How to create a function esp32[SOLVED]

Projects General Guidance
1

I am trying to make a red light green light but I need not make functions but I don't no how to.
If you want my code just ask and can you help please.

2

Example of a function:

void some_function(int light) {
if (light == 0) do_something();
else do_something_else();
}
3

How to write an Arduino function.

For more information, Google "arduino functions".

4

It's frustrating that too many members need so much help to make a proper posting. Read this link: How to get the best out of this forum - Using Arduino / Project Guidance - Arduino Forum

1 Like
5

functions are documented in the Arduino reference on this site

6

Can you give me some code with it or a video of how to do functions please.
Code

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <ESP32Servo.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

const int trigPin = 5;
const int echoPin = 18;

const int servoPin = 12;


//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
int distanceCm;
int distanceInch;

int servoVal = 180;

int buzzPin = 17;
int buzzTime = 100000;
int buzzTime2 = 10000;
int buzzTime3 = 1000;
int buzzTime4 = 4;

Servo myServo;

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  pinMode(buzzPin, OUTPUT);

  myServo.attach(servoPin);
  myServo.write(servoVal);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(500);
  display.clearDisplay();

  display.setTextSize(2);
  display.setTextColor(WHITE);
}

void loop() {
  
  
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distanceCm = duration * SOUND_SPEED / 2;

  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;

  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);

  display.clearDisplay();
  display.setCursor(0, 0);
  //  Display distance in cm
  display.print(distanceCm);
  display.print(" cm");

  // Display distance in inches
  display.setCursor(0, 15);
  display.print(distanceInch);
  display.print(" in");
  display.display();

  // Display :)
  display.setCursor(0, 30);
  display.print(":)");
  display.display();

  // Display Good
  display.setCursor(0, 45);
  display.print("Good");
  display.display();


  // Display ----
  display.setCursor(0, 55);
  display.print("----");
  display.display();

  if (distanceCm > 0 && distanceCm < 100) {
    Serial.println("Microsoft");
    digitalWrite(buzzPin, HIGH);
    delayMicroseconds(buzzTime);
    digitalWrite(buzzPin, LOW);
    delayMicroseconds(buzzTime);
  }
  else {
    digitalWrite(buzzPin, LOW);
  }

  if (distanceCm > 100 && distanceCm < 500) {
    Serial.println("Microsoft");
    digitalWrite(buzzPin, HIGH);
    delayMicroseconds(buzzTime2);
    digitalWrite(buzzPin, LOW);
    delayMicroseconds(buzzTime2);
  }
  else {
    digitalWrite(buzzPin, LOW);
  }

  if (distanceCm > 500 && distanceCm < 1192) {
    Serial.println("Microsoft");
    digitalWrite(buzzPin, HIGH);
    delayMicroseconds(buzzTime3);
    digitalWrite(buzzPin, LOW);
    delayMicroseconds(buzzTime3);
  }
  else {
    digitalWrite(buzzPin, LOW);
  }
  delay(500);
}
7

You mean like post #2 and post #3?

What parts of your code do you want to place in functions? Does your code work the way you want it to, now?

Are you doing it because it's a school assignment?

8

No just for practice.

9

See all the code you put in setup? That is a function. See all the code you put in loop? That is a function. Copy the syntax and put it outside of everything else, not in loop or setup.

Void myFuntion (){
Your code here;
}

To “call” your function in loop

myFuntion();

10

Thanks.

11

I have both an Italian and English keyboard active hence myFuntion rather than myFunction! :joy:

12

Suggest you always look here: https://www.arduino.cc/reference/en/

13

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