball rotates. I need these 3 input signals resolved to a single rotation... because I want to know how the ball is rotating as listed below. The overall magnitudes (s) will increase and decrease as the ball moves closer and further from the phone, but I don't care about these values. I'm looking for TWO pieces of information:

1) A rotation counter, recording how many times the ball rotates in a direction between "start" and "stop" (Note: When the ball reverses direction (meaning when the ball is rotating in a particular direction and then the inverse signal is measured.... the inverse signal will NOT be a perfect mirror of the original because the ball will wobble or be off-axis slightly, and the algorithm needs to accommodate this variation.)

2) Angular velocity of the ball rotation (rev/second) This does NOT need to be accurate +/- 20% is fine.

Again, I'm NOT interested in accumulated 3D data over time. I'm resolving collected 3D input (XYZ) into a single output, because in the real world the orientation of a ball does not matter.

RAW DATA

A sample of raw data from the three sensors is provided. The motion is not fast: maximum 1 revolution/second

FOCUS

As mentioned above, do not quote as if this is a full application. That comes later. This app is purely functional data collection. Very basic.

My current belief is that programmers who do not have mathematical skills will find this app difficult... And programmers comfortable with math will find this app easy.

Tietoa työnantajasta:
( 6 arvostelua ) Berkeley, United States

Projektin tunnus: #18000558

## 29 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön

Yugene90

Hiya! I just checked your project “Real-time sensor app” and get interested in your project. I am a results focused highly skilled developer with a proven track record. 1. I Keep my promises and meet deadlines Lisää

\$500 USD 10 päivässä
(52 arvostelua)
7.9
\$526 USD 10 päivässä
(69 arvostelua)
7.5
technorizen

Hello, I m fulltime available for work , I saw your job post and you need Android + iphone app for " Real-time sensor app App "and i have skills in coding similar app and i believe that i can do it for you Lisää

\$500 USD 10 päivässä
(150 arvostelua)
8.4
yashtechsolution

https://www.freelancer.com/projects/mobile-phone/real-time-sensor-app/?w=f#placebidHello, I am a full stacking developer, I have worked many Application and live on application store, we will discuss about project f Lisää

\$555 USD 10 päivässä
(79 arvostelua)
7.4
wuyong2020

Hi, Hope you are doing well! I am professional mobile app developer with over 7 years experiences. I am very interested in this project. Hope to work with you. Best Regards

\$555 USD 10 päivässä
(44 arvostelua)
7.3
langlangFan

Hello, I hope you are well. I am an expert in Mobile development with 15+ years of experience and good track records. I have read your job description with exciting mood :) Please check my reviews; [login to view URL] Lisää

\$500 USD 15 päivässä
(61 arvostelua)
7.2
\$526 USD 10 päivässä
(35 arvostelua)
7.0
\$555 USD 10 päivässä
(38 arvostelua)
7.1
Julian29

Hello, I am available full time for work. I am experienced Android App developer, and looking to start working with you on your project STEP BY STEP FURTHER i have experienced with Android Studio PROGRAMMING and BA Lisää

\$500 USD 10 päivässä
(49 arvostelua)
7.1
ALLTECSOLUTION

Hi Hope you are doing well. I have reviewed your requirements and we can implement your time sensor app very well. We have developed hundreds of iOS apps and here are few of them. https: Lisää

\$555 USD 10 päivässä
(33 arvostelua)
6.0
SeniorFreeDev

How are you? I really would like to work for you. I'm full stack professional developer. I have rich development experience and have developed many apps. Lisää

\$556 USD 10 päivässä
(24 arvostelua)
5.7
hirakchhatbar

Hi,. I read entire description and can help you built the prototype that you are looking to start with. I am pretty good with maths. I have worked with magnetometers, accelerometers and gyros before in android app to Lisää

\$333 USD 10 päivässä
(54 arvostelua)
5.8
Thesynapses

Dear Client, Greetings from Synapse! We're also glad to share that we have a relevant experience in development of such kind of apps for past 5 years with strong competency over iOS, Android, and Windows. Many of Lisää

\$555 USD 10 päivässä
(2 arvostelua)
5.6
fullstackappcode

Hello I've read your description and can know that you'd like to build a real-time sensor app. As a senior developer who has good experience in Android/iOS app development, I'd like to help you with this project. Lisää

\$333 USD 2 päivässä
(6 arvostelua)
5.1
zainpacc

Expertise in MATLAB with a substantial background in sensor interfacing. I have completed various projects related to this field and can provide you your complete task in decided time frame with quality work. We can di Lisää

\$250 USD 5 päivässä
(52 arvostelua)
4.8
invokeitsol

Hello, I have read all the Description of your project that you are looking for a Real Time Sensor App on Android +iPhone+ Admin Panel platform. I can design and develop it for you perfectly with all Features & func Lisää

\$390 USD 10 päivässä
(3 arvostelua)
4.1
mobileappsites

Greetings..!!! WE WILL DO THIS WORK AS PER YOUR REQUIREMENT AND EXPECTATIONS. With the experience of over 1600+ web development projects including ANDROID, iOS, WEBSITES, WEB APPLICATIONS, AND SOFTWARES we are the f Lisää

\$555 USD 10 päivässä
(5 arvostelua)
3.1
Mobileappsoln

Hello, I am Mobile application developer having more than year experience in application development. Recently I have started work as freelance so I will put my 100% effort to done your work. We have a team of ex Lisää

\$250 USD 10 päivässä
(3 arvostelua)
4.2
KasunChameera94

HI, Saw that you are looking for a app developer to implement you a Sensor app to track some 3 axis magnetometer readings. I can help you with that most importantly i have an engineering background therefore i a Lisää

\$500 USD 15 päivässä
(4 arvostelua)
2.6
forgeDev15

I'm great with Maths, yet I find this a challenge so, I'm interested in your project Hello I've extesive experience in both android and ios you can expect fluid functionality, smooth UI and international look. He Lisää

\$250 USD 7 päivässä
(4 arvostelua)
2.0