143 lines
4.2 KiB
Python
143 lines
4.2 KiB
Python
#!/usr/bin/python
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# -*- coding:utf-8 -*-
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import RPi.GPIO as GPIO
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import serial
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import time
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from datetime import datetime
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import os
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import csv
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import signal
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import sys
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# GPIO configuration
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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ser = serial.Serial('/dev/ttyUSB3', 115200)
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ser.flushInput()
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myhost = os.uname()[1]
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# CSV file settings
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csv_filename = f"gps_data_{myhost}.csv"
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csv_headers = ["Timestamp", "Latitude", "Longitude", "Date", "Time", "Altitude", "Speed"]
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# Global flag for graceful exit
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running = True
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def signal_handler(sig, frame):
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global running
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print('You pressed Ctrl+C! Stopping GPS tracking...')
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running = False
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signal.signal(signal.SIGINT, signal_handler)
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def parse_gps_data(gps_string):
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parts = gps_string.split(',')
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if len(parts) < 8 or all(part == '' for part in parts):
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return None
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try:
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lat = float(parts[0][:2]) + float(parts[0][2:]) / 60
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if parts[1] == 'S':
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lat = -lat
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lon = float(parts[2][:3]) + float(parts[2][3:]) / 60
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if parts[3] == 'W':
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lon = -lon
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date = parts[4]
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gps_time = parts[5]
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altitude = parts[6]
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speed = parts[7]
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return f"{lat:.6f}", f"{lon:.6f}", date, gps_time, altitude, speed
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except ValueError as e:
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print(f"Error parsing GPS data: {e}")
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return None
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def write_to_csv(lat, lon, date, gps_time, altitude, speed):
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timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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with open(csv_filename, mode='a', newline='') as file:
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writer = csv.writer(file)
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writer.writerow([timestamp, lat, lon, date, gps_time, altitude, speed])
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def send_at(command, back, timeout):
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print(f"Sending command: {command}")
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ser.write((command + '\r\n').encode())
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time.sleep(timeout)
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if ser.inWaiting():
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time.sleep(0.01)
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rec_buff = ser.read(ser.inWaiting()).decode()
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print(f"Received data: {rec_buff}")
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if back not in rec_buff:
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print(command + ' ERROR')
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print(command + ' back:\t' + rec_buff)
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return 0
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else:
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try:
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gps_data = rec_buff.split('+CGPSINFO: ')[1].split('\r\n')[0]
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print(f"Extracted GPS data: {gps_data}")
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parsed_data = parse_gps_data(gps_data)
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if parsed_data:
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lat, lon, date, gps_time, altitude, speed = parsed_data
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print(f"Parsed GPS data: Lat: {lat}, Lon: {lon}, Date: {date}, Time: {gps_time}, Altitude: {altitude}, Speed: {speed}")
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write_to_csv(lat, lon, date, gps_time, altitude, speed)
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return 1
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else:
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print("No valid GPS data found in this response")
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return 0
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except IndexError:
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print("Unexpected response format")
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return 0
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else:
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print('No data received from GPS')
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return 0
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def get_gps_position():
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answer = send_at('AT+CGPSINFO', '+CGPSINFO:', 1)
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if answer == 1:
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print("Valid GPS data received and processed")
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else:
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print('Waiting for GPS fix...')
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def initialize_gps():
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print('Starting GPS')
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send_at('AT+CGPS=1,1', 'OK', 1)
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time.sleep(2)
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attempts = 0
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max_attempts = 10
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while attempts < max_attempts:
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print(f"Initialization attempt {attempts + 1} of {max_attempts}")
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if get_gps_position() == 1:
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print("GPS initialized successfully")
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return True
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attempts += 1
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time.sleep(2)
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print("Failed to initialize GPS after maximum attempts")
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return False
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# Create CSV file with headers if it doesn't exist
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if not os.path.exists(csv_filename):
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with open(csv_filename, mode='w', newline='') as file:
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writer = csv.writer(file)
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writer.writerow(csv_headers)
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try:
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if initialize_gps():
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print("Starting continuous GPS tracking. Press Ctrl+C to stop.")
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while running:
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get_gps_position()
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time.sleep(10) # Wait for 10 seconds before the next reading
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else:
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print("GPS initialization failed. Exiting.")
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except Exception as e:
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print(f"Error: {e}")
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finally:
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if ser:
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ser.close()
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GPIO.cleanup()
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print("GPS tracking stopped. Goodbye!")
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