uart.py

   1 #!/usr/bin/env python3
   2 import serial, time
   3
   4 ser=serial.Serial('/dev/ttyACM0', 9600,timeout=.5) # serial connection
   5
   6 logFile=open('lightLog.txt','w') # open and write to lightLog.txt
   7
   8 while True:
   9     now = time.localtime() # year[0], month[1], day[2], hour[3], minute[4], second[5], weekday[6], yearday[7]
  10     timestamp=(str(now[3])+":"+str(now[4])+":"+str(now[5])+" "+str((now[1]))+"/"+str(now[2])+"/"+str(now[0]))
  11     if int(now[3]) == 7: # if hour is 7 am or greater, STOP collecting data
  12         logFile.close()
  13         exit() # no error message, or breaks crontab
  14     else:
  15         data=ser.readline()
  16         light=str(data).encode("utf-8")
  17         a=light.strip(b"b'") # remove beginning empty space
  18         Light=int(float(a[:-4])) # remove last 4 bits, leaving only float->int of light_val
  19         logFile.write("Ambient Light: "+str(Light)+" "+timestamp+"\n")
  20         logFile.flush()
  21         print((Light),timestamp)
  22         time.sleep(60) # how often to sample data line