The LED segments of the display require current-limiting resistors when powered from a 5 V logic pin. The value of the resistor is typically between 330 and 470 ohms. And, driver transistors are ...

In case of any doubt refer this table. Push Switch (S1) input point is at pin 9 of the Arduino. Connecting the display pins directly to Arduino I/O pins is not a good practice. For testing purpose ...

BC759x series 7-segment LED display driver + keyboard interface chip provides a unified UART single-line LED display interface, this driver library can be applied to the following chips: BC7595 -- 48 ...