fmod()

[Math]

double fmod(double x, double y);

Description

Returns the remainder of the division of $\frac{x}{y}$.

Parameters

x: The dividend value. y: The divisor value.

Returns

The remainder of the division of $\frac{x}{y}$.

Example Code

The code reads the value of two potentiometers connected to pins INX and INY and place the remainder of the division of $\frac{x}{y}$ on pin OUT.

void setup() {
    pinLabel(0, "INY");  // set the label of pin 0 to "INY"
    pinLabel(1, "INX");  // set the label of pin 1 to "INX"
    pinLabel(2, "OUT");  // set the label of pin 2 to "OUT"
    pinMode(2, OUTPUT);  // set pin 2 as output
    pinLabel(3, "VCC");  // set the label of pin 3 to "VCC"
    powerPin(3);         // set pin 3 as power pin
    pinLabel(4, "GND");  // set the label of pin 4 to "GND"
    groundPin(4);        // set pin 4 as ground pin
}
void loop() {
    int val_x = analogRead(0); // read the value of the potentiometers
    int val_y = analogRead(1);
    // map the values of the potentiometers from 0 to 1023
    // to the range of 0 to 10
    double x = map(val_x, 0, 1023, 0, 10);
    double y = map(val_y, 0, 1023, 0, 10);
    double z = fmod(x, y); // calculate the remainder of the division
    int pwm = (int) map(z, 0, 10, 0, 1023); // map the value
    analogWrite(2, pwm); // write the value of pwm to pin 2
}