STM32 TM1637 4-Digit Display Interface

Project Description

This project demonstrates how to interface a TM1637 4-digit 7-segment display with an STM32F103C6 microcontroller using GPIO bit-banging.

The TM1637 allows easy numeric display output with programmable brightness control. By using STM32 GPIOs for communication, this setup provides a lightweight solution without requiring dedicated hardware interfaces. The project includes full Proteus simulation support for validation and testing.

STM32CubeMX Setup

• MCU Selection: STM32F103C6 (8 MHz clock)
• GPIO Configuration:

- PA0 → CLK (Output Push-Pull)

- PA1 → DIO (Output Push-Pull)

• Generate initialization code and open the project in STM32CubeIDE.

STM32CubeIDE Setup

Key Functions

• Display Initialization
• -void TM1637_Init(void);
• -Configures CLK/DIO timing.
• Display Decimal Value

-void TM1637_DisplayDecimal(int value, bool showColon);

• Set Brightness

-void TM1637_SetBrightness(uint8_t level);

• Main Loop exemple

TM1637_Init();
TM1637_SetBrightness(7);
while (1)
{
TM1637_DisplayDecimal(1234, true);
HAL_Delay(1000);
}

Proteus Simulation

Required Components:

• STM32F103C6 microcontroller
• TM1637 4-digit display
• Pull-up resistors (10 kΩ on CLK and DIO)

Connections:

• PA0 → CLK pin of TM1637
• PA1 → DIO pin of TM1637
• VCC → 5V
• GND → GND

Steps:

• Load the.hex file generated from STM32CubeIDE.
• Run the simulation.
• Observe numeric output and brightness control on the TM1637 display.

That's all!

If you have any questions or suggestions don't hesitate to leave a comment below