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If i had 2+ devices connected to a wifi direct access point would it technically be possible in theory to ascertain the devices physical position in relation to each other?
Thanks
In theory it is possible to get an estimate of their directions to each other when using multiple receive antennas.
Modern notebooks and access points often have multiple antennas for MIMO communication, which increases the reliability and/or the bandwidth. Devices like these could be used for what is called Direction-of-Arrival estimation.
This is a non-trivial topic and doesn't really belong in Stackoverlow but for a mathematical introduction you could look at this paper
Don't see how; location determined via wifi is based on the location of the access point.
not really. You could connect over bluetooth to calculate this. But it's not really reliable. Because you have only the signal strenght for calculating the difference between two devices.
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I am trying to create my own openPGP token according to this site, https://nx3d.org/gnuk-st-link-v2/
I bought two ST-LINK V2 clone via Aliexpress but unfortunately my ST-LINK V2s don't have 4 connection points
I think the best way for me is to buy another ST-LINK V2 clone which has the four points. However, I need two weeks for delivery. Therefore I want to try something during the delivery. Don't you have any idea?
Currently I have female-female wires and female-male wires but don't have any other electric tools.
I see four solder pads in the lower left of the first image, right next to the USB connector. The image is too blurry for me to be certain, but I suspect those make up a SWD port. You will need a soldering iron and some fine wire (I recommend 30ga wire-wrap wire) to attach a programmer.
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I am interested in measuring how much energy my solar cells create. This is a "plug-in" system which connects directly to the socket. My question is whether I can use the Fibaro Wall Plug system to measure negative power flows as well?
I asked that question to Fibaro support and this is the answers on 12 sept 2016:
Hello, Unfortunately, there is no way to measure a negative power.
This functionality was not taken into consideration when the device
was designed. I will forward Your suggestion to constructors with
question about possibility of integration. If possible, this
functionality will be added together with the next firmware versions
Ragards
I haven't seen an upgrade since.
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I want to erase only some part of locations to be modified in my application. Does the EEPROM supports these featrue? or they ar one time programmable?
From Wikipedia:
[EEPROM] is a type of non-volatile memory used in computers and other electronic devices to store small amounts of data that must be saved when power is removed, e.g., calibration tables or device configuration. Most components (such as RTC) uses them to store their configuration (do an interrupt everyday at eight, for instance).
You may indeed reprogram it (to set the alarm for example). The difficulty of it depends on the device and the support available for it, of which you give no information whatsoever.
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I'm currently doing an internship in a medical laboratory
They want to buy Ipad and medical device connected to it
example: diabet tester http://www.ibgstar.us/
blood pressure monitoring system http://www.ihealth99.com/
I'm wondering if I can code my own application that gets the data from the medical device and then handle it?
thks for your answers
I think they're some step to success it .
At first you need a Hardware solution like said "Mundi".
You need to grab data from device and store them somewhere accessible (like in a BDD with online acces).
And then the iPad application just have to connecte to the data-Source and play with it
The short answer is YES.
There are many ways to get the data into the app via a network. If you would like to read from the device directly, you would have to additionally find a hardware solution.
I'm not sure this applies, but I've seen some really cool medical apps written using Harvard's SMART project. They provide a simple but effective framework, which is independent of the Hospital Information System (like Cerner, Epic, VistA).
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Hi I am testing my application for various types of internet connections with my device. I want my application send an internet request only if WI-FI is available and not in other cases like GPS ,WAP, 3G, etc....
Please also provide some information about how to check the current speed of that particular connection.
Thanks in advance
Use Apple's Reachability class to check for Wifi or WAN. Use this example and code: http://developer.apple.com/library/ios/#samplecode/Reachability/index.html
Checking the speed is more difficult, you would need to measure it by your own I think, maybe the best way is to ping and measure the response latency.