Lesson 4: Structure of a Sketch(Program)

 

Statements are always followed by semicolons;

Example 1: Servo "Knob"

#include <Servo.h>

Servo myservo; // create servo object to control a servo

int potpin = A0; // analog pin used to connect the potentiometer

int val; // variable to read the value from the analog pin

void setup() {

myservo.attach(9); // attaches the servo on pin 9 to the servo object

}

void loop() {

val = analogRead(potpin); // reads the value of the potentiometer (value between 0 and 1023)

val = map(val, 0, 1023, 0, 180); // scale it for use with the servo (value between 0 and 180)

myservo.write(val); // sets the servo position according to the scaled value

delay(15); // waits for the servo to get there

}

Example 2: "Blink"

// the setup function runs once when you press reset or power the board

void setup() {

// initialize digital pin LED_BUILTIN as an output.

pinMode(LED_BUILTIN, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)

delay(1000); // wait for a second

digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW

delay(1000); // wait for a second

}

The Arduino IDE(Integrated Development Environment) can be downloaded at:

https://www.arduino.cc/en/software

There is also an online version at https://create.arduino.cc/editor. Once you log in, your code is saved in the cloud.