Execution $4$:

Enter the integer:

$0$ for Red Led, $1$ for Yellow, $2$ for Green Led: $5$

Wrong Led Selection: Try again

Enter $0$ to exit or $1$ to continue: $1$

Enter the integer:

$)$ for Red Led, $1$ for Yellow, $2$ for Green Led: $3$

Wrong Led Selection: Try again

Enter $0$ to exit or $1$ to continue: $0$

End of Execution

Implement code in the provided template Python file to reflect the execution of the

instructor's completed Python script

Coding Architecture Rules:

a$.$ Read the comments provided in the template to implement code

b$.$ You have to implement the code based on the provided comments.

c$.$ You cannot change any code in the provided template file

d$.$ A variable name specified to be used in coding in a comment cannot be changed

e$.$ You cannot change the script flow provided in the template file.

f$.$ Any violations of the architecture rules will result in penalties, and if the violations

are significant, a zero grade will be assigned"""

A Program to turn on an user chosen LED in the Traffic Light,

and allow the user to select different leds repeatdely and

decide when to exit the program

$"""$

#Import the library RPi.GPIO with alias GPIO

import RPi.GPIO as GPIO

#Import the sleep function from time module

from time import sleep

$"""$Setting the pin access mode to BCM$"""$

GPIO.setmode$($GPIO$.$BCM$)$

$"""$Define a list collection type named leds and initialize

with the three GPIO pin numbers in broadcom mode to $6,13$ and $26$

corresponding to red, yellow and green leds connected

Points: $2"""$

$"""$Setup the three GPIO pins to be output pins

using the list variable leds

Points: $2"""$

$"""$A boolean varible initialized to be used as the sentinel in the while loop"""

flag$\_$cont $=$ True

$"""$A While loop to execute continously until the user

decides to exit"""

while$($flag$\_$cont$)$:

$"""$Write code to prompt the user to select either

red or yellow or green led by entering

$0$ for Red Led

$1$ for Yellow Led

$2$ for Green Led.

Store the user entered integer in a variable named led$\_$idx

Points: $2$

$"""$

print$(\text{'}$Enter the integer:$\text{'})$

$"""$Write conditional statements $($if$,$ elif, and else$)$ using led$\_$idx as

the sentinel to branch to a led operation.

$1.$ Only in the if and elif blocks, the corresponding led should be turned

on for the user desired on time, and then turned off.

$2.$ The GPIO pin should be selected using the list collection type variable

leds and the led$\_$idx.

$3.$ The else block should display that the user entered a wrong led

selection.

$4.$ In the if and elif blocks, the user should be prompted to enter the

desired on time, and stored in an appropriate data type

$5.$ In the if and elif blocks, after the led is turned off, display the led

was on for xx secs

Points: $12$

$"""$

$"""$

Prompt the user to enter $0$ for exiting the program

or $1$ to continue.

Store the user entered value in the boolean variable flag$\_$cont.

Hint: An integer $0$ can be transformed into a boolean type False, and

an integer $1$ to boolean type True

Points: $2$

$"""$

print$(\text{'}$End of Execution'$)$

GPIO.cleanup$()$