129 lines
3.2 KiB
Python
129 lines
3.2 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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import os
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import csv
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from datetime import datetime
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myhost = os.uname()[1]
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# GPIO setup
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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gpio_initialized = False
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ser = serial.Serial('/dev/ttyS0', 115200)
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ser.flushInput()
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rec_buff = ''
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time_count = 0
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# CSV file setup
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csv_filename = 'gps_coordinates.csv'
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csv_header = ['Timestamp', 'Latitude', 'Longitude']
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def write_to_csv(lat, lon):
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timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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with open(csv_filename, 'a', newline='') as csvfile:
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csv_writer = csv.writer(csvfile)
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if os.stat(csv_filename).st_size == 0:
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csv_writer.writerow(csv_header)
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csv_writer.writerow([timestamp, lat, lon])
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def parse_gps_data(gps_data):
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parts = gps_data.split(',')
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if len(parts) >= 4:
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lat = convert_to_decimal(parts[0], parts[1])
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lon = convert_to_decimal(parts[2], parts[3])
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return lat, lon
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return None, None
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def convert_to_decimal(coord, direction):
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degrees = float(coord[:2])
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minutes = float(coord[2:])
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decimal = degrees + (minutes / 60)
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if direction in ['S', 'W']:
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decimal = -decimal
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return round(decimal, 6)
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def send_at(command, back, timeout):
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rec_buff = ''
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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())
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if rec_buff != '':
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if back not in rec_buff.decode():
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print(command + ' ERROR')
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print(command + ' back:\t' + rec_buff.decode())
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return 0
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else:
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gps_data = rec_buff.decode()[13:-36]
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print(gps_data)
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lat, lon = parse_gps_data(gps_data)
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if lat is not None and lon is not None:
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write_to_csv(lat, lon)
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return 1
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else:
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print('GPS is not ready')
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return 0
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def get_gps_position():
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rec_null = True
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answer = 0
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print('Starting GPS')
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rec_buff = ''
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send_at('AT+CGPS=1,1','OK',1)
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time.sleep(2)
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while rec_null:
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answer = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
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if 1 == answer:
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answer = 0
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if ',,,,,,' in rec_buff:
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print('GPS is not ready')
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rec_null = False
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time.sleep(1)
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else:
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print('error %d'%answer)
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rec_buff = ''
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send_at('AT+CGPS=0','OK',1)
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return False
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time.sleep(1.5)
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def power_on(power_key):
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print('SIM7600X is starting:')
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(power_key,GPIO.OUT)
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time.sleep(0.1)
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GPIO.output(power_key,GPIO.HIGH)
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time.sleep(2)
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GPIO.output(power_key,GPIO.LOW)
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time.sleep(20)
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ser.flushInput()
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print('SIM7600X is ready')
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def power_down(power_key):
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print('SIM7600X is logging off:')
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GPIO.output(power_key,GPIO.HIGH)
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time.sleep(3)
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GPIO.output(power_key,GPIO.LOW)
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time.sleep(18)
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print('Good bye')
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try:
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#power_on(power_key)
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get_gps_position()
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#power_down(power_key)
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except:
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if ser != None:
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ser.close()
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#power_down(power_key)
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GPIO.cleanup()
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if ser != None:
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ser.close()
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GPIO.cleanup()
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