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1. Simulation

Simulation is a process where you can test your code without having to actually build it. You can use Wokwi to simulate your code. Wokwi is a web-based simulator for Arduino, ESP32, and other microcontrollers. You can use Wokwi to simulate your code and see how it works.

Wokwi

Write a program that will blink the LED.

1.1.1. Create a new project​

Create a new project in Wokwi.

  • Choose the XIAO ESP32S3 development board.
  • Add a LED component.
  • Add a Button component.

1.1.2 Write a program​

#define  LED_PIN D2
#define  BTN_PIN D3

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BTN_PIN, INPUT);
}

void loop() {
  if(!digitalRead(BTN_PIN)){
    digitalWrite(LED_PIN, HIGH);
  }else{
    digitalWrite(LED_PIN,LOW);
  }
}

1.1.3 Run the program​

Run the program and see how it works.

While you press the button, the LED will On, while you release the button, the LED will Off.

1.2. OLED​

write a program that will display hello, fab academy! on the OLED screen.

1.2.1. Create a new project​

Create a new project in Wokwi.

  • Choose the XIAO ESP32S3 development board.
  • Add a OLED component.

1.2.2 Write a program​

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

#define SCREEN_WIDTH 128 // OLED width in pixels.
#define SCREEN_HEIGHT 64 // OLED height (pixels)
#define OLED_RESET -1 // reset pin (-1 means share Arduino reset pin)
#define I2C_ADDRESS 0x3C // Common I2C address (0x3C or 0x3D)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Wire.begin(SDA, SCL); // Initialize I2C, default pins of XIAO ESP32S3 are D4(SDA)/D5(SCL).

  // Initialize OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, I2C_ADDRESS)) {
    Serial.println(F("SSD1306 failed to allocate"));
    for(;;); // stuck loop
  }

  display.clearDisplay(); // clear display cache
  display.setTextSize(1); // set the text size (1:1 ratio)
  display.setTextColor(SSD1306_WHITE); // draw white text

  display.setCursor(0, 0); // start coordinate (0,0)
  display.println("hello, fab academy"); // draw white text.

  display.println("hello, fab academy");
  display.display(); // output the cached content to the screen
}

void loop() {
  // Empty loop, only need to display once
}

1.2.3 Run the program​

Run the program and see how it works.

Resources​