111 lines
3.1 KiB
Python
111 lines
3.1 KiB
Python
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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# GPIO configuration
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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# Initialize serial port
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try:
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ser = serial.Serial('/dev/ttyUSB3', 9600)
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ser.flushInput()
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except serial.SerialException as e:
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print(f"Error initializing serial port: {e}")
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exit(1)
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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"]
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# Global flag for graceful exit
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running = True
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# List to store pending data
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pending_data = []
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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) < 4:
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return None
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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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return f"{lat:.6f}", f"{lon:.6f}"
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def write_to_csv(data):
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file_exists = os.path.isfile(csv_filename)
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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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if not file_exists:
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writer.writerow(csv_headers)
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writer.writerow(data)
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def send_data(command, back, timeout):
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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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if back in rec_buff:
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gps_data = rec_buff.split('+CGPSINFO: ')[1].split('\r\n')[0]
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parsed_data = parse_gps_data(gps_data)
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if parsed_data:
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lat, lon = parsed_data
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print(f"GPS: Lat: {lat}, Lon: {lon}")
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write_to_csv(lat, lon)
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return 1
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return 0
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def main():
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while running:
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try:
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if ser.in_waiting > 0:
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gps_data = ser.readline().decode('utf-8').strip()
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parsed_data = parse_gps_data(gps_data)
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if parsed_data:
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timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
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latitude, longitude = parsed_data
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data = [timestamp, latitude, longitude]
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write_to_csv(data)
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pending_data.append(data)
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print(f"Logged data: {timestamp}, {latitude}, {longitude}")
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# Try to send pending data
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for data in pending_data:
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try:
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send_data(data)
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pending_data.remove(data)
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except Exception as e:
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print(f"Error sending data: {e}")
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break # Exit loop if sending fails
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time.sleep(1)
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except Exception as e:
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print(f"Error during GPS tracking: {e}")
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ser.close()
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GPIO.cleanup()
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print("Program terminated gracefully")
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if __name__ == "__main__":
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main() |