Question

Please clearly show and explain how I am to do this:

Using TinkerCad or the Arduino kit, create a circuit using a keypad and one 7-segment display. When you press any key on the keypad it must be displayed on the 7-segment display. Due to the limited number of pins on the Uno (TinkerCad) you must use the Analog Pins as Digital inputs.

Answer 1

Code

#include<Keypad.h>

#define KEY_ROWS 4
#define KEY_COLS 4

char keymap[KEY_ROWS][KEY_COLS]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}, 
};

byte colPins[KEY_COLS]={A0,A1,A2,A3}; //Initialising all the required pins
byte rowPins[KEY_ROWS]={0,4,2,3};

Keypad myKeypad = Keypad(makeKeymap(keymap),rowPins,colPins,KEY_ROWS,KEY_COLS); //Calling the Keypad class from the librrary
void setup()
{
  Serial.begin(9600);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop()
{
  char key = myKeypad.getKey(); //This gets the inputed charachter from the keypad
  
  if (key=='0')    //It goes through a series of if statements to check which is the clicked button and lights up the seven segment display accordingly
  { 
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, LOW);
    
  }
  
  if (key=='1')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    digitalWrite(12, LOW);
    
  }

  if (key=='2')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='3')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='4')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='5')
  {
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(5, LOW);
  }
  
  if (key=='6')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='7')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    digitalWrite(12, LOW);
    
  }
  
  if (key=='8')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
   
  }
  
  if (key=='9')
  {
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='A')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
   
  }
  
  if (key=='B')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='C')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, LOW);
    
  }
  
  if (key=='D')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, LOW);
   
  }
  
  if (key=='*')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
    
  }
  
  if (key=='#')
  {
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    digitalWrite(12, HIGH);
    
  }
}

Circuit Diagram

Code is explained in Comments please comment if more information is needed.