arduino怎么加密（Arduino利用44矩阵键盘来实现输入密码功能）

弄清楚类比于手机锁屏密码的模式，使用Arduino利用4*4矩阵键盘来实现输入密码功能，利用EEPROM实现保存密码功能。

本次完成的内容需要的材料：

Arduino UNO

一块4*4矩阵键盘

一个LED灯

导线（若干）

线路图：

实验所用的代码：

/* @file CustomKeypad.pde || @version 1.0 || @author Alexander Brevig || @contact alexanderbrevig@gmail.com || || @description || | Demonstrates changing the keypad size and key values. || # */ #include "Keypad.h" #include <EEPROM.h> const byte ROWS = 4; //four rows const byte COLS = 4; //four columns //define the cymbols on the buttons of the keypads char hexaKeys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad //initialize an instance of class NewKeypad Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); int pass; void setup(){ Serial.begin(115200); pinMode(13,OUTPUT); pass = EEPROM.read(0); Serial.println(pass); delay(500); } void loop(){ char customKey = customKeypad.getKey(); if (customKey){ Serial.println(customKey); digitalWrite(13, LOW); } if(customKey == 'A') { int a,b,c,d,q,i=0; while(1) { char customKey = customKeypad.getKey(); if (customKey){ Serial.println(customKey); } if(i == 0&&customKey&&customKey!='#') a = (int)(customKey)-48; if(i == 1&&customKey) { b = (int)(customKey)-48; } if(i == 2&&customKey) c = (int)(customKey)-48; if(i == 3&&customKey){ d = (int)(customKey)-48; } if(customKey == '*') a=b=c=d=q=i=0; else if(customKey == '#') { q = a*1000 b*100 c*10 d; EEPROM.write(0,q); delay(100); pass = EEPROM.read(0); Serial.println(pass); break; } if(customKey == '0'||customKey == '1'||customKey == '2'||customKey == '3'||customKey == '4'||customKey == '5'||customKey == '6'||customKey == '7'||customKey == '8'||customKey == '9') { i ; if(i == 4) {i = 0;} } } } if(customKey == 'B') { int a,b,c,d,q,i=0; char customKey = ' '; while(1) { char customKey = customKeypad.getKey(); if (customKey){ Serial.println(customKey); } if(i == 0&&customKey&&customKey!='#') a = (int)(customKey)-48; if(i == 1&&customKey) { b = (int)(customKey)-48; } if(i == 2&&customKey) c = (int)(customKey)-48; if(i == 3&&customKey){ d = (int)(customKey)-48; } if(customKey == '0'||customKey == '1'||customKey == '2'||customKey == '3'||customKey == '4'||customKey == '5'||customKey == '6'||customKey == '7'||customKey == '8'||customKey == '9') { i ; if(i == 4) {i = 0;} } if(customKey == '*'){ a=b=c=d=q=i=0; } else if(customKey == '#') { Serial.println(a); Serial.println(b); Serial.println(c); Serial.println(d); q = a*1000 b*100 c*10 d; if(q == pass) { Serial.println("sucess"); digitalWrite(13, HIGH); break; } else { a=b=c=d=q=i=0; } } } } }