实训8——蓝牙修改开锁密码

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实训八 : 蓝牙修改开锁密码

一、实验目的

通过ESP32,按键模块和SG90舵机,实现蓝牙发送相应的命令修改按键密码

二、实验内容

1.连接ESP32和按键模块的引脚,以及ESP32和SG90舵机的引脚
2.从键盘输入密码,ESP32获取到所输入的密码并判断是否正确
3.密码验证正确后,ESP32控制舵机的转动

三、实验设备

1.ESP32-WROOM-32D 开发板
2. 3*4按键模块
3.SG90舵机
4.杜邦线

四、实验步骤

1) 连接引脚

3*4矩阵键盘

按键模块

引脚依次为: 7 6 5 4 3 2 1（从左往右）

SG90 舵机

SG90 舵机的引脚图

引脚依次为:
1.VCC
2.PWM : 脉冲宽度调制
3.GND

连接图

在这里插入图片描述

2) 环境配置

1.下载适用于ESP32的电机驱动的库 Servo.h，下载链接：**https://github.com/RoboticsBrno/ESP32-Arduino-Servo-Library **
2.打开Arduino IDE,选择左上角工具–开发板,选择对应的开发板(ESP32 Dev Module)
3.选择工具–端口 , 选择对应的端口

3) 测试代码

#include <dummy.h>
#include <Servo.h>
#include <BLEDevice.h>
#include <BLE2902.h>
#include <String.h>
#include <Keypad.h>
#define SERVO_PIN 15BLECharacteristic *pCharacteristic;
bool deviceConnected = false;
#define SERVICE_UUID           "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"   
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
#define openInterval  5000 
const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {{'1','2','3'},{'4','5','6'},{'7','8','9'},{'*','0','#'}
};
byte rowPins[ROWS] = {33, 27, 14, 12}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {4, 0, 2}; //connect to the column pinouts of the keypadKeypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
byte ble_rx_buffer[20]; //接收蓝牙指令
byte verfi_code[6] = {0x31,0x32,0x33,0x34,0x35,0x36};//初始密码
byte init_pw[6] = {1,2,3,4,5,6};//初始按键密码
Servo myservo;
int pos=0;
bool toggle; //开锁判断位
void locker(bool toggle) { //开锁myservo.attach(SERVO_PIN); if (toggle) {myservo.write(90); // 开锁} else {myservo.write(0); // 关锁}delay(250); // 等马达转到定位myservo.detach();
}
class MyServerCallbacks: public BLEServerCallbacks {void onConnect(BLEServer* pServer) {deviceConnected = true;};void onDisconnect(BLEServer* pServer) {deviceConnected = false;}
};
/*相应的命令帧例子* 55aa1000313233343536 蓝牙发送开门指令，hex 16进制发送* 55aa2000363534333231 蓝牙修改密码指令
*/
class MyCallbacks: public BLECharacteristicCallbacks {void onWrite(BLECharacteristic *pCharacteristic) {std::string rxValue = pCharacteristic->getValue(); byte op;for (int i = 0; i < rxValue.length(); i++){ble_rx_buffer[i] = rxValue[i];Serial.print(rxValue[i]);}if(ble_rx_buffer[0] == 0x55 && ble_rx_buffer[1] == 0xaa){ //匹配帧头55aaop=ble_rx_buffer[2];switch(op){ //标识位case 0x10:{ //蓝牙开门if(memcmp(ble_rx_buffer+4,verfi_code,6) == 0){ //匹配成功toggle = true;  Serial.println("开门成功");     }else{Serial.println("密码错误");}break;}case 0x20:{ //设置按键密码static byte temp_pw[6]; //临时密码for(byte i=0;i<6;i++){ if(ble_rx_buffer[i+4]<=0x39 && ble_rx_buffer[i+4]>=0x30){ //保证密码在0-9之间 temp_pw[i]=ble_rx_buffer[i+4]-0x30; }else{ //无效字符break;}if(i==5){ //密码修改完成Serial.println("密码修改完成");memcpy(init_pw,temp_pw,6); }}break;}case 0x30:{ //查看指纹break;}case 0x31:{//添加指纹break;}case 0x32:{ //删除指纹break;}}//locker(toggle);}}
};void setupBLE(String BLEName){           //连接蓝牙const char *ble_name = BLEName.c_str();       BLEDevice::init(ble_name);                    BLEServer *pServer = BLEDevice::createServer(); //创建服务pServer->setCallbacks(new MyServerCallbacks());BLEService *pService = pServer->createService(SERVICE_UUID);    pCharacteristic = pService->createCharacteristic(CHARACTERISTIC_UUID_TX,BLECharacteristic::PROPERTY_NOTIFY);  pCharacteristic->addDescriptor(new BLE2902());  //添加描述BLECharacteristic *pCharacteristic = pService->createCharacteristic(CHARACTERISTIC_UUID_RX,BLECharacteristic::PROPERTY_WRITE);pCharacteristic->setCallbacks(new MyCallbacks());  //receive message callback  pService->start();// Start the servicepServer->getAdvertising()->start();// Start advertisingSerial.println("Waiting a client connection to notify...");
}void compare_pw(char key){static byte pw[20];static byte keys_len = 0;if(key){Serial.println(key);switch(key){case '#':{ //确认键if(keys_len == 6 && memcmp(pw,init_pw,6)==0){  //匹配成功,开锁Serial.println("开门成功");toggle = true; }else{Serial.println("密码错误");}keys_len=0; //清零break;}case '*':{ //回退键if(keys_len >0)keys_len--;break;}default:{ //默认数字键0-9pw[keys_len++]=key-'0';if(keys_len>19){Serial.println("OverSize");keys_len=0;}break;}}}
}
void setup() { Serial.begin(115200);setupBLE("ESP32 Device");//设置蓝牙名称myservo.attach(SERVO_PIN); //引脚12为PWM脚  
}
void loop() {static unsigned long toggle_time = millis();static bool lock_back_flag=false;compare_pw(keypad.getKey()); //比对按键输入密码if(toggle){ //开门计时locker(toggle); //开锁toggle = false;lock_back_flag = true;toggle_time = millis();}if(millis() - toggle_time > openInterval && lock_back_flag){  //回锁时间lock_back_flag = false;locker(toggle);//回锁}
}