4×4键盘及8位数码管显示构成的电子密码锁是通过键盘输入密码，然后通过数码管显示!-4 × 4 keyboard and 8-bit digital tube display constituted by an electronic lock keypad to enter a password, and then LED display!

安卓手机蓝牙串口通信 手机蓝牙控制小车 手机蓝牙控制飞机 手机蓝牙密码锁-Android phones Bluetooth serial communication Bluetooth mobile phone control car Bluetooth mobile phone control aircraft Bluetooth phone lock