Introduction - If you have any usage issues, please Google them yourself
(1) methyl P1 port of the switch control unit P1 port B light-emitting diode, light emitting diode switch is closed, switch off the light-emitting diode off.
(2) B machine P2 port port key control A machine P2 digital tube, press the P2.0 P2.7 buttons, display the corresponding keys 0-7