# Example of logging data to a CSV file

import time
import random

# Open the file for writing
f = open("data.csv", "a")

# Write the CSV header (the names of the columns)
# You should add/rename the columns as appropriate
f.write("time,value\n")

# Log 10 data points
# You can replace this with whatever you want, or use while(True) to log until
# you halt the program or power down the ESP32.
for i in range(10):
  # Read some data (from whatever source you want)
  # For this example, we'll just make up a random number:
  data = random.random()

  # Grab the current time (in seconds)
  # If you need more resolution, you could use time.ticks_ms() instead
  current_time = time.time()

  # Write the data 
  # Remember that the format() function replaces each {} with the corresponding value
  f.write("{},{}\n".format(current_time, data))

  time.sleep(1)

# Clean up!
f.close()