#!/usr/bin/env python
# -*- coding: utf-8 -*-

import u12
import time
from threading import Lock
import os
import numpy
import ctypes

threadLock = Lock() 
lj = u12.U12()

def distance():
    numscans = 500
    Voltages = [ [0] * 4095 for row in range(4)]
    stateIOout = [ [0] * 4095]

    threadLock.acquire()
    lj.eDigitalOut(idNum = -1, channel = 0, writeD = 0, state = 0)
    time.sleep(0.1)
    lj.eDigitalOut(idNum = -1, channel = 0, writeD = 0, state = 1)
    threadLock.release()

    print(lj.aiBurst(idNum = -1, updateIO = 1, ledOn = 1, numChannels = 1,
                       channels = [0, 0, 0, 0], scanRate = 8192, numScans = numscans))

    counter = 0
    for x in range(0, (numscans-1)):
        if Voltages[x][0] > 1:
            counter = counter + 1

    Pulse_time = 1 / scanrate * Counter
    Scale_val = (Pulse_time - 0.0001) / 0.0179
    distanz = (2.97 * Scale_val + 0.03)/100
        
    return distance
 
if __name__ == '__main__':
    try:
        while True:
            distance_cm = distance()
            print ("Distance = %.1f cm" % distance_cm)
            time.sleep(1)
    except KeyboardInterrupt:
        print("Measuring stopped")