pytrack sample code

[abhishek2101]

can somebody post sample code to get the LAT and LONG from the pytrack module and post to TTN ?

[dan]

@abhishek2101 Hi, you can find LoRaWAN example here with OTAA (and ABP) which includes sending data. You can get the coordinates from the Pytrack example. If you merge these 2 examples, it would solve your question. Let me know if you have any other questions!

[abhishek2101]

@dan
I am able to use above code and print the data, but out of all the data where can I find LAT, LONG and timestamp ?

[dan]

@abhishek2101 Line 37, it prints coordinates (LAT, LONG) coord and the time rtc.now()

[abhishek2101]

@dan
below is the output i am getting

(None, None) - (1970, 1, 1, 0, 2, 13, 827831, None) - 2547456

[dan]

@abhishek2101 for the time, you either have to set it yourself, or sync it with a NTP server (via WiFi or cellular). Are you inside a building? It might take a while (or even fail) to get a location, so I'd recommend trying it outside or near windows

[abhishek2101]

@dan
i am outside on a terrace.

[dan]

@abhishek2101 it might take some time to find a GPS satellite? If the issue persists, let me know and we'll look into it in detail.

[catalin]

hi @abhishek2101, it seems you have a GPS problem. I would recommend:

• leave the pytrack for 30 mins outside, to pick-up the satellites data, as this is a cold-start, could take a while
• check, with a mobile app, how many satellites are visible on your exact position, it could be a glitch

[abhishek2101]

@dan
can you let me know what are below lines doing in the code

l76 = L76GNSS(py, timeout=180)
chrono = Timer.Chrono()
chrono.start()
while (True):

    coord = l76.coordinates()
    print(coord)

[dan]

@abhishek2101

• Set up GPS module
• Start measuring timespan (docs) (but I'm not sure why it's there... It was probably left there by mistake, I'll look into that)
• Always get coordinates

[abhishek2101]

@dan
timeout=180
does this mean that chip will spend 180 sec before locking onto satellites ?

[dan]

@abhishek2101

Set the timeout to a time period (in seconds) for the GPS to search for a lock. If a lock is not found by the time the timeout has expired, the coordinates method will return (None, None).

docs

[abhishek2101]

@dan
mine is set for 180 seconds, that should be enough time to lock onto satellites, right ?

if this time is less, what do you think is the ideal time ?

does this mean that every update happens after 180 seconds, or it the first one only ?

[dan]

@abhishek2101 It's just the timeout for locking onto a satellite, so if after 180 seconds it doesn't find one, it returns None. In the example, we have 30.

It's just for the initialisation. After that, if you have it in a while(True) loop for example, it'll update around every second.

[abhishek2101]

@dan
Mine always return none even after initialising for 300 seconds.

Can you help please ?

[dan]

@abhishek2101 have you tried what @catalin recommended?

@catalin said in pytrack sample code:

hi @abhishek2101, it seems you have a GPS problem. I would recommend:

• leave the pytrack for 30 mins outside, to pick-up the satellites data, as this is a cold-start, could take a while
• check, with a mobile app, how many satellites are visible on your exact position, it could be a glitch

[abhishek2101]

@dan
I will try and report back.

But taking 30 min to lock onto satellites is simply not acceptable. It makes pytrack unusable.

[dan]

@abhishek2101 could you check the GPS coverage at your location? I have tested it here at the office and got the coordinates within a few seconds. I don't think it's a software or hardware issue.

[abhishek2101]

@dan
Google maps on my iPhone shows my location at the same place within few seconds.