GRIMM 1.109 data logging interface

read_grimm.py

#!/usr/bin/python
# GRIMM data collection script
# Ben Fasoli

import serial as ser                   # serial port use
import datetime                        # time stamps (UTC)
import re                              # regular expression matching

# Path to serial device ID
serialpath = '/dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0'
# Path for output csv files, ending in /
outpath = '/home/pi/data/'
# Serial baud rate
baud = 9600

print('GRIMM data logger initializing')
print('Contact Ben Fasoli with issues\n')

# Initialize serial device
s = ser.Serial(serialpath, baud)

try:
    while True:
        # Initialize buffer
        buf = ['']
        while not buf[0].startswith('C'):
            buf = [s.readline()]
            tc = datetime.datetime.utcnow()

        # Read three additional records
        buf = buf + [s.readline() for x in range(3)]

        # Coerce buffer to single line
        buf = ' '.join(buf)
        buf = buf.replace('\r', '').replace('\n', ' ')
        buf = re.sub('C.:|c.:|C.;|c.;', '', buf)
        buf = re.sub('\s+', ',', buf)
        if buf.endswith(','): buf = buf[0:-1]
        buf = str(tc) + buf + '\n'

        # Save to file
        print(buf)
        filename = outpath + tc.strftime('%Y-%m-%d.csv')
        with open(filename, 'a+') as f:
            f.write(buf)

except (KeyboardInterrupt, SystemExit):
    s.flush()
    s.close()
    print('\n\nClosed successfully.\n\n')

watch.sh

#!/bin/bash

if ! /usr/bin/screen -ls | /bin/grep -q log; then
  /usr/bin/screen -S logging -dm /home/pi/log.py
fi