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https://raw.githubusercontent.com/stm32duino/BoardManagerFiles/master/STM32/package_stm_index.json

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const int ledPin = PC13; // LED pin

void setup() {
pinMode(ledPin, OUTPUT);
}

void loop() {
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}

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const int ledPin = 13;

void setup() {
pinMode(ledPin, OUTPUT);

// Setting up timer 2 for generating a delay
TCCR2A = 0; // Normal mode
TCCR2B = (1 << CS22) | (1 << CS21) | (1 << CS20); // Divider set to 1024
TIMSK2 = (1 << TOIE2); // Enable interrupt on overflow
}

ISR(TIMER2_OVF_vect) {
digitalWrite(ledPin, HIGH); // Turning on the LED
delay(1000); // Delay of 1 second
digitalWrite(ledPin, LOW); // Turning off the LED
}

void loop() {
// Other tasks can be performed here
}

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const int ledPin = 13;

void setup() {
pinMode(ledPin, OUTPUT);

// Setting up timer 1 for signal generation
TCCR1A = (1 << COM1A0); // Clearing on compare match with OCR1A
TCCR1B = (1 << WGM12) | (1 << CS10); // CTC mode and divider set to 1
OCR1A = 15624; // Value to achieve a frequency of around 1 Hz
}

void loop() {
// Other tasks can be performed here
}

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const int buttonPin = 2;
volatile int buttonCount = 0;

void setup() {
pinMode(buttonPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(buttonPin), countButton, FALLING);
Serial.begin(9600);
}

void loop() {
// Printing the counter value to the Serial Monitor
Serial.println(buttonCount);
delay(1000);
}

void countButton() {
buttonCount++;
}

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const int analogPin = A0; // Analog signal pin

void setup() {
Serial.begin(9600);
}

void loop() {
int analogValue = analogRead(analogPin); // Read analog value
float voltage = analogValue * (5.0 / 1023.0); // Convert to voltage
Serial.print("Analog Value: ");
Serial.print(analogValue);
Serial.print(", Voltage: ");
Serial.println(voltage);
delay(1000);
}

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const int ledPin = 9; // PWM pin
int brightness = 0; // Initial brightness
int fadeAmount = 5; // Brightness increment step

void setup() {
pinMode(ledPin, OUTPUT);
}

void loop() {
analogWrite(ledPin, brightness);

brightness += fadeAmount; // Increase brightness by step

if (brightness <= 0 || brightness >= 255) {
fadeAmount = -fadeAmount; // Change the direction of brightness change
}

delay(30); // Delay for a visible brightness change effect
}

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void setup() {
Serial.begin(9600); // Starting UART communication at a speed of 9600 bits per second
}

void loop() {
if (Serial.available()) { // If data is available for reading
char data = Serial.read(); // Read the data
Serial.print("Received: ");
Serial.println(data);
}
}

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#include <Wire.h> // Include the Wire library for working with I2C

void setup() {
Wire.begin(); // Initialize the I2C bus
Serial.begin(9600);
}

void loop() {
Wire.beginTransmission(8); // Start the transmission to the device with address 8
Wire.write('A'); // Transmit the data
Wire.endTransmission(); // End the transmission

delay(500);

Wire.requestFrom(8, 1); // Request data from the device with address 8
if (Wire.available()) {
char data = Wire.read(); // Read the data
Serial.print("Received: ");
Serial.println(data);
}

delay(1000);
}

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#include <SPI.h> // Include the SPI library

const int slaveSelectPin = 10; // Device select pin

void setup() {
SPI.begin(); // Initialize SPI
pinMode(slaveSelectPin, OUTPUT);
digitalWrite(slaveSelectPin, HIGH); // Disable the default device
Serial.begin(9600);
}

void loop() {
digitalWrite(slaveSelectPin, LOW); // Enable the device
SPI.transfer('A'); // Transfer data over SPI
digitalWrite(slaveSelectPin, HIGH); // Disable the device

delay(500);

digitalWrite(slaveSelectPin, LOW);
char data = SPI.transfer(0); // Receive data from the device
digitalWrite(slaveSelectPin, HIGH);

Serial.print("Received: ");
Serial.println(data);

delay(1000);
}