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The STM32 Blue Pill (STM32F103C8T6) can interface with a 16x2 LCD module using the I2C protocol (recommended) or direct GPIO connections. Below are steps for both methods.

🛠️ 1. Components Required

STM32 Blue Pill (STM32F103C8T6)
16x2 LCD Module
I2C LCD Adapter Module (for I2C method)
Breadboard
Jumper Wires

📌 Method 1: Using I2C Interface (Recommended)

⚡ Pin Connections (I2C Adapter on LCD)

I2C LCD Pin	STM32 Pin	Description
VCC	3.3V	Power Supply
GND	GND	Ground
SDA	PB7	I2C Data Line
SCL	PB6	I2C Clock Line

📦 Install Required Libraries

In Arduino IDE, go to:

Sketch > Include Library > Manage Libraries
Search and install:
- LiquidCrystal_I2C

💻 I2C LCD Code Example

cpp

#include <Wire.h>


#include <LiquidCrystal_I2C.h>

// Initialize the LCD with I2C address (default: 0x27 or 0x3F)

LiquidCrystal_I2C lcd(0x27, 16, 2);

 

void setup() {

lcd.init(); // Initialize the LCD


  lcd.backlight();     // Turn on the backlight

  lcd.setCursor(0, 0); // Set cursor to first row, first column

lcd.print("STM32 + LCD");

 
  lcd.setCursor(0, 1); // Set cursor to second row

  lcd.print("Hello World!");

void loop() {

// Nothing in the loop for now

🚀 Upload and Test

Select Generic STM32F103C Series in Tools > Board.
Ensure Upload Method: is set to STM32CubeProgrammer (SWD) or Serial.
Upload the code.
You should see the text "STM32 + LCD" and "Hello World!" displayed.

📌 Method 2: Direct GPIO Interface (Without I2C)

If you're not using an I2C module, connect the LCD directly to GPIO pins.

⚡ Pin Connections (Direct GPIO)

LCD Pin	STM32 Pin	Description
VSS	GND	Ground
VCC	3.3V	Power
VEE	Potentiometer (for contrast)	Contrast Control
RS	PA0	Register Select
RW	GND	Read/Write (GND for Write mode)
E	PA1	Enable
D4	PA2	Data Bit 4
D5	PA3	Data Bit 5
D6	PA4	Data Bit 6
D7	PA5	Data Bit 7
A	3.3V	LED Anode
K	GND	LED Cathode

📦 Install Required Library

Go to Sketch > Include Library > Manage Libraries.
Search and install:
- LiquidCrystal

💻 GPIO LCD Code Example

🚀 Upload and Test

Select Generic STM32F103C Series in Tools > Board.
Upload the code.
Text "STM32 + LCD" and "Direct GPIO!" should display on the screen.

🛡️ Troubleshooting

I2C Issue: Check the I2C address (0x27 or 0x3F). Use an I2C Scanner sketch to verify.
Display Issue: Adjust the contrast potentiometer on the LCD.
Wiring: Double-check pin connections.
Ensure STM32 drivers are correctly installed in Arduino IDE.

How to connect STM32 Blue Pill with 16x2 character LCD module using Arduino IDE?

🛠️ 1. Components Required

📌 Method 1: Using I2C Interface (Recommended)

⚡ Pin Connections (I2C Adapter on LCD)

📦 Install Required Libraries

💻 I2C LCD Code Example

🚀 Upload and Test

📌 Method 2: Direct GPIO Interface (Without I2C)

⚡ Pin Connections (Direct GPIO)

📦 Install Required Library

💻 GPIO LCD Code Example

🚀 Upload and Test

🛡️ Troubleshooting