jdz/gps006.py

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Python
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2024-07-25 02:08:38 +00:00
#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time
from datetime import datetime
import os
import csv
import signal
# GPIO configuration
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
ser = serial.Serial('/dev/ttyUSB3', 115200)
ser.flushInput()
myhost = os.uname()[1]
# CSV file settings
csv_filename = f"gps_data_{myhost}.csv"
csv_headers = ["Timestamp", "Latitude", "Longitude"]
# Global flag for graceful exit
running = True
def signal_handler(sig, frame):
global running
print('You pressed Ctrl+C! Stopping GPS tracking...')
running = False
signal.signal(signal.SIGINT, signal_handler)
def parse_gps_data(gps_string):
parts = gps_string.split(',')
if len(parts) < 4:
return None
lat = float(parts[0][:2]) + float(parts[0][2:]) / 60
if parts[1] == 'S':
lat = -lat
lon = float(parts[2][:3]) + float(parts[2][3:]) / 60
if parts[3] == 'W':
lon = -lon
return f"{lat:.6f}", f"{lon:.6f}"
def write_to_csv(lat, lon):
timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
with open(csv_filename, mode='a', newline='') as file:
writer = csv.writer(file)
writer.writerow([timestamp, lat, lon])
def send_at(command, back, timeout):
ser.write((command + '\r\n').encode())
time.sleep(timeout)
if ser.inWaiting():
time.sleep(0.01)
rec_buff = ser.read(ser.inWaiting()).decode()
if back in rec_buff:
gps_data = rec_buff.split('+CGPSINFO: ')[1].split('\r\n')[0]
parsed_data = parse_gps_data(gps_data)
if parsed_data:
lat, lon = parsed_data
print(f"GPS: Lat: {lat}, Lon: {lon}")
write_to_csv(lat, lon)
return 1
return 0
def get_gps_position():
send_at('AT+CGPSINFO', '+CGPSINFO:', 1)
def initialize_gps():
print('Starting GPS')
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send_at('AT+CGPS=1', 'OK', 1)
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time.sleep(2)
# Create CSV file with headers if it doesn't exist
if not os.path.exists(csv_filename):
with open(csv_filename, mode='w', newline='') as file:
writer = csv.writer(file)
writer.writerow(csv_headers)
initialize_gps()
print("Starting continuous GPS tracking. Press Ctrl+C to stop.")
while running:
get_gps_position()
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time.sleep(14) # Wait for 10 seconds before the next reading
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ser.close()
GPIO.cleanup()
print("GPS tracking stopped. Goodbye!")