This document provides two programming problems to solve using Python. The first problem involves writing a program that turns on LEDs one at a time in a loop for 1 second each over 10 iterations. The second problem involves writing a program that prompts a user for two numbers, calculates their sum, and turns on a specific LED (red, yellow, or green) depending on whether the sum is less than 10, between 10 and 30 inclusive, or greater than 30. The document provides code snippets to import libraries and set up GPIO pins for the LEDs to assist in completing the program.

1. Problem 1: Write a short program in Python that turns on all
LEDs, one at a time, in a looping fashion. When an LED is on,
it should stay on for 1 second. You will use a while loop to
identify the number of loops. You will have a total of 10 loops.
Note: n is initialized to 0 (zero). Inside the ‘while’ loop, make
sure to change the value of n by incrementing by 1. Also, print
the iteration count using the following line of code:
print(“Iteration: “,n). Finish the code block:
#testing a while loop
#import GPIO library
#import time library
import RPi.GPIO as GPIO
import time
#Global variables
N = 0
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT) #red LED
GPIO.setup(11,GPIO.OUT)#green LED
GPIO.setup(13,GPIO.OUT)#yellow LED
Problem 2: Problem 2 is going to take you some time to think
through and write. Although not an extensively long program, it
will require anywhere between 20 and 30 lines of code. For this
reason, I am only giving you 2 problems for homework. Write a
short program in Python that turns on an LED based on the
answer to a math calculation. Your program should do the
following:
1. Print: Say hello to the end user and tell the end user that the
program is designed to add 2 integers.

2. 2. Print: Tell the end user that – if the answer is less than 10,
the red LED will turn on.
3. Print: Tell the end user that = if the answer is between (and
inclusive) 10 and 30, the yellow LED will turn on.
4. Print: Tell the end user that – if the answer is greater than 30,
the green LED will turn on.
5. Prompt the end user for 2 variables inputs, one at a time.
6. Calculate the addition problem.
7. Use an ‘if, else-if’ structure as described below.
Note, to ask the end user for an int input value, write the
following code:
x = int(input(“Enter a number to be added: “))
y = int(input(“Enter another number to be added: ))
Note, to use the if-else statement in Python, do the following:
If(answer <= 10):
Elif(answer > 10 or answer < 30):
Elif(answer >= 30):
PS Do not forget the ‘:’ (colon) at the end of these lines of
code!
Finish the code block:
#import GPIO library
#import time library
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT) #red LED
GPIO.setup(11,GPIO.OUT)#green LED
GPIO.setup(13,GPIO.OUT)#yellow LED