main.py

from adafruit_extended_bus import ExtendedI2C as I2C
import adafruit_vl53l0x
import BlynkLib
#import tm1637
import time
import board
import array as arr

# Constant and variable
DIST_THRESHOLD = 1600
Pathway = arr.array('i', [0, 0, 0, 0])
PreviousPathway = 1
count = 0
i = 0

# initialize display
#tm = tm1637.TM1637(clk=15, dio=14)
#tm.number(count)

# initialize Blynk
blynk = BlynkLib.Blynk('1uydc31qPohfeZzvCqASEktOBc0E9CRK')

# initialize sensor
vl53_1 = adafruit_vl53l0x.VL53L0X(I2C(2))
vl53_2 = adafruit_vl53l0x.VL53L0X(I2C(1))

while True:
    blynk.run()

    # read sensor
    sensor_1 = vl53_1.range
    sensor_2 = vl53_2.range

    # send sensor range to cloud
    #blynk.virtual_write(1, sensor_1)
    #blynk.virtual_write(2, sensor_2)

    #print('i', i)

    # direction algorithm
    if sensor_1 < DIST_THRESHOLD and sensor_2 < DIST_THRESHOLD:
        Pathway[i] = 3
        if Pathway[i] != Pathway[i-1]:
            if i < 4:
                i += 1
    elif sensor_2 < DIST_THRESHOLD:
        Pathway[i] = 2
        if Pathway[i] != Pathway[i-1]:
            if i < 4:
                i += 1
    elif sensor_1 < DIST_THRESHOLD:
        Pathway[i] = 1
        if Pathway[i] != Pathway[i-1]:
            if i < 4:
                i += 1
    else:
        if i > 2:
            if Pathway[0] == 1 and Pathway[1] == 3 and Pathway[2] == 2:
                count += 1
                #tm.number(count)
                if count < 1:
                    blynk.virtual_write(1, 'not available')
                    count = 0
                elif count == 1:
                    blynk.virtual_write(1, 'available')
                else:
                    blynk.virtual_write(1, 'with other student')
                blynk.virtual_write(3, count)
                #blynk.virtual_write(4, 'IN')
                Pathway = arr.array('i', [0, 0, 0, 0, 0])
            elif Pathway[0] == 2 and Pathway[1] == 3 and Pathway[2] == 1:
                count -= 1
                #tm.number(count)
                if count < 1:
                    blynk.virtual_write(1, 'not available')
                    count = 0
                elif count == 1:
                    blynk.virtual_write(1, 'available')
                else:
                    blynk.virtual_write(1, 'with other student')
                blynk.virtual_write(3, count)
                #blynk.virtual_write(4, 'OUT')
                Pathway = arr.array('i', [0, 0, 0, 0, 0])
        i = 0

    #print(Pathway[0], Pathway[1], Pathway[2])
    #print('i', i)