Activity 1. Buzzer and LED
This activity utilizes Arduino Uno output pins to generate audio and / or visual alerts. The activity is divided into 3 parts: a) use of buzzer, b) use of LED, c) use of buzzer and LED. (50 minutes)
Activity 1a
In this part the aim is to turn a buzzer on and off every 2.5 seconds.
Step 1. Draw the circuit in Tinkercad. A buzzer is connected to the Arduino Uno
Step 2. Study the code and write it on the microcontroller:
/* Buzzer
Circuit Connections:
PIN_4 => Buzzer_Positive - Buzzer_Negative = > Resistor 100Ω => Gnd
*/
//The setup() function initializes and sets the initial values
//It will only run once after each powerup or reset
void setup()
{
//Configures the PIN_4 to behave as output
pinMode(4, OUTPUT);
}
//This function loops consecutively
void loop()
{
digitalWrite(4, HIGH); //Write a HIGH value (5V) to digital pin 4 – Buzzer on
delay(2500); // Pauses the program for 2500 milliseconds
digitalWrite(4, LOW); //Write a LOW value (0V) to digital pin 4 – Buzzer off
delay(2500); // Wait for 2500 milliseconds
}
Step 3. Run the simulation and check the correct operation of the circuit