Wiring
The DIN, CS, and CLK pins can be connected to any digital or analog input pin on the board.
Warning
MAX7219 modules are sensitive to poor electrical connections and low voltage.
Always use high-quality cables and an external +5V power source when connecting these modules to a board. When chaining multiple MAX7219 modules do not daisy-chain the +5V power.
The DIO and CLK pins can be connected to any digital or analog input pin on the board. TM1637 modules cannot be connected in series.
