Weltraum

Log and display GPS data from USB GPRS module on Waveshare 2.9in ePaper display

Author: Omar Metwally, MD

        omar@analog.earth

Usage

Get USB GPRS module path

dmesg | grep tty

(On my machine, this is /dev/ttyACM0)

Log latitude and longitude to file

sudo python3 log_gps.py

Install gpsbabel

sudo apt-get install gpsbabel

Convert file from step to GPX file

gpsbabel -i csv -f way.csv -o gpx -F way.gpx

alernatively, run this script:

chmod +x gen_gpx.sh
./gen_gpx.sh

Run on Pi boot

cd ~
sudo vim .bashrc
    (add this line to the bottom:)
    python /home/pi/Desktop/weltraum/main.py

6. Display GPS coordinates on ePaper module

Install pre-requisite Python libraries:

Connect ePaper display as follows:

Raspberry Pi GPIO Pin map 

 +-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT5 | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | ALT5 | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI | ALT0 | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO | ALT0 | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK | ALT0 | 0 | 23 || 24 | 1 | OUT  | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | OUT  | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |  OUT | 1 | 35 || 36 | 1 | OUT  | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+

  == Hardware connection ==
    EPD    =>    Raspberry Pi
  * VCC    ->    3.3
  * GND    ->    GND
  * DIN    ->    MOSI
  * CLK    ->    SCLK
  * CS     ->    24 (Physical, BCM: CE0, 8)
  * D/C    ->    22 (Physical, BCM: 25)
  * RES    ->    11 (Physical, BCM: 17)
  * BUSY   ->    18 (Physical, BCM: 24)

sudo python main.py

Notice that main.py is run with the Python2 interpreter

osmode/weltraum