There are two wavelength 1511nm and 1491nm for Huawei ST2 cards, but how can I choose the working wavelength?
Related
I'm working at the mine on the drill machines. I've been given a project to find a communication system that can interface magnetic pickup sensor (MSP6744) with a redlion conveter (IFMA0035). It has to be a wireless transmitter and receiver. We are measuring speed of the rotating rod (rpm) on the gear teeth of the powerhead or gearbox by magnetic pick up. The sensor produce small voltage and max frequency of 1850Hz. This will be converted to 0-5volts then is send to control system.
I've been searching on google and contacting many companies but no luck.
I did my research and found one of the possible solution is to design it using ESP32 but i need lot of guidelines on this one.
Magnetic Pickup Description: A magnetic pickup is installed over a gear and as the gear turns the pickup will create an electric pulse for each tooth on the gear. These pulses are then read by the instrument which interprets it to indicate the correct RPMs or speed.The signal from the magnetic speed Sensor, teeth per second(HZ), is directly proportional to rotation speed.
I'm using the Estimote SDK (3.6.0) for the communication with my beacons. Now I have read somewhere, that it is possible to get the advertisement package of the beacons with 5 Hz. Is this only possible with Estimote beacons or does this work with beacons of other vendors too?
Where can I change this update interval in the source code?
Thanks.
Each beacon vendor usually provides some means to adjust their beacons' settings. Most often, that's in form of an app that you can download from the App Store or Google Play Store. In this particular case (Estimote), that'll be an app is simply called "Estimote." For more details, you should consult the vendor's documentation or inquire with their support team (:
One final thought: with Estimote Beacons, you operate on advertising interval of the beacon (i.e., the time between packets being broadcast) instead of frequency. Since one is just an inverse of the other, 5 Hz frequency (= 5 times a second) is equivalent to a 200 ms interval.
Is there any APIs available in which can provide me with the following details:
Signal Quality
Country Code
Network Code
Area Code
Cell ID
Base Station ID
GPRS Cell ID
GPRS Base Station ID
Signal Strength;
Max Signal Strength
But what I need if it is not available to retrive Signal Strength in dbm
Note: I can get this information manually by dialing 3001#12345# as shown in the following screen shot from my iPhone (Signal Strength showed in the upper left corner in dbm):
https://picasaweb.google.com/lh/photo/Qf6MBY2jtfpWImTyTHk4Gg?feat=directlink
Apple has not officially provided any API to calculate the signal strength.
But you can refer to official Core Telephony framework (CTCarrier Class) to get some of the details such as Country Code,Network Code etc.
Can you get signal strength measurements of Mobile Networks in iOS and/or Android?
On developer.apple.com I have found CoreWLANWirelessManager sample code for OSX, that shows how to get measurements for WiFi networks.
For Android, what about PhoneStateListener?
Is there is a way to determine an iPhone's exact location (indoors, and to a distance of just a couple of feet) via use of radio/antenna's or some other infrastructure located around premises (i.e a hospital, shopping mall, school). Will appreciate any ideas/direction (technologies, research) as for how to overcome this limitation.
If you mean for an area you have control over (setting up a location network for a specific school/hospital) as opposed to generic location, you'd be able to triangulate your position based on wifi signal power for APs with known locations.
If you wanted it to be a generic solution, and you know there would be multiple APs in/around the buildings you wanted, you could triangulate all wifi signals while you have GPS outside the building, and then reference those locations when you lose gps accuracy. The first part is something that many wardriving applications already do.
Here's an article describing a commercial technology for this purpose in high-level detail: link
And here's a link to a SO page where people have started discussing possible methodologies: link
Use the GPS and hope that you got good coverage.
Other than this, you can deploy several wifi hotspots that can measure the signal strength for each packet and do a triangulation to calculate the iPhone position with regards to three or more of these hotspots based on the signal strength each of them measured.
A quick search for "signal triangulation" on the internet reveals a Wi-Fi Based Real-Time Location Tracking technology from Cisco. I have not used it, so I can't vouch for it; and I suspect it's rather expensive. There might be other solutions as well.
The alternative would be to buy several wifi routers or access points and flash them with your own version of the firmware. You can probably use OpenWRT or DD-WRT as a base for this.