TM1638 GPIO Expansion Demo Board
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This is an 8-Bit Digital LED Tube 8-Bit TM1638 Key Display Module for Arduino. Which based on the TM1638 chip, this module gathers more than three common SCM peripheral circuits. Only three IO ports will be occupied when it drives and the MCU only needs to read the relevant register to send display data or test button, so it saves MCU resources effectively.