Voice Recognition safebox V1.0（声纹保险箱）
By Hardi(黄昊)&肖煜瀚 @MG_summer_camp 产品设计营 2019.08.09
WARNING!!!! To use this program, please make sure you already installed the LD3320 voice Recognition module arduino library
The safebox has two method to open the door, we can either use our secret phrase to unlock it, or we can input our password on the keyboard to unlock the device
the password is four digit, and using "#" to clear the input, and "*" to comfirm the input, and the door will be open if the password is correct.
by pushing down and hold the voice enable button, we can use our secret phrase to open the door as well.