Has anyone tried sending GPS coords to TTN?

End Devices (Nodes) Hardware
21

Thanks for sharing. However, I do not have those hw/resource and the frequency is EU.

22

rxrx

// whatā€™s the name of the hardware serial port?
#define GPSSerial Serial1

23

I have added #define GPSSerial Serial1

Serial output : However, not receiving any packet in the console.

Sta69,N,01323.7657,E,0.16,292.15,040118,A6F
$GPVTG,292.15,T,M,0.16,N,0.30,K,A34
Packet queued

$GPRMC,095352.000,A,5232.2469,N,01323.7657,E,0.16,292.15,040118,A6F
$GPVTG,292.15,T,M,0.16,N,0.30,K,A34
Packet queued
Starting
,603
$GPRMC,095356.000,A,5232.2473,N,01323.7654,E,0.25,292.15,040118,A63
$GPVTG,292.15,T,M,0.25,N,0.47,K,A*34
$GPGGA,095357.000,5232.2474,N,01323.7655,E,1,06,0.98,69.3,M,44.7,M,5C
$GPGSA,A,3,09,03,31,17,22,02,1.30,0.98,0.86Packet queued

Codeā€¦

24

hi,

pls read this when you are placing lots of code

did you see the edited picture ā€¦ youre wiring is wrong for the mega

25

Thank you. I have changed the Pinout : GPS >> Mega

VIN >> 5V
GND >> GND
Tx >> RX1 (19)
Rx >> TX1 (18)

Is it correct? The GPS got a fix but no data in the console

26

If I was you I disconnect the lora board from the mega and first try to get communication between the mega and the GPS module.
also I think that the signallevel from the GPS is to low for the mega but Iā€™m not sure @ this moment

27

Iā€™m trying to get a TTN Mapper node working with Pro Mini, RFM95W, Neo6 GPS, and a small OLED display with the position information. I want it to be able to happily run in the background unless I press a button to turn on the display.

All working fine, except it takes longer than normal to lock, and doesnā€™t take read all the position data in one go - it will update long, say, then a few iterations later HDOP, Alt etc. All this makes me suspect itā€™s not reading the serial feed properly.

I clearly donā€™t understand the scheduling of lmic and/or how to handle the softserial port. Iā€™ve got the GPS feeding into ss(9, 8). Iā€™ve got the serial GPS reading in do_send (see below) which just doesnā€™t feel like the right place for it. Would it make more sense (and be cleaner) to do the reading and OLED update in an interrupt service routine?

*Forgot to say - Iā€™m using the sample ttn-abp code as a base, and TinyGPS++.

Mark

void do_send(osjob_t* j) {
  // Check if there is not a current TX/RX job running
  if (LMIC.opmode & OP_TXRXPEND) {
    Serial.println(F("OP_TXRXPEND, not sending"));
  } else {

    while (ss.available())
      GPS.encode(ss.read());

    oled.clear();
    if (GPS.location.lat() == 0.0) {
      oled.println("NO FIX :(");
    }
    else {
      oled.println("FIX LOCKED!");
      oled.print("Lat: "); oled.println(GPS.location.lat(), 6);
      oled.print("Lon: "); oled.println(GPS.location.lng(), 6);
      oled.print("Alt: "); oled.print(GPS.altitude.meters(), 1); oled.print(" ");
      oled.print("HDOP: "); oled.print(GPS.hdop.hdop(), 1);
    }

    lpp.reset(); // clear the buffer
    lpp.addGPS(1, GPS.location.lat(), GPS.location.lng(), GPS.altitude.meters());                 
    LMIC_setTxData2(1, lpp.getBuffer(),  lpp.getSize(), 0);
    Serial.println(F("Packet queued"));
  }

}
28

Not exactly the same, but a sort of similar question passed by in another topic. Maybe this example may be useful for you too.

1 Like
29

Thank, Iā€™ll have a look tomorrow. Brain fried :slight_smile:

1 Like
30

Yup, that works just nicely. Thanks for the link!

1 Like
31

@ duineuk

You say you use a pro-mini, rfm95, neo6 and a small OLED

I use exact these parts and my GPS-tracker works fine except that I cannot use the 128*64 Oled, I could not find a library small enough to fit in the sketch.
I do not use any sensor and modified the LMIC library a bit so it is 4k smaller (explained in document of ttn_nodeworkshop). There is almost 8kB memory left so maybe a oled can be used.

Which Oled-library are you using with the code on the pro-mini ?

32

Iā€™m away from home right now so canā€™t check my source. But it was this or one like it:

Basically you want a text only 1306 driver. Itā€™s the bitmapped screen buffering that takes up the memory - limiting to text drastically reduces the footprint.

1 Like
33

Thanks .

I found the library in the library manager of the arduino IDE.
It works cool.

1 Like
34

Have you also tried U8x8 (part of U8g2)?

35

Hello may try this ?