I have connected the DIN pin of the module with the SDA (PB5) and SCL(PB4) pin of the STM8S103F3P6 board. I have also provided a 5V power supply to both the sensor and the LCD. Please note ... bit ...

You can use Max7219.cs in your project to drive a Max7219 based Dot Matrix Module. Write to a 8x8 Dot Matrix Module demonstrates a concrete example using this class. The following fritzing diagram ...