Temperature and humidity monitor solution based on MM32W wireless MCU series

Hardware resources are as follows:

Software resources are as follows:

The following is a brief introduction to several functions related to OLED operation:

// Initialize IIC

void IIC_Init(I2C_TypeDef* I2Cx);

// Send command function

static void Write_Command(unsigned char Command);

// Send data to display on the screen

static void Write_DataBuff(unsigned char *Data, unsigned char Len);

//OLED screen initialization

void OLED_Init(void);

// Set coordinates

void OLED_SetPos(unsigned char x, unsigned char y);

// String display

void OLED_DispStr(unsigned char x, unsigned char y, char *ch);

// Display logo

void OLED_DispLogo(void);

// Clear screen operation

void OLED_Clear(void);

The following is a brief introduction to several functions related to the operation of the DHT11 module:

//TIM3_CH2 input capture initialization

void CaptureInit(void); // Use TIM3_CH2 PB5 AF3

// Start capture

void CaptureStart(void);

// Stop capturing

void CaptureStop(void);

// After the Bluetooth connection is successful, the protocol will call this callback function when it is idle.

void gatt_user_send_notify_data_callback(void){ 

static u8 notiCnt = 0; // Callback times counter

u16 humiBat ,tempBpm = 0;

unsigned char DHTData[3]={0x00,0x00,0x01};

notiCnt++; // The callback count counter +1 for each entry of this function

if(CaptureDataMon(&humiBat, &tempBpm) == 0) return;// If the temperature and humidity data is not successfully collected, return immediately

tempBpm %= 512;// Preliminary judgment of temperature data size

humiBat /= 10; // Preliminary judgment of humidity data size

if (notiCnt >= 20) {// The temperature data will be sent only once every 20 times the callback function is entered.

notiCnt = 0;       

cur_notifyhandle = 0x12; // Temperature data reply handle value

if (tempBpm < 0x100){

DHTData[0] = 0; //1Byte

DHTData[1] = tempBpm;

sconn_notifydata(DHTData,2); // Convert and process the temperature data and send it out via Bluetooth

}

else {

DHTData[0] = 1; //2Byte

DHTData[1] = tempBpm;

DHTData[2] = tempBpm>>8;

sconn_notifydata(DHTData,3); // Convert and process the temperature data and send it out via Bluetooth

}

}

else if (10 == notiCnt) {// The humidity data is only sent once every 10 times the callback function is entered.

SimBatt = humiBat; //0~100

cur_notifyhandle = 0x18;// Humidity data reply handle value

sconn_notifydata(&SimBatt,1);// Convert and process the humidity data and send it out via Bluetooth

}

}

The mobile phone operation process is as follows: