Hello, please am new here. I have 3 GPS devices which have their own individual andruino. And i am trying to connect them to a single app (android app) where a user can view their real time location. I just want to know if its possible. Thank U
what's the benefit of 3 GPS attached to the same Arduino? they will report the same location...
to your question - you'll need 3 Serial Ports, best if they are hardware, use a mega for example.
connect them to a single app
What do you mean by "connect"?
What "app" on which device?
J-M-L:
what's the benefit of 3 GPS attached to the same Arduino? they will report the same location...
Although it's kind of ridiculous for a hobby project, the use of 3 GPS receivers for a device isn't unheard of. Pretty much every modern plane and large scale UAV has triple redundant avionics (to include flight computers and even GPS receivers). If any one of the 3 GPS receivers provides bad data, the flight system has the ability to "vote it off the island" and ignore the bad data (or even hard restart the GPS device).
Basically, this practice is used for reliability. I don't know, however, if this is why OP wants 3 GPS receivers for their project....
Power_Broker:
Pretty much every modern plane and large scale UAV has triple redundant avionics (to include flight computers and even GPS receivers). If any one of the 3 GPS receivers provides bad data, the flight system has the ability to "vote it off the island" and ignore the bad data (or even hard restart the GPS device).
Ah, IC.
I was thinking it might be Boeing looking for a 'fix'
srnet:
Ah, IC.
I was thinking it might be Boeing looking for a 'fix'
LOL... 
(well - kinda sad though)
(I'm familiar with voting techniques but would not think this makes sense on an Arduino)
J-M-L:
... but would not think this makes sense on an Arduino...
also doesnt make sense on a model plane, nor using mass-production gps receivers either.
Please am sorry.... The 3 GPS will have their individual andruino
Mystik55:
Please am sorry.... The 3 GPS will have their individual andruino
so you have 3 devices somewhere around the world and they need to communicate with a 4th Arduino to share their positions ?
what's the communication mechanism?
I don't understand what u mean by communication mechanism... But i was thinking an android app. Please don't mind my ignorance... I am researching on ways to execute d project. Anything will help me
Thank u once again for ur time
well if you have a GPS in Paris, a GPS in Stockholm and a GPS in Berlin. How are they going to share their location with the Arduino sitting in Sydney? give him a call? with what phone and talking which language?
I just want to know if its possible and if u have anything that can help me
Mystik55:
I just want to know if its possible and if u have anything that can help me
Tell us exactly what you want to do and we'll tell you if it's possible
Power_Broker:
Tell us exactly what you want to do and we'll tell you if it's possible
I was given a project to build a prototyped transportation system where the data collected by the buses gps can then be overlaid onto google maps and the students can access it via mobile phone to display real time data. And each bus stops will have their own countdown signs... we have two bus stops
Might need to use SMS shields to get that sort of connectivity - literally sending texts to the base arduino/computer. WiFi, XBees, and NRF modules are all most likely useless for your application.
Typical iOT. sms is one way. Using a more capable 3G/4G modem for IP connectivity back towards a central service would probably be better or Lora / Sigfox type of small message.
The central service would then offer a web based query interface (with a REST API to embed that into better apps)
If I had to prototype this, the low hanging fruit would probably be a cheap second hand (even with cracked screen) android phone with a gps location collecting app feeding through 4G a central database hosted in the cloud. No arduino involved.