1,8 keys ,

2, 8 LED

3,8 -bit digital control, common cathode LED digital tube ;

4 , such as STC microcontroller can be directly connected ;

5 , to provide the driver ardiuno ;

The module is used in chip TM1638, a collection of these three common MCU peripheral circuit , the biggest feature is just take three microcontroller IO port to drive , do not need to scan display and key scanning microcontroller intervention , only need to read the relevant register send display data or test button , save MCU resources. Buy this module provides sample program .

Imagine , we usually use an external microcontroller 8 LED, 8 digital tube , eight keys which will occupy the number of IO ports , far more than three IO mouth it , but with this module can be achieved. The practical application of key sensitive display good results.

Connection:

VCC GND connected to 5V power supply , STB CLK DIO connected microcontroller IO port .