https://www.instructables.com/CD4543-7-segment-Decoder-for-Common-Cathode-CC-and/
CD4543 7-segment Decoder for Common Cathode (CC) and Common Anode (CA) Displays - Instructables
CD4543 7-segment Decoder for Common Cathode (CC) and Common Anode (CA) Displays: This project demonstrates how to use the CD4543 7-segment decoder driver chip...