First of: Thank you very much for your code and tremendous work in your blog. Thanks to you, I got my Feather M0 with LoRa and GPS feather transmitting to ttn in less than a day.

Now my goal is to push this data to APRS.fi for mapping, but that is a different deal.
I tried to get the lowpower version to work, but I encountered two errors:

#include "LowPower.h"

Requires to install the low-power library from rocketscream, correct? I did this, but it won't compile:

ttn_gps_tracker_lowpower.ino:270:16: error: 'class LowPowerClass' has no member named 'powerDown'
       LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);

Furthermore:

ttn_gps_tracker_lowpower.ino:274:11: error: 'cli' was not declared in this scope
       cli();
           ^
ttn_gps_tracker_lowpower.ino:276:11: error: 'sei' was not declared in this scope
       sei();
           ^

I take it this may be due to incompatibility with the M0 chip?

I might have missed your blog entry explaining how you implemented low power with this library.
Cheers

Hello,

I am trying to compile this for the adafruit feather m0 RFM915 (SAMD21) and i am running into this error:
undefined reference to timer0_overflow_count'
from here:

  cli();
      timer0_overflow_count += 8 * 64 * clockCyclesPerMicrosecond();
      sei();

Also, for cli() and sei() i get these errors:

'cli' was not declared in this scope
'sei' was not declared in this scope

Any help would be highly appreciated taking into consideration that your project is what i need for my setup. Thanks

First; thanks for the guide at the ttn site and the code.

I just tried to copy your project with a brand-new feather 32u4 lora and a gps featherwing but while compiling it fails for 32u4. “Sketch too big”. According to Arduino IDE I use 29908 bytes / 104% (Max. 28672 bytes).

Common problem or just my setup?

again, thanks!

`Arduino: 1.8.10 (Windows 10), Board: "Adafruit Feather 32u4"

Sketch uses 29908 bytes (104%) of program storage space. Maximum is 28672 bytes.
Global variables use 2112 bytes of dynamic memory.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Adafruit Feather 32u4.`

I'm using the Adafruit Feather 32u4 Lora with the Ultimate GPS featherwing as described in the documentation but I'm getting the following error compiling to the Feather 32u4.

Sketch uses 30030 bytes (104%) of program storage space. Maximum is 28672 bytes.
Global variables use 1937 bytes of dynamic memory.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Adafruit Feather 32u4.

Any suggestions?

I'm getting strange gps readouts
{
"altitude": 167509.12,
"hdop": 0.5,
"latitude": -109.794,
"longitude": 454.1587
}

then some other, then other.. hm. I did everything right