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
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
1.ESP32-WROOM-32D 开发板
2. 3*4按键模块
3.SG90舵机
4.杜邦线
引脚依次为: 7 6 5 4 3 2 1(从左往右)
SG90 舵机的引脚图
引脚依次为:
1.VCC
2.PWM : 脉冲宽度调制
3.GND
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
#include <dummy.h>
#include <Servo.h>
#include <BLEDevice.h>
#include <BLE2902.h>
#include <String.h>
#include <Keypad.h>
#define SERVO_PIN 15
BLECharacteristic *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 keypad
Keypad 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55aa
op=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 service
pServer->getAdvertising()->start();// Start advertising
Serial.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0-9
pw[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
}
}
字段 | 帧头 | 标识 | 校验和 | 数据 |
---|---|---|---|---|
长度 | 2B | 1B | 1B | 16B |
帧头:55aa
标识:
10 : 蓝牙开门
20:设置密码
30:查看指纹
31:添加指纹
32:删除指纹
检验和:目前不做校验,填00即可
数据: 16字节,可以不填满
字段 | 帧头 | 标识 | 校验和 | 数据 |
---|---|---|---|---|
内容 | 55aa | 20 | 00 | 6B修改密码 |
蓝牙修改按键密码发送消息案例:55aa2000363534333231
ps:都是以16进制发送,对应相应的ASCII码
键盘分配0-9,*为回退键,#为确认键
代码烧录成功后,蓝牙发送55aa2000363534333231,修改密码为654321
键盘输入6 5 4 3 2 1 #(确认键)
如果密码不正确,则需显示密码错误;
如果密码正确,则会控制舵机转动来实现开锁操作