I'm working on a school project on which I need to identify a ship model to get its height.
For it, I'd like to use a GPS emitter (because each ship has already one). This emitter should emit an ID that would allow me to get ship' informations into a database.
I don't know how to write custom data in a GPS emission.
Also, I would rather use Arduino.
GPS is receive-only. It calculates its position according to what it receives.
Related
I'm working on a BMS project for an electric car. I'm using LTC6804-2 for voltage and temperature measurement in each cells. As a first step of development, I would like to establish a successful communication with the monitoring IC (LTC6804-2). So, I'm sending set config register command and trying to read back the config register values that I have written. If I receive the configuration register values without a CRC error, I consider my communication as successful.
In my case, I do not receive expected register values with proper CRC when I read back. Let me break down my situation into small segments.
I'm working on a custom BMS board for this project(LTC6804-2 and STM32F072). I will attach the schematics below. To test my code, I tested my program with DC1942C demo board and arduino UNO. And it is working fine. I can read back the config register and I can calculate the cell voltage and Auxiliary values.
When I try to implement the same program in my custom BMS board, I'm not getting the correct values. I always get CRC error in the received data.
Following the guidelines from the Analog Devices forum, I tested the Vref2 value after sending the config register command, and the voltage goes up to ~3V as expected. So the IC is receiving the message properly. But Why it is not transmitting back?
Below are the captures from the demo board and BMS custom board.
Register read capture from Arduino Uno and demo board DC1942C
Register read capture from the custom board
In fact I tested the program with STM32 development board and DC1942 demo board, I get the correct values.
Thank you for your help. If you want any additional details, please let me know.
LTC6810-2 datasheet
I'm using WebRTC to build a Skype-like application. I want one party to be able to send a feed from their webcam, while sharing their screen at the same time.
On the receiving end, however, I can't find any way to identify what type of stream I'm receiving -- label and ID are reset to a new value (bummer, I was hoping to identify it by its source ID), and I can't find any options for adding my own metadata to the streams or tracks. How does the receiving client know what type of media I'm sending them?
Any ideas? Thanks in advance!
As it turns out, MediaStreamTracks get a new ID assigned on the other side. MediaStreams however, keep their assigned IDs, so use those when doing AddTrack, and then use a DataChannel to send information about the stream based on its ID.
i am doing a project which takes gps cordinates from the gps module and send sms of those locations through gsm module for preset numbers . But , i want to upgrade this. I want to send the name of that location through sms after gathering the gps co-ordinates value . How to do this ? Is there a need of setting up the database to match the co-ordinates ? I am new to these things
A service to map coordinates to place names is called a "reverse geocoder". For example, see this API reference for Android: http://developer.android.com/reference/android/location/Geocoder.html
You may need an active Internet connection for this service to work, however.
I am working on a project which uses a PIC24FJ64GA002 mcu.
I am working on a bit-banged serial communication function that will use one wire to send data and then switch to receive mode to receive data on the same pin. A separate pin will be used for clocking which will always be controlled by a different board (always an input). I am wondering is there a way to configure the pin for open-collector operation that that it can be used as an input and and output or do I have to change the pin configuration every time i go from reading to writing?
You need to change the direction of the pin each time by using the TRIS register. If the pin is set up as an output, reading the PORT register will most likely only tell you what level you are driving the pin to (assuming there is a high impedance on the pin). If the pin is set for input, you won't be able to drive your desired output value.
Also, make sure that you read incoming data using the PORT register, but output the data using the LAT register. This ensures that you don't suffer any issues if your code (I assume you are programming in C here) gets converted into bset/bclr/btgl instructions which are Read-Modify-Write. If you are writing in assembler, the same rule applies but you know when you are using these R-M-W type instructions. If you want more reasoning on this, please ask.
im trying to read the current position of GPS Device...using N95 from Nokia.
I read tht i will need my device to return the NMEA lines to the serialport and then i will parse/split it to get things I want but all along I dont know what to write to the serialport to make device return the NMEA ?
Like There are other commands of AT for messaging etc...Is there any specific command to send to serialport to get NMEA ???
I found this site site which seems to guide you through everything you need to do.
I am not sure how it works in the N95, but in my HTC phone you cannot send commands to the GPS device to have it behave in a certain manner. Once I am connected to the serial port that the GPS device uses I can read a stream of data coming from it, which happens to be NMEA data. There is no way that I have found to send commands to the device to tell it how to behave.
I haven't used that specific GPS device before, but for mine, I just have to open the port and I start receiving the NMEA data immediately.
I have an N82, and as far as I know it doesn't speak NMEA directly. I use a script from this page - specifically one the titled "# Turn your S60 phone with an internal GPS (eg your N95) into a Bluetooth GPS" - to get NMEA strings.
Ahh oki so I need to run some script.Oki I think i should buy a specific GPS Device for it.
Which device will do my job in cheapest manner ?
I've never worked specifically with the N95, but most GPS devices will just start spitting out NMEA as soon as they're powered up, regardless of whether or not they have a lock. I don't know how the N95 is designed, but I'll bet it probably wasn't designed to give you access to the raw NMEA data from the GPS. You'll probably need some pretty fancy trickery to get it to do that.
If you don't need to use the N95, you might find it easier to just get a GPS module and use that instead. I've always purchased mine from SparkFun. They have some good evaluation boards boards and tutorials to help you get started.
A great way of doing this in Java ME is to use JSR 179: the Location API. Your app needs to create an implementation of LocationListener, then set it on the default LocationProvider. When your listener's locationUpdated method gets called, call:
location.getExtraInfo("application/X-jsr179-location-nmea");
This will provide access to the NMEA sentences.
You can send this over a serial port by using the Java ME commports mechanism (use:
System.getProperty("microedition.commports");
as described here).
Hope this helps,
funkybro