jdz/gps001.py
2024-07-24 19:39:15 -06:00

119 lines
3.1 KiB
Python
Executable File

#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time
import os
import csv
from datetime import datetime
# GPIO configuration
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
ser = serial.Serial('/dev/ttyUSB3', 115200)
ser.flushInput()
rec_buff = ''
time_count = 0
myhost = os.uname()[1]
# CSV file settings
csv_filename = f"gps_data_{myhost}.csv"
csv_headers = ["Timestamp", "Latitude", "Longitude"]
def convert_to_decimal(coord_str):
coord = coord_str[:-2]
direction = coord_str[-1]
degrees = float(coord[:2] if direction in ['N', 'S'] else coord[:3])
minutes = float(coord[2:] if direction in ['N', 'S'] else coord[3:])
decimal = degrees + (minutes / 60)
if direction in ['S', 'W']:
decimal = -decimal
return decimal
def parse_gps_data(gps_string):
parts = gps_string.split(',')
if len(parts) != 4:
return "Invalid GPS data"
lat = convert_to_decimal(parts[0] + ',' + parts[1])
lon = convert_to_decimal(parts[2] + ',' + parts[3])
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])
time.sleep(12)
def send_at(command, back, timeout):
rec_buff = ''
ser.write((command + '\r\n').encode())
time.sleep(timeout)
if ser.inWaiting():
time.sleep(0.01)
rec_buff = ser.read(ser.inWaiting())
if rec_buff:
if back not in rec_buff.decode():
print(command + ' ERROR')
print(command + ' back:\t' + rec_buff.decode())
return 0
else:
gps_data = rec_buff.decode()[13:-36]
print("Raw GPS data:", gps_data)
lat, lon = parse_gps_data(gps_data)
converted_gps = f"{lat}, {lon}"
print("Converted GPS data for Google Maps:", converted_gps)
current_time = datetime.now()
write_to_csv(lat, lon)
return 1
else:
print('GPS no está listo')
return 0
def get_gps_position():
rec_null = True
answer = 0
print('Iniciando GPS')
rec_buff = ''
send_at('AT+CGPS=1,1', 'OK', 1)
time.sleep(2)
while rec_null:
answer = send_at('AT+CGPSINFO', '+CGPSINFO: ', 1)
# Handle MQTT publishing here if needed
if answer == 1:
if ',,,,,,' in rec_buff:
print('GPS no está listo')
rec_null = False
time.sleep(1)
else:
print(f'Error {answer}')
rec_buff = ''
send_at('AT+CGPS=0', 'OK', 1)
return False
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)
try:
get_gps_position()
except Exception as e:
print(f"Error: {e}")
finally:
if ser:
ser.close()
GPIO.cleanup()