P2 port connector at one end grounded keys 8 as input, of course, need to connect 8 10k resistor to the power supply as the pull-up resistor.

P 2口连接8个一端接地的按键作为输入，当然也需要连接8只10K的电阻至电源作为上拉电阻。

youdao

P2 port connector at one end grounded keys 8 as input, of course, need to connect 8 10k resistor to the power supply as the pull-up resistor.

P 2口连接8个一端接地的按键作为输入，当然也需要连接8只10K的电阻至电源作为上拉电阻。

youdao