The STM-32 NUCLEO-F401RE is a development board manufactured by STMicroelectronics, featuring the STM32F401RE microcontroller. It is part of the STM32 family and is designed to facilitate rapid prototyping and development of embedded applications. The board supports both Arduino Uno V3 and ST morpho headers, making it highly versatile and compatible with a wide range of expansion boards and shields.
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This circuit features a NUCLEO-F303RE microcontroller board interfaced with several modules for sensing, actuation, and communication. It uses I2C communication to display data on an LCD screen, UART communication to interface with an ESP8266 WiFi module, and reads an MQ-2 gas sensor via an ADC pin. The microcontroller also controls a buzzer for audible alerts and a relay module for switching higher power loads, possibly in response to sensor readings or remote commands received over WiFi.
This circuit features a NUCLEO-F303RE microcontroller board interfaced with various modules for sensing, actuation, and communication. It includes an MQ-2 gas sensor for detecting combustible gases, a buzzer for audible alerts, and a relay for controlling high-power devices. Additionally, the circuit uses an ESP8266 WiFi module for wireless connectivity and an I2C LCD display for user interface and data display.
This circuit features a STM32 Nucleo F303RE microcontroller interfaced with three HC-SR04 ultrasonic sensors for distance measurement and a 20x4 LCD display over I2C for data output. Additionally, there is a WS2812 RGB LED strip controlled by the microcontroller for visual feedback. The power supply provides a common 5V to the LCD, ultrasonic sensors, LED strip, and the microcontroller's +5V input, with all components sharing a common ground.
This circuit features an STM32 Nucleo 401RE microcontroller that controls a red LED through a 220-ohm resistor. The LED's cathode is connected to ground, and its anode is connected to the microcontroller via the resistor, allowing the microcontroller to manage the LED's state.
Operating Voltage: 3.3V (core), 5V (I/O via Arduino headers)
Input Voltage: 7V to 12V (via VIN pin or external power supply)
Connectivity: USB (Micro-B), USART, I2C, SPI
Clock Speed: 84 MHz
Debugging Interface: ST-LINK/V2-1 (onboard)
Dimensions: 68.6 mm x 53.3 mm
Compatibility: Arduino Uno V3 headers, ST morpho headers
Pin Configuration and Descriptions
The STM-32 NUCLEO-F401RE features multiple pin headers for connectivity. Below is a summary of the pin configuration:
Arduino Uno V3 Header Pinout
Pin Name
Function
Description
VIN
Power Input
External power input (7V-12V)
5V
Power Output
5V output from onboard regulator
3.3V
Power Output
3.3V output
GND
Ground
Ground connection
A0-A5
Analog Input
6 analog input pins
D0-D13
Digital I/O
14 digital I/O pins (D0-D1 for UART)
PWM
PWM Output
PWM-capable pins (e.g., D3, D5, D6, D9)
SDA/SCL
I2C Communication
I2C data (SDA) and clock (SCL) lines
RX/TX
UART Communication
UART receive (RX) and transmit (TX) pins
ST Morpho Header Pinout
Pin Name
Function
Description
VDD
Power Supply
3.3V power supply
GND
Ground
Ground connection
PAx, PBx
GPIO
General-purpose I/O pins
USARTx
UART Communication
UART transmit and receive lines
SPIx
SPI Communication
SPI clock, MISO, MOSI, and NSS lines
I2Cx
I2C Communication
I2C data (SDA) and clock (SCL) lines
ADCx
Analog Input
Analog-to-digital converter inputs
Usage Instructions
How to Use the Component in a Circuit
Powering the Board:
Connect the board to your computer via the Micro-USB port for power and programming.
Alternatively, use an external power supply (7V-12V) via the VIN pin or the barrel jack.
Programming the Board:
Install the STM32CubeIDE or Arduino IDE with the STM32 core.
Connect the board to your computer using a USB cable.
Select the appropriate board and port in your IDE.
Write and upload your code to the board.
Connecting Peripherals:
Use the Arduino headers for shields or the ST morpho headers for custom peripherals.
Ensure proper voltage levels and pin configurations for connected devices.
Debugging:
Use the onboard ST-LINK/V2-1 debugger for real-time debugging and programming.
Important Considerations and Best Practices
Ensure the input voltage does not exceed the specified range (7V-12V) to avoid damage.
Use level shifters when interfacing 5V logic devices with the 3.3V GPIO pins.
Avoid drawing excessive current from the 3.3V or 5V pins to prevent overheating.
Always verify pin configurations and connections before powering the board.
Example Code for Arduino IDE
Below is an example code to blink an LED connected to pin D13:
// Blink an LED on pin D13 of the STM-32 NUCLEO-F401RE
void setup() {
pinMode(13, OUTPUT); // Set pin D13 as an output
}
void loop() {
digitalWrite(13, HIGH); // Turn the LED on
delay(1000); // Wait for 1 second
digitalWrite(13, LOW); // Turn the LED off
delay(1000); // Wait for 1 second
}
Troubleshooting and FAQs
Common Issues and Solutions
The board is not detected by the computer:
Ensure the USB cable is functional and supports data transfer.
Check that the ST-LINK drivers are installed on your computer.
Code upload fails:
Verify that the correct board and port are selected in the IDE.
Ensure no other application is using the COM port.
Reset the board by pressing the reset button and try again.
Peripherals are not working as expected:
Double-check the pin connections and configurations.
Ensure the peripherals are compatible with the board's voltage levels.
The board overheats:
Check for short circuits or excessive current draw from the power pins.
Ensure the input voltage is within the specified range.
FAQs
Q: Can I use the STM-32 NUCLEO-F401RE with the Arduino IDE?
A: Yes, the board is compatible with the Arduino IDE. Install the STM32 core to program it using Arduino libraries.
Q: What is the maximum current output of the 3.3V and 5V pins?
A: The 3.3V pin can supply up to 100 mA, and the 5V pin can supply up to 500 mA when powered via USB.
Q: How do I reset the board?
A: Press the onboard reset button to restart the microcontroller.
Q: Can I use the board for low-power applications?
A: Yes, the STM32F401RE microcontroller supports low-power modes for energy-efficient applications.
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