I am using a script that takes the arduino serial and writes it to an out.dat file. The scripts works fine when run after boot, however when I added the script to /etc/rc.local it runs the script, but does not record the information
#!/usr/bin/python
# get lines of text from serial port, save them to a file
from __future__ import print_function
import serial, io
import datetime
addr = '/dev/ttyACM0' # serial port to read data from
baud = 9600 # baud rate for serial port
fname = 'gps-log'+datetime.datetime.now().strftime("%m-%d-%Y %H-%M-%S")+'.dat' # log file to save data in
fmode = 'a' # log file mode = append
with serial.Serial(addr,9600) as pt, open(fname,fmode) as outf:
spb = io.TextIOWrapper(io.BufferedRWPair(pt,pt,1),
encoding='ascii', errors='ignore', newline='\r',line_buffering=True)
spb.readline() # throw away first line; likely to start mid-sentence (incomplete)
while (1):
x = spb.readline() # read one line of text from serial port
print (x,end='') # echo line of text on-screen
outf.write(x) # write line of text to file
outf.flush() # make sure it actually gets written out
Credit to https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=64545
Note, it is supposed to create a new file named after the date and time. When I boot to command line, it prints the serial, so I know the program has executed. However, when I power down there is no .dat file to be found.
