Current mobile device detects touch event via sensing the capacitance change caused by human finger.
Is there any methods that I can get the raw capacitance value?
It seems that the android API does not provide such interface, but how can I give this data directly from driver?
I did some research on internet and found an excellent tutorial here.
Based on this tutorial, I write some scripts to get and visualize raw capacitance data from Samsung Galaxy SII (i9100). The code is available on my github.
Hope this may help someone who needs to do the same thing.
Related
I'm developing a mobile app with Ionic Framework 2, and using the plugin to get constantly the device accelerometer values in x,y,z. I would like to use that information to check if the device is moving, since the place where it's gonna be used is really small and the gps information oscillation wouldn't be precise. Since the accelerometer also has some oscillation, there would have to be some threshold, so it doesn't take that variation as a movement. Anyone did something like that and can give me some path for getting started? Looked for some implementation in that line and found nothing. Any suggestions? Thanks in advance!
I would like to figure out how to locate a device by its connection strenght(dBm). Even if this don't give me a direct location, it could give me a radius of the device to the phone or the other way around. So far i've been able to gather the device name and RSSI "strenght" however, its a dynamic data i'm getting. I would like an continuously update of how good the strenght is. So the part I'm stuck on is getting the correct values(ive got -72dbm and -342654dbm form the tests) and i need updates every 3 second.
What you should really do is use the Android Beacon Library, it will work the distance out for you.
The actual calculation is very complex and this Library has been used by a lot of people since Radius Networks created it. The link is for the website downloads, but you can use gradle too.
It's easy to use and probably exactly what you're looking for
I've been doing a bit of research on a problem we are trying to solve. I think this is the best approach but please add in your opinions
We are trying to calculate reaction times in a real world driving scenario and would like to use a mobile phone as the data collection device. What we are trying to accomplish is how much acceleration and more importantly deceleration a driver exerts when exposed to certain prompts.
I found this paper that has allot of useful information Accelerometer physics
The problem is that we most likely will not have a calibration time to start at zero.. however it is assumed that the driver is starting at 0. We will use GPS positioning to locate the vehicle, tracking the time stamped location data we should calculate the time when the prompt took place then using the time stamped accelerometer data we should be able to calculate their reaction to the prompt.
This is the best way I have found to solve the problem however I'm not sure if the accelerometer data will be rendered useless because of not being able to calibrate it and also the noise seen from vibrations may be too great to use the data... Has anyone tried or used these types of methods before?
Interesting application.
You are missing an important point. You either have to implement the so-called sensor fusion yourself or use the sensor fusion provided on the platform you are using. Both Android and iPhone have one.
The TYPE_LINEAR_ACCELERATION (Android, SensorManager) or userAcceleration (iPhone) should be sufficient for you.
As for the linked PDF, don't try integrating the acceleration, you will get very poor results. Even though that answer is about position, the velocity will already be inaccurate. I would try the GPS instead.
I know it's very old question but since I am recently working on a similar project let me share what we did in our company. We simply used OBD-II dongle to get velocity of car. There are many API's that return information about vehicle.
PID010D returns speed of vehicle. I'm using this PID to calculate distance between points A and B since there is no PID to return Odometer :(
There are few libraries on github that you can find easily by search. This mine. This is not library but after run on your device you can see how it works.
I'm researching on transferring text data over male-to-male audio jack cable.
I'm testing this on HTC one V and on PC, which supports male-to-male audio jack for data transfer as mentioned in this Wikipedia article. It says:
The first, which places the return signal on the second ring and the microphone on the sleeve, is used by Apple's iPhone line, HTC devices, latest Samsung, Nokia and Sony phones, among others.
You can see my code here.
Problems I face during transfer: if I generate tone by entering any value from 0-31 at sender side, receiver will get actual value in 2-3 try due to the wrong type of FSK modulation/demodulation. Would you suggest the best error correction code that will help me out for correcting the input received from another Android device?
If anyone has done this type of data transfer before, please suggest a code reference or some basic guidance regarding technical aspects, so I can complete this and make it open source for everyone.
I'm looking for the same, I got one awesome explination about Transfering data using audio signal in android by Sudar , go through once that may be helpful to you.
The slides here are even more detailed: Showing how to communicate with an Arduino and reading a light signal and convert it A/D.
http://de.slideshare.net/wolfpaulus/android-arduino-and-the-headphone-jack
I've been doing a bit of research on a problem we are trying to solve. I think this is the best approach but please add in your opinions
We are trying to calculate reaction times in a real world driving scenario and would like to use a mobile phone as the data collection device. What we are trying to accomplish is how much acceleration and more importantly deceleration a driver exerts when exposed to certain prompts.
I found this paper that has allot of useful information Accelerometer physics
The problem is that we most likely will not have a calibration time to start at zero.. however it is assumed that the driver is starting at 0. We will use GPS positioning to locate the vehicle, tracking the time stamped location data we should calculate the time when the prompt took place then using the time stamped accelerometer data we should be able to calculate their reaction to the prompt.
This is the best way I have found to solve the problem however I'm not sure if the accelerometer data will be rendered useless because of not being able to calibrate it and also the noise seen from vibrations may be too great to use the data... Has anyone tried or used these types of methods before?
Interesting application.
You are missing an important point. You either have to implement the so-called sensor fusion yourself or use the sensor fusion provided on the platform you are using. Both Android and iPhone have one.
The TYPE_LINEAR_ACCELERATION (Android, SensorManager) or userAcceleration (iPhone) should be sufficient for you.
As for the linked PDF, don't try integrating the acceleration, you will get very poor results. Even though that answer is about position, the velocity will already be inaccurate. I would try the GPS instead.
I know it's very old question but since I am recently working on a similar project let me share what we did in our company. We simply used OBD-II dongle to get velocity of car. There are many API's that return information about vehicle.
PID010D returns speed of vehicle. I'm using this PID to calculate distance between points A and B since there is no PID to return Odometer :(
There are few libraries on github that you can find easily by search. This mine. This is not library but after run on your device you can see how it works.