To begin programming, it was necessary to determine which LEDs were connected to which pins of the Seeeduino. To achieve this, I created a diagram to help identify these pins and communication ports.

Programming and Result

Board Installation Guide

First, you need to install the board. I obtained the necessary information from the Seeed Studio website. The initial step is to add a web address in the Arduino software preferences to install the XIAO SAMD21 board. After this, connect the board, select the appropriate COM port, and upload the code.

Steps to Install the XIAO SAMD21 Board

1. Open the Arduino software and go to File > Preferences.
2. In the Additional Boards Manager URLs field, add the URL provided by Seeed Studio.
3. Click OK to save the changes.
4. Go to Tools > Board > Boards Manager and search for "XIAO SAMD21".
5. Install the board package.
6. Connect the XIAO SAMD21 board to your computer using a USB cable.
7. In the Arduino software, go to Tools > Port and select the correct COM port for your board.
8. Write or open your code in the Arduino IDE and click the Upload button to upload the code to the board.

Test Code

const int buttonPin = A1;    
const int ledPin =  A0;      
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
   pinMode(ledPin, OUTPUT);
   pinMode(6, OUTPUT);
   pinMode(7, OUTPUT);
   pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH); 
  delay(1000);               
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);   
  delay(1000);
}