# 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! ðŸ™‚

[cc lang=”c”]

/* 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() { }

[/cc]

ðŸ™‚

hello sir…

how to write this formula(Ï€/3 h(R^2+Rr+r^2)) for coding arduino…

Ï€=3.1248

h=14 cm

R=91 cm

r= 74 cm

thanks

Is it possible to enter the following equation in to an Arduino sketch.

I am using an RTD temp sensor. the output is non linear.

i generated the equation below with Microsoft Excel.

y = 28.089×5 – 158.77×4 + 410.33×3 – 426.65×2 + 532.31x – 320.03

RÂ² = 1

correction.

y = 28.089x^5 – 158.77x^4 + 410.33x^3 – 426.65x^2 + 532.31x^ – 320.03RÂ² = 1

Thanks’

Steven,

Why not?

Check this out https://www.arduino.cc/en/Reference/Pow