jdz/gps06.py

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Python
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2024-07-22 02:49:33 +00:00
#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time
import os
import csv
from datetime import datetime
myhost = os.uname()[1]
# GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
gpio_initialized = False
ser = serial.Serial('/dev/ttyS0', 115200)
ser.flushInput()
rec_buff = ''
time_count = 0
# CSV file setup
csv_filename = 'gps_coordinates.csv'
csv_header = ['Timestamp', 'Latitude', 'Longitude']
def write_to_csv(lat, lon):
timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
with open(csv_filename, 'a', newline='') as csvfile:
csv_writer = csv.writer(csvfile)
if os.stat(csv_filename).st_size == 0:
csv_writer.writerow(csv_header)
csv_writer.writerow([timestamp, lat, lon])
def parse_gps_data(gps_data):
parts = gps_data.split(',')
if len(parts) >= 4:
lat = convert_to_decimal(parts[0], parts[1])
lon = convert_to_decimal(parts[2], parts[3])
return lat, lon
return None, None
def convert_to_decimal(coord, direction):
degrees = float(coord[:2])
minutes = float(coord[2:])
decimal = degrees + (minutes / 60)
if direction in ['S', 'W']:
decimal = -decimal
return round(decimal, 6)
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(gps_data)
lat, lon = parse_gps_data(gps_data)
if lat is not None and lon is not None:
write_to_csv(lat, lon)
return 1
else:
print('GPS is not ready')
return 0
def get_gps_position():
rec_null = True
answer = 0
print('Starting GPS')
rec_buff = ''
send_at('AT+CGPS=1,1','OK',1)
time.sleep(2)
while rec_null:
answer = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
if 1 == answer:
answer = 0
if ',,,,,,' in rec_buff:
print('GPS is not ready')
rec_null = False
time.sleep(1)
else:
print('error %d'%answer)
rec_buff = ''
send_at('AT+CGPS=0','OK',1)
return False
time.sleep(1.5)
def power_on(power_key):
print('SIM7600X is starting:')
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(power_key,GPIO.OUT)
time.sleep(0.1)
GPIO.output(power_key,GPIO.HIGH)
time.sleep(2)
GPIO.output(power_key,GPIO.LOW)
time.sleep(20)
ser.flushInput()
print('SIM7600X is ready')
def power_down(power_key):
print('SIM7600X is logging off:')
GPIO.output(power_key,GPIO.HIGH)
time.sleep(3)
GPIO.output(power_key,GPIO.LOW)
time.sleep(18)
print('Good bye')
try:
#power_on(power_key)
get_gps_position()
#power_down(power_key)
except:
if ser != None:
ser.close()
#power_down(power_key)
GPIO.cleanup()
if ser != None:
ser.close()
GPIO.cleanup()