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Different examples

MicroPython doc at https://docs.micropython.org/en/latest/index.html

Good blog post at https://www.raspberrypi.org/blog/raspberry-pi-pico-balloon-tracker/.

Good tutorials:

Read and log GPS data from the Pico

Wiring

The code is in read_serial.py.
Here the GPS is an Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates - Version 3

Serial port is read, and NMEA Sentences are built.
Each completed NMEA Sentence is logged, and the led blinks.

From a Raspberry Pi, copy the Python scripts on the board, so they can be executed later on:

$ rshell -p /dev/ttyACM0 --buffer-size 2048
Using buffer-size of 2048
Connecting to /dev/ttyACM0 (buffer-size 2048)...
Trying to connect to REPL  connected
Testing if ubinascii.unhexlify exists ... Y
Retrieving root directories ... /dump_serial.py/ /gps_log.nmea/ /log_temp.py/ /read_serial.py/ /temperature.txt/
Setting time ... Feb 19, 2021 15:50:21
Evaluating board_name ... pyboard
Retrieving time epoch ... Jan 01, 1970
Welcome to rshell. Use Control-D (or the exit command) to exit rshell.
/home/pi/repos/small-boards/RaspberryPi-Pico/MicroPython> cp read_serial.py /pyboard
/home/pi/repos/small-boards/RaspberryPi-Pico/MicroPython> exit

Then execute a script:

$ minicom -o -D /dev/ttyACM0 -b 115200

Welcome to minicom 2.7.1

OPTIONS: I18n 
Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyACM0, 15:51:17

Press CTRL-A Z for help on special keys


>>> exec(open("read_serial.py").read())
NMEA Data: $GPGGA,235301.094,,,,,0,0,,,M,,M,,*43
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $GPRMC,235301.094,V,,,,,0.00,0.00,190221,,,N*4F
NMEA Data: $GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32
NMEA Data: $GPGGA,235302.094,,,,,0,0,,,M,,M,,*40
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $GPRMC,235302.094,V,,,,,0.00,0.00,190221,,,N*4C
NMEA Data: $GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32
NMEA Data: $GPGGA,235303.094,,,,,0,0,,,M,,M,,*41
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $GPRMC,235303.094,V,,,,,0.00,0.0,0.00,T,,M,0.00,N,0.00,K,N*32
NMEA Data: $GPGGA,235304.094,,,,,0,0,,,M,,M,,*46
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $GPGSV,1,1,02,19,,,31,17,,,24*71
NMEA Data: $GPRMC,235304.094,V,,,,,0.00,0.0,N*4A
NMEA Data: $GPVTG,0.00,T,,M,0.00,N,0.00,K,N$GPGGA,235305.094,,,,,0,0,,,M,,M,,*47
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $G.00,0.00,190221,,,N*4B
NMEA Data: $GPVTG,K,N*32
NMEA Data: $GPGGA,235306.094,,,,,0,0,,,M,,M,,*44
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $G4,V,,,,,0.00,0.00,190221,,,N*4M,0.00,N,0.00,K,N*32
NMEA Data: $GPGGA,235307.094,,,,,0,0,,,M,,M,,*45
NMEA Data: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
NMEA Data: $G,,,,0.00,0.00,190221,,,N*49
NMEA Data: $,0.00,K,N*32
. . .
NMEA Data: $GPGSA,A,3,18,13,23,20,15,29,26,,,,,,1.72,1.45,0.92*0E
NMEA Data: $GPRMC,071145.000,A,3744.9360,N,12230.4213,W,0.39,20.56,220221,,,D*4B
	>> 19814 record(s) in the log (1,418,518 bytes)
NMEA Data: $GPVTG,20.56,T,,M,0.39,N,0.73,K,$GPGGA,071146.000,3744.9359,N,12230.4212,W,2,7,1.45,9.0,M,-25.5,M,0000,0000*6C
NMEA Data: $GPGSA,A,3,18,13,23,20,15,29,26,,,,,,1.72,1.45,0.92*0E
NMEA Data: $GPRMC,071146.000,A,3744.9359,N,12230.4212,W,0.42,20.56,220221,,,D*4F
Drive is full, exiting.

Note: for the script of your choice to be executed when the Pico starts, copy it as /pyboard/main.py.

After that, you can see/download the log file through rshell:

$ rshell -p /dev/ttyACM0 --buffer-size 2048
/home/pi/repos/small-boards/RaspberryPi-Pico/MicroPython> ls -l /gps_log.nmea
 10867 Dec 31 16:20 /gps_log.nmea
/home/pi/repos/small-boards/RaspberryPi-Pico/MicroPython> cp /gps_log.nmea .
/home/pi/repos/small-boards/RaspberryPi-Pico/MicroPython> exit

Your file is now available locally, for procesing if needed

$ head gps_log.nmea 
$GPRMC,014132.000,A,3745.0115,N,12230.4638,W,1.54,280.74,220221,,,A*7A
$GPRMC,014133.000,A,3745.0114,N,12230.4639,W,1.49,283.92,220221,,,A*7C
$GPRMC,014134.000,A,3745.0116,N,12230.4643,W,2.67,286.20,220221,,,A*77
$GPRMC,014135.000,A,3745.0119,N,12230.4648,W,3.62,288.48,220221,,,A*76
$GPRMC,014136.000,A,3745.0123,N,12230.4655,W,3.84,291.10,220221,,,A*7D
$GPRMC,014137.000,A,3745.0122,N,12230.4655,W,2.44,293.56,220221,,,A*70
$GPRMC,014138.000,A,3745.0122,N,12230.4654,W,1.70,318.61,220221,,,A*7C
$GPRMC,014139.000,A,3745.0118,N,12230.4650,W,0.76,290.12,220221,,,A*72
$GPRMC,014140.000,A,3745.0116,N,12230.4648,W,1.17,323.42,220221,,,A*71
. . .

Note: the Pico has ~1.3Mb of flash memory. You might want to filter the data to log, to save space (the read_serial.py script filters on RMC strings), or even impose an iterval between recordings.

With a filter on RMC (no minimum interval), I was able to log about 5:30 hours of data.

From 22-02-21 01:41:32 UTC to 22-02-21 07:11:45 UTC

Works fine from Thonny too:

Note: In Thonny, I used the menu Tools > Options... > Interpreter, and choosed MicroPython (generic)/Board in FS mode - Board CDC (dev/ttyACM0). Updating my Thonny to its last version would probably show what the doc is talking about. Anyway, that works.

Thonny

Energy Consumption

In this config, the Pico consumes between 0.02 and 0.03 Amps.

Further

To parse NMEA data in Python, see this