Serial data logging using Arduino and pySerial

Question

I have a temperature sensor ( LM35 ) interfaced with an Arduino board and my sketch is able to log values to the serial port, say /dev/ttyACM0 in Ubuntu, and I was able to install pySerial and log the temperature values into a file... I used the command

python -m serial.tools.miniterm /dev/ttyACM0 >> templogger.csv

So it will log values like

27
28
27

into the templogger.csv file.

My requirement is to log the system time also along with this, that is, like

Tue Jun 11 18:42:37 IST 2013,27
Tue Jun 11 18:42:38 IST 2013,28
Tue Jun 11 18:42:39 IST 2013,27

and then possibly plot these values stored in the CSV file to an Android client. How should I proceed? What would be a script to log time and temperature together?

Answer 1

Save following script as 'with_time.py':

import sys
import time
import subprocess

p = subprocess.Popen(sys.argv[1:], stdout=subprocess.PIPE, bufsize=-1)
# for line in sys.stdin: # This cause buffering!
while True:
    line = p.stdout.readline()
    if not line:
        break
    line = time.ctime() + ',' + line
    sys.stdout.write(line)
p.wait()

and run following command:

python with_time.py python -u -m serial.tools.miniterm /dev/ttyACM0 >> templogger.csv

Answer 2

尝试qcsvlog-它直接从串行端口绘制图表： https ： //github.com/ncp1402/qcsvlog