Arduino Electronics Engineering Hardware Software
Apr 4, 2011
DanielAndrade
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Using Arduino to calculate Quadratic function

This is a simple and quick code I made for teach variables with arduino programming,
where we enter the variable numbers a, b, c in

and we get the answer using the Serial Monitor..

I won’t get in details about this code, it’s quite straightforward. But if you have any question, just ask! :)

/* Bhaskara Calculator
   Daniel Spillere Andrade - www.danielandrade.net
   Simple code showing how to use arduino to calculate Quadratic function.
   
   X =>   [-b +- sqrt( b^2 - 4ac)] / 2a
   
   Change the a, b and c to get the result via Serial Monitor
*/
int a = 1;
int b = -10;
int c = 25;
float delta, result1, result2;


#include "math.h" // Math!
 
void setup() {

     Serial.begin(9600);
     
     // Calculte delta
     // b^2 - 4 * a * c
     
     delta = pow(b,2) - 4 * a * c;
     
     // Analize delta
     
     if(delta<0) {
       Serial.print("DELTA=");Serial.println(delta);
       Serial.println("Delta < 0, can't calculate!");
       // Ends the program
     }
     
     else if (delta==0) {
       Serial.println("Delta = 0, we can calculate!!!");
       
        result1 = result2 = (-b) / (2 * a);
       
        Serial.print("X1=X2="); Serial.println(result1);
       
     }
     
     else if (delta>0) {
       
       // X1 != X2
       
       delta = sqrt(delta);
       
       Serial.print("DELTA=");Serial.println(delta);
       Serial.println("Delta > 0, we can calculate");
       
        result1 = (-b + delta) / (2 * a);
        result2 = (-b - delta) / (2 * a);
       
        Serial.print("X1="); Serial.println(result1);
        Serial.print("X2="); Serial.println(result2);
     }
     
    //Done

}
 
 
void loop() { }

:)

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