Basic Library

Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.

Standard Library

Ethernet
Servo Motor
Stepping Motor
Character LCD
SPI
I2C (Wire)
SD Card
SD (File Operations)
Periodic Operation
Clock (RTC)
PPG (Pulse Generator)
WiFiEsp
ICS (Serial Servo)

FreeRTOS Tips

Overview
Task
Queue
Timer
Interrupt Management

Trigonometry

This library provides trigonometry functions, carrying out sin, cos and tan calculations. Other than this, you can use the operations provided by the C standard math library, such as acos, asin, atan, exp, and log.

sin

Description
Calculates the sine (sin) of an angle (in radians).
Syntax
sin(rad)
Parameters
rad: The angle in radians (float)
Returns
The sine of the angle (double)

cos

Description
Calculates the cosine (cos) of an angle (in radians).
Syntax
cos(rad)
Parameters
rad: The angle in radians (float)
Returns
The cosine of the angle (double)

tan

Description
Calculates the tangent (tan) of an angle (in radians).
Syntax
tan(rad)
Parameters
rad: The angle in radians (float)
Returns
The tangent of the angle (double)

Sample Program


#include <Arduino.h>
void setup(){
    Serial.begin(9600);
}
 
void loop(){
     // print labels 
    Serial.print("RAD");       // prints a label
    Serial.print("\t");        // prints a tab
    
    Serial.print("SIN");  
    Serial.print("\t");      
  
    Serial.print("COS"); 
    Serial.print("\t");   
  
    Serial.print("TAN");
    Serial.print("\t");
    Serial.println("");
     
    for(float x=0; x< PI; x+=0.01){    // only part of the ASCII chart, change to suit
  
    // print it out in many formats:
        Serial.print(x);       // print as an ASCII-encoded decimal - same as "DEC"
        Serial.print("\t");    // prints a tab
  
        Serial.print(sin(x));  // print as an ASCII-encoded decimal
        Serial.print("\t");    // prints a tab
  
        Serial.print(cos(x));  // print as an ASCII-encoded hexadecimal
        Serial.print("\t");    // prints a tab
  
        Serial.print(tan(x));  // print as an ASCII-encoded octal
        Serial.print("\t");    // prints a tab
  
        Serial.println("");      // prints another carriage return
        delay(100);            // delay 100 milliseconds
    }
  
}