Excercise1

from gpiozero import LED , DistanceSensor
from time import sleep

sensor = DistanceSensor(echo=18, trigger=17)

RLED = LED(16)
YLED = LED(14)
GLED = LED(15)

State = "Idle"

def get_distance():
    cm = sensor.distance * 100
    return cm

while True:
    if State == "Idle":
        RLED.off()
        GLED.off()
        YLED.off()
        d=get_distance()
        if d>5 and d<15:
            State = "Close"
            print("Close1")
        if d>25 and d<30:
            State = "Far"
            print("Far1")
        if d>15 and d<25:
            State = "Near"
            print("Near1")
    elif State == "Close":
        RLED.on()
        GLED.on()
        YLED.on()
        d=get_distance()
        if d>30:
            State = "Idle"
            print("Idle2")
        if d>15 and d<25:
            State = "Near"
            print("Near2")
        if d>25 and d<30:
            State = "Far"
            print("Far2")

    elif State == "Near":
        RLED.off()
        GLED.on()
        YLED.on()
        d=get_distance()
        if d>30:
            State = "Idle"
            print("Idle3")
        if d>5 and d<15:
            State = "Close"
            print("Close3")
        if d>15 and d<25:
            State = "Far"
            print("Far3")

    elif State == "Far":
        RLED.off()
        GLED.off()
        YLED.on()
        d=get_distance()
        if d>30:
            State = "Idle"
            print("Idle4")
        if d>5 and d<15:
            State = "Close"
            print("Close4")
        if d>15 and d<25:
            State = "Near"
            print("Near4")