Python Ankle biter

During our python unit, our final goal was to learn how to use python for robotics. Our idea was to make a robot that when picking up specific distances on an ultrasonic sensor it would drive full force into whatever was the shortlist distance. The issues we ran into while making this were, the wiring was messed up multiple times causing issues with the motors spinning without any code running. Our code had a bug where it would constantly turn one wheel at one speed no matter what input was given, causing it to turn left or right. This was a very enjoyable project and it was all very new to me, wiring and robotics.

#Libraries
import RPi.GPIO as GPIO
import time
 
#GPIO Mode (BOARD / BCM)
GPIO.setmode(GPIO.BCM)
 
#set GPIO Pins
GPIO_TRIGGER = 18
GPIO_ECHO = 24
 
#set GPIO direction (IN / OUT)
GPIO.setup(GPIO_TRIGGER, GPIO.OUT)
GPIO.setup(GPIO_ECHO, GPIO.IN)

in1 = 24
in2 = 23
en = 25
temp1=1

GPIO.setmode(GPIO.BCM)
GPIO.setup(in1,GPIO.OUT)
GPIO.setup(in2,GPIO.OUT)
GPIO.setup(en,GPIO.OUT)
GPIO.output(in1,GPIO.LOW)
GPIO.output(in2,GPIO.LOW)
p=GPIO.PWM(en,1000)
p.start(25)
print("\n")
print("The default speed & direction of motor is LOW & Forward.....")
print("r-run s-stop f-forward b-backward l-low m-medium h-high e-exit")
print("\n")    

while(1):

    x=raw_input()
   
def run():
        if x=='r':
        print("run")
        if(temp1==1):
         GPIO.output(in1,GPIO.HIGH)
         GPIO.output(in2,GPIO.LOW)
         print("forward")
         x='z'
        else:
         GPIO.output(in1,GPIO.LOW)
         GPIO.output(in2,GPIO.HIGH)
         print("backward")
         x='z'

def stop():
    x=='s':
        print("stop")
        GPIO.output(in1,GPIO.LOW)
        GPIO.output(in2,GPIO.LOW)
        x='z'

def forward():
     x=='f':
        print("forward")
        GPIO.output(in1,GPIO.HIGH)
        GPIO.output(in2,GPIO.LOW)
        temp1=1
        x='z'

def backward():
    x=='b':
        print("backward")
        GPIO.output(in1,GPIO.LOW)
        GPIO.output(in2,GPIO.HIGH)
        temp1=0
        x='z'

def low():
     x=='l':
        print("low")
        p.ChangeDutyCycle(25)
        x='z'

def med():
    x=='m':
        print("medium")
        p.ChangeDutyCycle(50)
        x='z'

def high():
    x=='h':
        print("high")
        p.ChangeDutyCycle(75)
        x='z'
     
   
def car_break():
   
   

def distance():
    # set Trigger to HIGH
    GPIO.output(GPIO_TRIGGER, True)
 
    # set Trigger after 0.01ms to LOW
    time.sleep(0.00001)
    GPIO.output(GPIO_TRIGGER, False)
 
    StartTime = time.time()
    StopTime = time.time()
 
    # save StartTime
    while GPIO.input(GPIO_ECHO) == 0:
        StartTime = time.time()
 
    # save time of arrival
    while GPIO.input(GPIO_ECHO) == 1:
        StopTime = time.time()
 
    # time difference between start and arrival
    TimeElapsed = StopTime - StartTime
    # multiply with the sonic speed (34300 cm/s)
    # and divide by 2, because there and back
    distance = (TimeElapsed * 34300) / 2
 
    return distance
 
if __name__ == '__main__':
    try:
        while True:
            dist = distance()
            print ("Measured Distance = %.1f cm" % dist)
            time.sleep(.25)
 
        # Reset by pressing CTRL + C
    except KeyboardInterrupt:
        print("Measurement stopped by User")
        GPIO.cleanup()