Group 3 Application Sketch

sketch.c

#include <LiquidCrystal.h>
#include<stdlib.h>
LiquidCrystal lcd(7, 8, 9, 10, 11, 12); 

float mpgs[10];
int counter = 0;

const int numReadings = 10;

float readings[numReadings];
int readIndex = 0;        
float total = 0;             
float average = 0;          

int inputPin = A0;

void setup() {
  
  lcd.begin(16, 2);
  lcd.print("Group 3");
  lcd.setCursor(0, 1);
  lcd.print("MPG calculator");

  delay(5000);

  int i;
  for (i = 0; i < 16; i++) {

    lcd.scrollDisplayRight();

    delay(150);
    
  }

  lcd.clear();

 for (int thisReading = 0; thisReading < numReadings; thisReading++) {
    
    readings[thisReading] = 0;
      
  }
  
}

void loop() {

  lcd.setCursor(0, 0);
  lcd.print("1998 Honda Civic");

  total = total - readings[readIndex];

  float val = analogRead(0);

  // Bring it into a typical RPM rate
  val /= 1023;
  val *= 7500;

  // 1998 Honda Accord approximate gph per rpm (1gph to 2833 rpms)
  val += 2833;
 
  float mpg = 55 / (val / 2833);
  
  readings[readIndex] = mpg;
  total = total + readings[readIndex];

  readIndex++;
  
  if (readIndex >= numReadings) {
    readIndex = 0;
  }

  average = total / numReadings;

  lcd.setCursor(0, 1);
  lcd.print(average);

  lcd.setCursor(5, 1);
  lcd.print("MPG @ 55MPH");
  
  delay(1000);
  
}