Control a buzzer by the ESP32 card

Purpose of this tutorial:

To control a buzzer using an ESP32, you would need to connect the buzzer to a digital output pin on the ESP32 and write code to control the pin’s state.

The buzzer is an electronic device that produces sound when an alternating current is applied to it, so to make it sound we need to generate a square wave with the correct frequency, the ESP32 has digital output pins that can be set to high or low, if we set a digital pin to high and low at a certain frequency we can generate that square wave and make the buzzer sound.

The goal of this tutorial is to sound a buzzer with the ESP32 card.

Necessary components

ESP32

The ESP32 is a low-cost, low-power microcontroller with built-in Wi-Fi and Bluetooth capabilities. It is a popular choice for IoT projects and is commonly used for a variety of applications such as home automation, wireless control, and sensor data logging. The ESP32 features a dual-core processor, a rich set of peripherals, and support for a wide range of protocols. It can be programmed using the Arduino IDE and various other programming languages such as C, C++, and MicroPython.

Additionally, the ESP32 has a wide range of features including:

• A high-performance processor with a clock speed of up to 240 MHz
• Support for various types of wireless connectivity such as Wi-Fi, Bluetooth, and Bluetooth Low Energy (BLE)
• Multiple communication interfaces such as I2C, SPI, UART, and I2S
• A large number of GPIO pins to connect to external devices and sensors
• A built-in security module for secure communication

The ESP32 is often used in projects where a low-cost, low-power device with Wi-Fi and Bluetooth capabilities is needed, and it is commonly used with other sensors and devices to build IoT projects, home automation systems, wireless control systems, and data logging systems.

Buzzer

A buzzer is an electronic device that generates sound by converting electrical energy into sound energy. It typically consists of a piezoelectric crystal, which expands and contracts when an alternating current is applied to it, creating sound waves.

There are different types of buzzers available, including piezoelectric, magnetic, and electro-mechanical buzzers. Piezoelectric buzzers are the most common and widely used, as they are small, inexpensive, and easy to control.

Buzzers can be controlled using a variety of methods, such as using a microcontroller to generate a square wave with the correct frequency, or using a specialized IC (Integrated Circuit) such as a 555 timer.

Buzzers are commonly used in a wide range of applications such as alarms, timers, and warning systems. They can also be used in electronic devices such as mobile phones, computers, and other electronic devices to generate different sounds and tones.

Piezoelectric buzzers are relatively simple to use and are widely used in DIY and hobby projects, including those that use microcontrollers such as the ESP32. They can be easily controlled by a microcontroller by applying a square wave with the desired frequency to the control pin of the buzzer.

Connecting wires

Connecting wires refers to the process of physically connecting wires or cables to a device or circuit in order to establish an electrical connection. This can be done by using various connectors such as plugs, sockets, or terminal blocks. The wires are typically color-coded to indicate their function, such as red for power, black for ground, and yellow for signals.

Test plate 

A test plate is a type of circuit board that is used to test electronic components. It typically consists of a flat board made of a non-conductive material, such as plastic or fiberglass, with a number of holes or pads that are used to connect electronic components. The test plate allows you to connect electronic components and test them easily.

Mounting

The assembly consists in connecting the terminal (+) of the buzzer to pin D23 and the terminal (-) to the GND of the ESP32 card.

Micropython program