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OneWaySystem.py
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OneWaySystem.py
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import statistics
from gpiozero import Buzzer
from time import sleep
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
import csv
from gpiozero import Buzzer
buzzer = Buzzer(21)
TRIG = 18 #When we say TRIG, we mean 18. Makes the code easier to understand.
ECHO = 24 #When we say ECHO, we mean 24. Makes the code easier to understand.
print ("Distance Measurement In Progress")
GPIO.setup(TRIG,GPIO.OUT) #sets up TRIG (that's PIN 23) to an outout for the speaker to trigger sending a PING!
GPIO.setup(ECHO,GPIO.IN) #sets up ECHO (that's PIN 23) to an input microphone to listen for the echo PONG back.
GPIO.output(TRIG, False) #Makes sure the Trigger speaker isn't sending out anything and is quiet to start.
print ("Waiting For Sensor To Settle")
def distcheck(): #defines a neat function to gather up all the code needed for one single distance measurement.
GPIO.output(TRIG, True) #fires a pulse by setting the trigger speaker to high
time.sleep(0.00001) #wait's a fraction of a second, it's a very short pulse!!!!
GPIO.output(TRIG, False) #turns the trigger speaker off again.
while GPIO.input(ECHO)==0: #measure some times
pulse_start = time.time() #records the time the pulse was sent
while GPIO.input(ECHO)==1: #records the time the echo was heard
pulse_end = time.time()
pulse_duration = pulse_end - pulse_start #finds the differnce between sent and recieved pulses
distance = pulse_duration * 17150 #multiply by a fudge factor to convert to seconds
distance = round(distance, 2) #rounds off the number
#print ("Distance:",distance,"cm") #prints it
return distance
######## Start of program #########
while True:
lister = []
for x in range(20):
lister.append(round(distcheck(),-1))
print(lister)
moe = statistics.median(lister)
zap1 = moe
print("First distance is ",zap1)#printsmoe
time.sleep(1)
lister2 = []
for x in range(20):
lister.append(round(distcheck(),-1))
print(lister2)
moe2 = statistics.median(lister)
zap2 = moe2
print("Second distance is ",zap2)
if zap1 < zap2:
print("getting further away")
buzzer.on()
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(4,GPIO.OUT)
GPIO.output(4,GPIO.HIGH)
sleep(5)
buzzer.off()
GPIO.output(4,GPIO.LOW)
sleep(2)