If I connect to my wireless router, the positioning becomes very accurate. However if I am not connected to wireless even though I am near it, the positioning is NOT accurate. I am using a Android LG P-690 phone.
Why connecting to my wireless gives this much more accurate result? Is the position of my wireless registered in some database from the ISP, and how does Android have access to that data?
Yes the position of your wireless is registered somewhere. Google uses this to find locations. Your wireless probably got registered by your own phone, at some point you got a good GPS fix while the phone could see your wireless router, and that information got transmitted to google to register that gps position with that router.
Related
I am working with the AM64x board. Check with the sample USB Host code. It does not initialize properly when something is plugged into the port on bootup.
The USB device I am trying to use draws only a small current. Connect the phone it get charged.
I don't really understand what this error is, or how to correct it
I am sorry, this might not be the correct platform to ask this kind of question but I couldn't think of any other place .
I for one of my project I need to capture some video footage from an outdoor camera using open cv. Actually, its a part of a bigger project where another signal triggers the camera. Since the camera will be located outside, I am looking for weather proof night vision enabled USB cameras that I can easily control via OPENCV. However I cannot find any descent USB camera and most of the websites show IP cameras. My problem is that the installation will be at a site where there is no internet so I cannot use internet. Can anybody please suggest if and how these IP cameras can be connected to the PC and be controlled via OPEN CV or else suggest some websites where I can get descent outdoor USB IR cameras.
I have also tried the NOIR Raspi camera but the quality is not very good and I think the range will also not be very good. Moreover running OPEN CV on RpI is very slow even for simple video recording.
Please refer to that thread for how to use IP cameras with open CV. I didn't try it personally, but a simple google search got me that. http://answers.opencv.org/question/133/how-do-i-access-an-ip-camera/
To access an IP camera is very simple, you just need this line:
cv2.VideoCapture("rstp://ipaddress:port/blahbla")
Now, if you dont have internet the IP camera as the PI should be on the same network, you can have a wireless router with no internet.
If you dont have a wireless router you can create a hotspot on your PI so you can connect the Camera directly to the PI, alot of IP cameras support hotspot so you can connect your pi to them.
I'm currently studying the Development Guide given with the Sony Camera Remote API beta SDK, and what I've understood so far, is that in order to send and receive messages between a camera and a mobile device, the smartphone or tablet should be connected through Wifi to the camera, which acts as an access point.
Actually, what I'd like to do after downloading a picture on the mobile device from the camera, is to pass it to a PC so that I will be able to print it and use it for other purposes. This process should be completely transparent and automatic for the final user.
Thus, my problem is that I need the mobile device to be connected, through Wifi, to both camera and PC.
The solutions I have in mind are :
Make the mobile device, and the PC, connect to the camera access point, so that they can be located on the same network.
Is this possible? I mean, can the Sony camera handle more than one client when acting as an access point? If yes, can I have a fixed IP for mobile device and PC so that I can easily make them exchange data?
Use a simple wifi router and make the camera, mobile device, and PC connect to this router.
Without acting as an access point (i.e. simple network client), can the camera be used with the remote control function?
If you guys see any other options, I'd be glad to read them !
Thanks,
Bertrand
Unfortunately, neither of your solutions would be supported. Only one device can be connected to the camera AP at a time, and the camera itself has to act as the access point (certain models support connecting to an access point from the camera but the Camera Remote API is not supported in this case).
If you don't need the mobile device to have access to the pictures, your best bet may be to directly connect the PC to the Camera and transfer the images using the API. The API is REST based so can be used on any platform.
I am trying to connect 2 kinect sensors to my notebook. I know that I have to have at least 2 separate USB 2.0 controllers. According to tis website: LINK I have the same settings as in the picture. So I think that connecting 2 kinect sensors should be possible for me. I have 3 regular USB2 ports and one combined with e-SATA. So I have 4 ports to connect USB devices. However, when I try to connect 2 Kinect sensors (each time into different ports), I am always getting error message on one device (in windows device manager):
This device cannot start. (Code 10)
Can anyone help me please? I do not have any other computer and dont want to buy new just because USB controllers. I thing there has to be a way to do this. Thank you
can you please get a schematic of your notebook's motherboard and double check how your 3 ports are connected to the 2 controllers you mention. Hopefully 1 out of the 3 ports will be connected to a different controller from other 2 ports.
Does your notebook allow you to connect an express card to it ? Perhaps you could get an additional port this way.
With a custom built PC and a PCI Express USB expansion card we've got 3 kinects connected at the same time for an art-installation/robotics project.
I remember though at the time getting 2 Kinects running at the same time on my old 2008 macbook with no problems. Note that this was with either the libfreenect and OpenNI drivers, since the Kinect SDK driver doesn't work on osx.
Also, since you're using the Kinect SDK, I'm guessing you are using either Kinect for Windows (v1 if you will) or Kinect for Xbox360 and not the Kinect 2 for Windows since the current Alpha release of the SDK currently only allows a single sensor.
Update
Had a quick look here:
although couldn't easily find the schematics. My guess is two USB ports are connected to the same controller and the 3rd USB port might(don't take my word for it, check the manufacturers specs) be connected to a separate usb controller, in which case connecting one kinect to one side of your laptop and the other kinect to the port on the opposite should work. Make sure you see both sensors in Device Manager(run devmgmt.msc).
Also, just to double check your sensors as well, try connecting one, running a demo/test, then disconnecting and using a second sensor on the same port.
If both sensors work individually work on the same port, test them also on the usb port on the opposite side. You just want to make sure neither the sensors nor your ports are faulty. Lastly, if your hardware looks fine (power is good, sensors and ports are good), double check your code and me sure you don't accidentally open the same sensor twice or any other mistake that might be easy to miss.
If you have a friend you can either borrow another laptop for a short time just to test that would also be good. You can also try getting an USB Express Card™ card for your laptop. Although a long shot, you could try to disable other usb devices on your laptop, leaving as much bandwidth available to the ports as possible. You should be able to do this either from Device Manager or your potentially from BIOS settings.
I would like to create an application that connects to the internet by using WiFi. That's easy, but i also want to connect the iOS device to a standalone WiFi device. (Device is classified)
So basically i want to connect programmatically to two devices at once using a single WiFi chip
Is this even possible (couldn't find anything that proves so on internet). And if possible, how do i do it?
iOS device can't be connected to two different wireless networks at the same time.
Even more: you can't programmatically switch between the two networks - user has
to do it trough the settings application.
So: if the device is on the same wireless network as your router (gateway to internet) then you'll have no problems connecting iOS to internet and to your classified device.
However: if classified device is on a seperate (possibly AdHoc) network then user will have to switch between connection to internet and connection to classified devices's wireless network.
If you're the designer of classified device it would be best if you can manage the connection trough wireless access point. This would be the only way to connect iOS device to your classified device and internet at the same time.