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STM32 Nucleo F401RE Development Board

The STM32 Nucleo boards are the official Development Boards from STMicroelectronics. It features the ARM Cortex M4 32-bit STM32F401RET6 microcontroller which is in LQFP64 package. The Boards pinout is similar to Arduino UNO and has many other additional pins to expand performance. This board also comes with an integrated ST-LINK/V2-1 programmer and debugger; hence it is very easy to get started with this board.

STM32 Nucleo-F401RE

As shown in the image above, there are three LEDs, where LD1 is for indicating USB communication, LD2 is programmable LED, and LD3 indicates power. Similarly, there are two push buttons where one is user programmable, and the other is to reset the Microcontroller. The Board operates with 3.3V supply but a wide voltage range of 7-12V can be provided to the VIN pin since it has an on-board voltage regulator.


Nucleo-F401RE Pinout Configuration

The STM32 Nucleo board pinout is shown above. As you can see, there are two sets of pins. The pin one resembles the Arduino UNO and the blue one is the STM32 style (Morpho). The arduino like pins are female connector pins which exactly match the order and position of Arduino UNO pins and hence any Arduino shield can be used with these development boards.

The Arduino pins are split into category CN5, CN6, CN8, and CN9. Each category pin can be tabulated as follows:

Pin Category

Pin Type

Pin names





3.3V Reference Voltage pin


Resets the Microcontroller


Provides 3.3V as output can also be used to power the MCU


5V output only pin


Ground pins


Analog Pins and I2C


Used to measure Analog Voltage

A4 and A5

These pins can also be used for I2C Communication A4 is SDA and A5 is SCL


Digital Pins and SPI


Digital GPIO pins


Can be used to provide analog reference voltage


Ground Pins

D13, D12. D11 and D10

Acts as SCK, MISO, MOSI and CS pins respectively for SPI communication


Digital Pins and USART

D0 to D7

Digital GPIO pins

D0 and D1

Acts as Rx and Tx pins respectively for USART communication


Apart from the Arduino pins, the board also has 76 (38+38) GPIO pins as male headers on either side of the board as shown above. These pins are classified into CN7 and CN10 with each having 38 Pins. They comprise of GPIO pins, Analog Pins, Timer Pins, and Power pins. The name of the pins can be found in the image above. They are also categorized with the table below:

Pin Category

Pin Type

Pin names



Port pins

PC0, PC1, PC2, PC3, PC10, PC11, PC12, PC13, PC14, PC15

Port C digital I/O pins


Port D I/O pin

PA0, PA1, PA4, PA13, PA14, PA15

Port A I/O pins

PB7, PB8 and PB9

Port B I/O pin

PH0 and PH1

Port H I/O pins



Can be used to power them module from battery


Provides 3.3V as output can also be used to power the MCU


5V output only pin


Unregulated input power pin


Resets the MCU


Reference Voltage Pin


Port Pins

PC4, PC5, PC6, PC7, PC8, PC9

Port C I/O Pins

PA2, PA3, PA4, PA6, PA7, PA10, PA11 and PA12

Port A I/O Pins

PB1, PB2, PB3, PB4, PB5, PB6, PB8, PB9, PB10, PB12, PB14, PB15

Port B I/O Pins



5V Power Pin


System Ground of the MCU


Analog Ground Pin


Technical Specifications


STM32F401RET6 (32-bit)


ARM Cortex M4 CPU with FPU

Power consumption

2.4uA at standby without RTC

CPU Frequency

84 MHz

Crystal Oscillator Range

4 to 26 MHz

MCU Operating Voltage (VDD)

1.7V to 3.6V

Board Operating Voltage (VIN)

7V to 15V

Flash Memory



96 KB




12-bit 16Channel


In-built 32kHz with calibration


16-bit (6)

32-bit (2)

Watchdog Timers


USART/UART Communication


I2C Communication


SPI Communication


USB2.0 Support


Internal Crystal Oscillator

Yes, 16MHz

On Board Debugger

Yes, Serial Wire and JTAG


Note: More technical information can be found in the STM32 Nucleo-F401RE Datasheet, linked at the bottom of this page.


Other Development Boards

Arduino UNO, Arduino Pro Mini, Arduino Mega, Arduino Due, Arduino Leonardo, Raspberry Pi, PIC Development Board, AVR Development Board, MSP430 Launchpad, Intel Edison, ESP32


How to Program STM32 Nucleo Boards

The Nucleo Development Board is relatively easy to get started and learn since it has an in-built programmer and debugger. The Board can be programmed with many Development tool chains which are listed below:

  1. Keil MDK-ARM
  2. IAR Workbench
  3. GCC based IDE
  4. ARM Mbed (online)

Out of these, the Keil MDK is the most used one. It is beginner friendly and on top of that, it is free to use, just download the IDE and its respective drive from link below.

Software: Keil MDK Version 5

Driver: Nucleo USB Driver



The STM32 MCUs are commonly used in many industrial and commercial products these days. Some specific application include-

  • Low Power portable Electronics
  • Robotics
  • System Automation
  • IOT


2D Model and Dimensions

STM32 Nucleo-F401RE Dimensions

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