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executable file 54 lines (39 sloc) 917 Bytes
#!/usr/bin/python
import sys
import os
import datetime
import time
import serial
base = "/usr/local/data/solar"
ser = serial.Serial('/dev/ttyUSB0', 9600)
last_wh = None
last_m = None
last_path = None
f = None
while True:
line = ser.readline()
try:
wh = int(line, 10)
except ValueError:
time.sleep(0.5)
continue
if wh == last_wh:
continue
now = datetime.datetime.now()
if now.minute == last_m:
continue
dirname = os.path.join(base, str(now.year), "%02d" % now.month)
if not os.path.exists(dirname):
os.makedirs(dirname)
path = os.path.join(dirname, "%02d.log" % now.day)
if path != last_path:
if not f is None:
f.close()
f = open(path, "a+")
last_path = path
fmt = "%H:%M:%S"
print >> f, now.strftime(fmt), wh
f.flush()
last_wh = wh
last_m = now.minute
# FIN