# TestRainGuage04.py

#!/usr/bin/python
import RPi.GPIO as GPIO
import time

# this many mm per bucket tip
CALIBRATION = 0.2794
# which GPIO pin the gauge is connected to
PIN = 22
# file to log rainfall data in
LOGFILE = "log.csv"

GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# variable to keep track of how much rain
rain = 0


# the call back function for each bucket tip
def cb(channel):
    global rain
    rain = rain + CALIBRATION


def average_column(csv):
    f = open(csv, "r")
    average = 0
    Sum = 0
    row_count = 0
    for row in f:
        for column in row.split(','):
            n = float(column)
            Sum += n
        row_count += 1
    average = Sum / len(column)
    f.close()
    return 'The average is:', average


# register the call back for pin interrupts
GPIO.add_event_detect(PIN, GPIO.FALLING, callback=cb, bouncetime=300)

# open the log file
file = open(LOGFILE, "a")

# display and log results
while True:
    line = "%i, %f" % (time.time(), rain)
    if rain > 0:
        print(line)
        file.write(line + "\n")
        file.flush()

    rain = 0
    time.sleep(20)

# close the log file and exit nicely
file.close()
GPIO.cleanup()