Electronics

ESP32 NodeMCU WiFi and Bluetooth Module

AED 29.00

1

Description

The ESP32 NodeMcu is a versatile, low-cost WiFi and Bluetooth-enabled development board based on the ESP32 microcontroller. It features dual-core processing, 4MB flash memory, and a wide range of connectivity options, including WiFi, Bluetooth, and several serial communication protocols. The board can be programmed using the Arduino IDE or with other programming languages like MicroPython or Lua. It's popular for projects that require wireless connectivity and low power consumption, such as IoT devices, home automation, and robotics.

 

Package Includes:

  • 1 x ESP32 NodeMcu Board

 

Features:

  • Dual-core 32-bit microcontroller based on the Xtensa LX6 architecture
  • Integrated 802.11 b/g/n WiFi and Bluetooth 4.2 BLE connectivity
  • 4MB flash memory for program storage
  • Support for several serial communication protocols, including UART, I2C, SPI, and SDIO
  • Integrated USB-to-serial converter for easy programming and debugging
  • 12-bit ADC for analog input
  • Support for PWM output and touch sensors
  • Compatible with the Arduino IDE and other popular programming languages like MicroPython and Lua
  • Low power consumption, with several power-saving modes available
  • Small form factor and low cost, making it ideal for a wide range of projects

 

Description:

The ESP32 NodeMcu development board is a powerful and versatile microcontroller board that provides an easy-to-use platform for developing a wide range of IoT applications. It is based on the ESP32 microcontroller, which is a low-cost, low-power system-on-chip with integrated WiFi and Bluetooth capabilities. One of the key features of the ESP32 NodeMcu board is its dual-core processor, which enables it to perform complex tasks while still maintaining low power consumption. The board also includes 4MB of flash memory for program storage, as well as support for several serial communication protocols, including UART, I2C, SPI, and SDIO. ESP32 NodeMcu board also includes several built-in features that make it easy to develop a wide range of applications. These features include a 12-bit ADC for analog input, support for PWM output and touch sensors, and compatibility with the Arduino IDE and other popular programming languages like MicroPython and Lua. The ESP32 NodeMcu board also includes an integrated USB-to-serial converter, which makes it easy to program and debug the board using a standard USB cable. And thanks to its low power consumption and several power-saving modes, the board is ideal for battery-powered and energy-efficient projects.

 

Principle of Work:

On the board itself, some of the key components include:

  • ESP32 module: This is the main component of the board, which includes the dual-core processor, WiFi and Bluetooth connectivity, and several other components.
  • USB-to-serial converter: This component allows the board to communicate with a computer via USB and enables programming and debugging of the board.
  • Voltage regulator: This component regulates the voltage input to the board, ensuring that it operates within safe voltage levels.
  • LEDs and buttons: These components provide visual feedback and allow for user input.

Inside the ESP32 module, some of the key components include:

  • Dual-core processor: This is the main processing unit of the ESP32, which enables it to perform complex tasks while maintaining low power consumption.
  • WiFi and Bluetooth modules: These components provide wireless connectivity for the ESP32, allowing it to communicate with other devices over WiFi or Bluetooth.
  • Memory: The ESP32 module includes several types of memory, including flash memory for program storage, SRAM for data storage, and PSRAM for extended data storage.
  • Peripheral interfaces: The ESP32 module includes several peripheral interfaces, such as UART, I2C, SPI, and SDIO, which allow it to communicate with other devices and sensors.

When the board is powered on, the ESP32 module initializes and begins executing the program stored in its flash memory. The program can interact with the various components and interfaces available on the board, allowing for a wide range of applications and projects.

 

 

Pinout of the Module:

 

  • 3.3V: This is the power supply pin for 3.3V. It can be used to power external devices that require 3.3V power.
  • VIN: This is the power supply pin for external power input. It can accept a voltage input between 5V and 12V, which will be regulated down to 3.3V for the ESP32 and any connected peripherals.
  • GND: This is the ground pin for the board.
  • SCL (22): This pin is used for I2C communication and is also referred to as the clock pin. It is used to synchronize data transfer between the ESP32 and I2C devices.
  • SDA (23): This pin is used for I2C communication and is also referred to as the data pin. It is used to transfer data between the ESP32 and I2C devices.
  • MOSI (19): This pin is used for SPI communication and is also referred to as the Master Out Slave In (MOSI) pin. It is used to transmit data from the ESP32 to SPI devices.
  • MISO (18): This pin is used for SPI communication and is also referred to as the Master In Slave Out (MISO) pin. It is used to receive data from SPI devices.
  • SCK (5): This pin is used for SPI communication and is also referred to as the clock pin. It is used to synchronize data transfer between the ESP32 and SPI devices.
  • CS (15): This pin is used for SPI communication and is also referred to as the chip select pin. It is used to select which SPI device the ESP32 is communicating with.
  • A0 (36): This is an analog input pin that can read voltage levels between 0V and 3.3V. It can be used to connect analog sensors or to read the output of a voltage divider.
  • A3 (39): This is another analog input pin that can read voltage levels between 0V and 3.3V.
  • A6 (34): This is an additional analog input pin that can read voltage levels between 0V and 3.3V.
  • A7 (35): This is another analog input pin that can read voltage levels between 0V and 3.3V.
  • A4 (32): This is an analog input pin that can read voltage levels between 0V and 3.3V.
  • A5 (33): This is another analog input pin that can read voltage levels between 0V and 3.3V.
  • RX (0): This is the UART receive pin. It can be used to receive serial data from other devices.
  • TX (3): This is the UART transmit pin. It can be used to send serial data to other devices.
  • Pin 1 and Pin 2: These are general-purpose digital input/output (GPIO) pins. They can be used for a variety of purposes, such as controlling LEDs, reading button inputs, or communicating with other digital devices.
  • Pin 5 and Pin 17: These are general-purpose GPIO pins that can also be used as PWM (pulse-width modulation) output pins. They can be used to control the brightness of LEDs, the speed of motors, or the tone of speakers.

 

Applications:

  • Home automation: The ESP32 NodeMCU board can be used to control smart home devices such as lights, temperature sensors, and door locks.
  • IoT applications: The board can be used to build a wide range of IoT applications such as weather stations, environmental monitoring systems, and smart agriculture systems.
  • Robotics: The board can be used as a controller for small robots, drones, and other autonomous systems.
  • Wireless communication: The board supports both Wi-Fi and Bluetooth communication protocols, making it ideal for building wireless communication systems.
  • Industrial automation: The board can be used to monitor and control industrial equipment and processes.
  • Data logging: The board can be used to log data from sensors and other devices, and then transmit the data to a server or cloud-based platform for analysis.
  • Education: The board is a popular tool for teaching electronics, programming, and IoT concepts in schools and universities.
  • Wearables: The board's small form factor and low power consumption make it suitable for building wearable devices such as smartwatches and fitness trackers.

 

Circuit

We will blink the onboard LED no need for a circuit.

Library: 

Getting started with the ESP32 NodeMCU board is relatively easy. Here are the steps you can follow:

  1. Get the board and necessary accessories: You will need an ESP32 NodeMCU board, a micro-USB cable for power and data transfer, and a computer with the Arduino IDE or another compatible development environment installed.
  2. Install the ESP32 board drivers: You will need to install the ESP32 board drivers on your computer before you can start using the board. The drivers can be downloaded from the Espressif website.
  3. Install the Arduino IDE: If you do not have the Arduino IDE installed on your computer, you can download it from the Arduino website.
  4. Configure the Arduino IDE: Open the Arduino IDE and go to File > Preferences. In the Additional Boards Manager URLs field, add the following URL: https://dl.espressif.com/dl/package_esp32_index.json
  5. Install the ESP32 board package: Go to Tools > Board > Boards Manager, search for "ESP32" and install the "esp32" package.
  6. Connect the board: Connect the ESP32 NodeMCU board to your computer using the micro-USB cable.
  7. Select the board: In the Arduino IDE, go to Tools > Board and select "NodeMCU-32S".

 

Code:

  • Upload a test sketch: Open the "Blink" sketch (File > Examples > 01.Basics > Blink) and upload it to the board by clicking the "Upload" button.
  • or just copy the next code:
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

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

  • his code sets up the built-in LED as an output pin in the setup() function, and then blinks the LED on and off with a 1-second delay using the digitalWrite() and delay() functions in the loop() function.
  • Verify that the sketch is running: Once the sketch is uploaded, the onboard LED should start blinking.

Congratulations! You have successfully started with the ESP32 NodeMCU board. From here, you can explore more advanced projects and the capabilities of the board.

 

Technical Details: 

  • Processor: Tensilica LX6 dual-core
  • Clock speed: 240 MHz
  • SRAM: 512 kB
  • Memory: 4 MB
  • Wireless standard: 802.11 b/g/n
  • Frequency: 2.4 GHz
  • Bluetooth: Classic / LE
  • Data interfaces: UART / I2C / SPI / DAC / ADC
  • Operating voltage: 3.3 V (can be operated via 5-V micro-USB)
  • Operating temperature: -40 to 125°C
  • Dimensions: 48 x 26 x 11.5 mm

 

Resources:

 

Comparisons:

The ESP32 NodeMCU and ESP8266 NodeMCU are two popular development boards that are designed for IoT projects. Here are some differences between the two boards:

  1. Processor: The ESP32 NodeMCU is based on the more powerful ESP32 processor, which has dual cores, more memory, and supports more communication protocols than the ESP8266 processor used in the ESP8266 NodeMCU.
  2. Communication protocols: The ESP32 NodeMCU supports both Wi-Fi and Bluetooth communication protocols, while the ESP8266 NodeMCU supports only Wi-Fi.
  3. GPIO pins: The ESP32 NodeMCU has more GPIO pins than the ESP8266 NodeMCU, which allows for more sensors and other devices to be connected to the board.
  4. Power consumption: The ESP8266 NodeMCU consumes less power than the ESP32 NodeMCU, making it a better choice for battery-powered projects.
  5. Cost: The ESP8266 NodeMCU is generally less expensive than the ESP32 NodeMCU, making it a more cost-effective option for some projects.

The ESP32 NodeMCU offers more processing power, support for additional communication protocols, and more GPIO pins, while the ESP8266 NodeMCU is more power-efficient and less expensive. Ultimately, the choice between the two boards will depend on the specific requirements of your project.