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How to Use B-L475E-IOT01A: Examples, Pinouts, and Specs

Image of B-L475E-IOT01A
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Introduction

The B-L475E-IOT01A is a development board manufactured by STM32, designed to simplify the development of Internet of Things (IoT) applications. It is powered by the STM32L475 microcontroller, which is optimized for low-power operation. The board integrates a wide range of sensors, connectivity options (Wi-Fi, Bluetooth, NFC), and expansion interfaces, making it a versatile platform for prototyping and deploying IoT solutions.

Explore Projects Built with B-L475E-IOT01A

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
ESP32 Mini Battery-Powered OLED Display with RTC and Potentiometer Control
Image of copy ulit nya: A project utilizing B-L475E-IOT01A in a practical application
This circuit is a battery-powered IoT device featuring an ESP32 microcontroller, an OLED display, and an RTC module for timekeeping. It includes a TP4056 for battery charging, a potentiometer for user input, and a pushbutton for resetting the ESP32. The circuit is designed to display information on the OLED and maintain accurate time using the RTC, with power management handled by the TP4056 and voltage regulation by the LM2596 and AMS1117.
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Bluetooth-Controlled Multi-Function Arduino Nano Gadget
Image of Copy of Smarttt: A project utilizing B-L475E-IOT01A in a practical application
This is a portable, microcontroller-driven interactive device featuring Bluetooth connectivity, visual (RGB LED), auditory (loudspeaker), and haptic (vibration motor) feedback, user input (pushbutton), and a rechargeable power system (TP4056 with Li-ion battery).
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MakerEdu Creator with Bluetooth, IR Sensors, LCD Display, and Push Button Interaction
Image of MKL Distance Measurement: A project utilizing B-L475E-IOT01A in a practical application
This circuit features a MakerEdu Creator microcontroller board interfaced with two MKE-S11 IR Infrared Obstacle Avoidance Sensors, a MKE-M02 Push Button Tact Switch, a MKE-M15 Bluetooth module, and a MKE-M08 LCD2004 I2C display module. The push button is connected to a digital input for user interaction, while the IR sensors are likely used for detecting obstacles. The Bluetooth module enables wireless communication, and the LCD display provides a user interface for displaying information or statuses.
Cirkit Designer LogoOpen Project in Cirkit Designer
I2C-Controlled OLED Display with External EEPROM and Interactive Pushbuttons
Image of godmode: A project utilizing B-L475E-IOT01A in a practical application
This is a microcontroller-based interactive device featuring a Wemos D1 Mini, an OLED display, external EEPROM, and an I/O expander. It includes user input buttons and status LEDs, with potential MIDI interface capabilities.
Cirkit Designer LogoOpen Project in Cirkit Designer

Explore Projects Built with B-L475E-IOT01A

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of copy ulit nya: A project utilizing B-L475E-IOT01A in a practical application
ESP32 Mini Battery-Powered OLED Display with RTC and Potentiometer Control
This circuit is a battery-powered IoT device featuring an ESP32 microcontroller, an OLED display, and an RTC module for timekeeping. It includes a TP4056 for battery charging, a potentiometer for user input, and a pushbutton for resetting the ESP32. The circuit is designed to display information on the OLED and maintain accurate time using the RTC, with power management handled by the TP4056 and voltage regulation by the LM2596 and AMS1117.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Copy of Smarttt: A project utilizing B-L475E-IOT01A in a practical application
Bluetooth-Controlled Multi-Function Arduino Nano Gadget
This is a portable, microcontroller-driven interactive device featuring Bluetooth connectivity, visual (RGB LED), auditory (loudspeaker), and haptic (vibration motor) feedback, user input (pushbutton), and a rechargeable power system (TP4056 with Li-ion battery).
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of MKL Distance Measurement: A project utilizing B-L475E-IOT01A in a practical application
MakerEdu Creator with Bluetooth, IR Sensors, LCD Display, and Push Button Interaction
This circuit features a MakerEdu Creator microcontroller board interfaced with two MKE-S11 IR Infrared Obstacle Avoidance Sensors, a MKE-M02 Push Button Tact Switch, a MKE-M15 Bluetooth module, and a MKE-M08 LCD2004 I2C display module. The push button is connected to a digital input for user interaction, while the IR sensors are likely used for detecting obstacles. The Bluetooth module enables wireless communication, and the LCD display provides a user interface for displaying information or statuses.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of godmode: A project utilizing B-L475E-IOT01A in a practical application
I2C-Controlled OLED Display with External EEPROM and Interactive Pushbuttons
This is a microcontroller-based interactive device featuring a Wemos D1 Mini, an OLED display, external EEPROM, and an I/O expander. It includes user input buttons and status LEDs, with potential MIDI interface capabilities.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Environmental monitoring (temperature, humidity, air quality)
  • Smart home devices
  • Wearable technology
  • Industrial IoT (IIoT) applications
  • Prototyping for connected devices
  • Battery-operated IoT systems

Technical Specifications

Key Technical Details

Feature Specification
Microcontroller STM32L475VG (ARM Cortex-M4, 80 MHz, 1 MB Flash, 128 KB RAM)
Connectivity Wi-Fi (ISM43362), Bluetooth Low Energy (BLE), NFC (ST25DV04K)
Sensors Temperature, humidity, pressure, magnetometer, gyroscope, accelerometer,
microphone, and Time-of-Flight (ToF) distance sensor
Power Supply USB (5V) or external battery (3.3V to 5V)
Operating Voltage 3.3V
Expansion Interfaces Arduino Uno V3-compatible headers, STMod+ connector
Debugging Integrated ST-LINK/V2-1 debugger/programmer
Dimensions 95 mm x 50 mm

Pin Configuration and Descriptions

The B-L475E-IOT01A features Arduino Uno V3-compatible headers for easy prototyping. Below is the pinout for the Arduino header:

Arduino Header Pinout

Pin Name Function Description
A0-A5 Analog Input 6 analog input pins for sensors or other devices
D0-D13 Digital I/O 14 digital I/O pins (PWM available on some pins)
3.3V Power Output 3.3V power supply for external components
5V Power Output 5V power supply for external components
GND Ground Common ground
VIN Power Input External power input (3.3V to 5V)
SDA/SCL I2C Communication I2C data and clock lines
TX/RX UART Communication Serial communication pins

STMod+ Connector Pinout

Pin Name Function Description
1-2 Power Supply 3.3V and GND
3-4 UART TX and RX for serial communication
5-6 I2C SDA and SCL for I2C communication
7-8 GPIO General-purpose input/output pins

Usage Instructions

How to Use the Component in a Circuit

  1. Powering the Board:

    • Connect the board to a computer or USB power source using a micro-USB cable.
    • Alternatively, supply power through the VIN pin (3.3V to 5V) for battery-operated applications.
  2. Connecting Sensors and Peripherals:

    • Use the Arduino-compatible headers to connect external sensors or actuators.
    • For I2C devices, connect to the SDA and SCL pins. For UART devices, use the TX and RX pins.
  3. Programming the Board:

    • Install the STM32CubeIDE or Arduino IDE (with STM32 support) on your computer.
    • Connect the board via USB and select the appropriate COM port in the IDE.
    • Write and upload your code to the board.
  4. Using Built-in Sensors:

    • The board includes several onboard sensors (e.g., temperature, humidity, accelerometer). These can be accessed using STM32 HAL libraries or Arduino libraries.

Important Considerations and Best Practices

  • Power Consumption: Use the low-power features of the STM32L475 microcontroller to extend battery life in portable applications.
  • Debugging: Use the integrated ST-LINK/V2-1 debugger for efficient debugging and programming.
  • Firmware Updates: Keep the firmware updated to ensure compatibility with the latest libraries and tools.
  • Connectivity: Ensure proper configuration of Wi-Fi and Bluetooth settings for reliable communication.

Example Code for Arduino IDE

The following example demonstrates how to read temperature data from the onboard HTS221 sensor and print it to the serial monitor.

#include <Wire.h>
#include <HTS221Sensor.h> // Include the library for the HTS221 sensor

// Define I2C address for the HTS221 sensor
#define HTS221_I2C_ADDRESS 0x5F

// Create an instance of the HTS221 sensor
HTS221Sensor hts221(&Wire);

void setup() {
  Serial.begin(9600); // Initialize serial communication
  Wire.begin();       // Initialize I2C communication

  // Initialize the HTS221 sensor
  if (hts221.begin(HTS221_I2C_ADDRESS)) {
    Serial.println("HTS221 sensor initialized successfully.");
  } else {
    Serial.println("Failed to initialize HTS221 sensor.");
    while (1); // Halt execution if initialization fails
  }
}

void loop() {
  float temperature;

  // Read temperature from the HTS221 sensor
  if (hts221.getTemperature(&temperature)) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
  } else {
    Serial.println("Failed to read temperature.");
  }

  delay(1000); // Wait for 1 second before the next reading
}

Troubleshooting and FAQs

Common Issues and Solutions

  1. Board Not Detected by IDE:

    • Ensure the USB cable is properly connected and functional.
    • Verify that the correct COM port is selected in the IDE.
    • Update the ST-LINK driver if necessary.
  2. Sensors Not Responding:

    • Check the I2C or SPI connections for external sensors.
    • Ensure the correct sensor address is used in the code.
  3. Wi-Fi or Bluetooth Not Connecting:

    • Verify the network credentials (SSID and password) in the code.
    • Ensure the board is within range of the Wi-Fi router or Bluetooth device.
  4. High Power Consumption:

    • Use the low-power modes of the STM32L475 microcontroller.
    • Disable unused peripherals to reduce power consumption.

FAQs

Q: Can I use the B-L475E-IOT01A with the Arduino IDE?
A: Yes, the board is compatible with the Arduino IDE. Install the STM32 core for Arduino to get started.

Q: How do I update the firmware on the board?
A: Use the STM32CubeProgrammer tool to update the firmware via the USB interface.

Q: What is the range of the onboard Wi-Fi module?
A: The range depends on environmental factors but typically covers 30-50 meters indoors.

Q: Can I power the board with a battery?
A: Yes, the board can be powered using an external battery connected to the VIN pin (3.3V to 5V).