Features:

• 8 Bits, 8 keys, 8 LEDs, 8 digital tubes, common cathode LED digital tube.
• TM1638 Chip, this module gathers more than three common SCM peripheral circuits.
• The advantage is only three IO ports will be occupied when it drives.
• SCM does not need to work for scanning display and key scanning.
•  Only needs to read the relevant register to send display data or test button so it saves MCU resources effectively.
• Keys are sensitive and the display is effective.