import numpy as np

import matplotlib.pyplot as plt
import fft
import IIR_filter

class zerocross_meas(object):
	"""docstring for fft_meas"""
	def __init__(self):
		
		# Old value
		self.y_old = 0

		# Zerocross flag
		self.flag = False


	def detect(self, y):

		self.flag = 0

		# If positive zerocross is detected
		if self.y_old < 0 and y > 0:
			self.flag = True

		self.y_old = y


			
	def print(self):
		print(self.freq)