Reputation: 43
I have a file, which I am writing data to, however I would like the naming convention to have the time, the file was created at and then stream to the same file for one hour before creating a new text file.
My problem is that I am using a while loop to create the text file while reading from a GPIO and so when the code runs, it creates a new text file every time it moves through the loop. How can I create the file, then write to the existing file for a predetermined amount of time?
import spidev
import time
import datetime
import os
spi = spidev.SpiDev()
spi.open(0,0) #open port 0 of the SPI
count = 0
def timeStamp(fname, fmt ='%Y-%m-%d-%H-%M-%S_{fname}'):
#this function adds the time and date
return datetime.datetime.now().strftime(fmt).format(fname = fname)
def alarm_check(int):
#this function checks the value read in by the SPI
#creating an alarm if the value is 0
if int == 0:
return ("System Alarm!")
else:
return ("System OK")
def write_to_file(int):
# this function will write the current value to a file,
# the time it was read in
# and if the system was im alarm
with open (('SPI_Input_Values'), 'a') as output:
output.write("Input = " + str(int) + '\t' + timeStamp('ADC') + '\t\t' + str(alarm_check(int)) + '\n')
def readadc(adcnum):
#this function will open the SPI and read it to see the current value
# this will then be written to a text value
# using the write_to_file function
if adcnum > 7 or adcnum < 0:
return -1
r = spi.xfer2([1,8 + adcnum << 4,0])
adcout = ((r[1] & 3) << 8) + r[2]
return adcout
while True:
Inp1 = int(round(readadc(0)/10.24)) # defines Inp1 as an integer to be read in
write_to_file(Inp1)
count = count +1
time.sleep(0.1) # puts the systemm to sleep for 0.1 seconds
Upvotes: 0
Views: 168
Reputation: 59681
You need to dynamically create your filename. At the moment it was a hardcoded string. Here's an example:
fname = 'SPI_Input_Values'
fmt ='%Y-%m-%d-%H'
date_str = datetime.datetime.now().strftime(fmt)
file_name = date_str + "_" + fname
with open ((file_name, 'a') as output:
output.write("Input = " + str(int) + '\t' + timeStamp('ADC') + '\t\t' + str(alarm_check(int)) + '\n')
This will constantly append to the file that represents the current hour. When the next hour begins, it will automatically create a new file and begin appending data to it instead.
Upvotes: 1
Reputation: 14975
Something like:
def write_to_file(output, int):
output.write("Input = " + str(int) + '\t' + timeStamp('ADC') + '\t\t' + str(alarm_check(int)) + '\n')
with open (('SPI_Input_Values'), 'a') as output:
while True:
Inp1 = int(round(readadc(0)/10.24)) # defines Inp1 as an integer to be read in
write_to_file(output, Inp1)
count = count +1
time.sleep(0.1)
Upvotes: 1