ESP32连接米家蓝牙温湿度计(项目半成品)

ESP32连接米家蓝牙温湿度计(项目半成品)
在2018年折腾过一次用米家温湿度连接ESP32上用OLED显示,OLED显示是已经成功了.可是当时打算让EPS在读取到蓝牙温度计数值后上传到blynk,可是编译后提示空间不足(即使不要OLED驱动只接入blynk也一样)。由于我不是专业开发人员，也没时间去找解决方法。同时，觉得这功能大把东西可以取代,搞出来觉得没啥用,所以代码一直仍在硬盘里直到现在才记得.这里顺便发出来,大家觉得有用的话拿去研究参考,看能不能解决空间问题，运行效果如下:
ESP32连接米家蓝牙温湿度计(项目半成品)
这个项目灵感主要来自于这位作者，https://github.com/turlvo/KuKuMi,有兴趣可以看看。

软件和环境
- PlatformIO 或者Arduino IDE配置好ESP32 Arduino架构板库
- Adafruit SSD1306 OLED 库
- Adafruit GFX 库
  以上库都可以在IDE内搜索到

硬件准备	项目名称	数量	单位
ESP32	1	块	这里用`doit esp32 devkit v1`
0.96’OLED液晶模块	1	个	SSD1306主控,建议I2C版本，我这里用SPI接口版本
小米米家蓝牙温湿度计	1	个	我这里使用的是旧版圆形那个版本，由于已经是3年前，现在新款的版本不知道行不行
杜邦线	若干
面包板	1	块

3.注意事项
在开始动手前，请你把周边所有蓝牙（如手机蓝牙等）设备关掉，以免影响ESP32的实验结果。

ESP32	15	2	4	5	GND	3.3V/5V	GND
OLED	CLK(SCK)	MOSI(SCK)	RESET(RES)	DC	CS	VCC	GND

（省略，请自行看Adafruit SSD1306 OLED 库中的示例）

这里是SPI OLED的版本：

 #include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "soc/soc.h"
#include "soc/rtc_cntl_reg.h"
#include "esp_system.h"
#include <sstream>
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
 
#define SCAN_TIME  10 //扫描的间隔10秒
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
 
boolean METRIC = true; //不需要公制单位的话设为：false 
 
BLEScan *pBLEScan;
 
void IRAM_ATTR resetModule() {
  ets_printf("reboot\n");
  esp_restart();
}
 
#define OLED_CLK    15
#define OLED_MOSI   2
#define OLED_RESET  4
#define OLED_DC     5
#define OLED_CS     255
 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
 
float  current_humidity = -100;
float  previous_humidity = -100;
float current_temperature = -100;
float previous_temperature = -100;
 
class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice)
    {
      if (advertisedDevice.haveName() && advertisedDevice.haveServiceData() && !advertisedDevice.getName().compare("MJ_HT_V1")) {
        std::string strServiceData = advertisedDevice.getServiceData();
        uint8_t cServiceData[100];
        char charServiceData[100];
 
        strServiceData.copy((char *)cServiceData, strServiceData.length(), 0);
 
        Serial.printf("\n\nAdvertised Device: %s\n", advertisedDevice.toString().c_str());
 
        for (int i = 0; i < strServiceData.length(); i++) {
          sprintf(&charServiceData[i * 2], "%02x", cServiceData[i]);
        }
 
        std::stringstream ss;
        ss << "fe95" << charServiceData;
 
        Serial.print("Payload:");
        Serial.println(ss.str().c_str());
 
        char eventLog[256];
        unsigned long value, value2;
        char charValue[5] = {0,};
        switch (cServiceData[11]) {
          case 0x04:
            sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
            value = strtol(charValue, 0, 16);
            if (METRIC)
            {
              current_temperature = (float)value / 10;
            } else
            {
              current_temperature = CelciusToFahrenheit((float)value / 10);
            }
            break;
          case 0x06:
            sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
            value = strtol(charValue, 0, 16);
            current_humidity = (float)value / 10;
            Serial.printf("HUMIDITY_EVENT:");
            Serial.printf(charValue, value);
            Serial.println();
            break;
          case 0x0A:
            sprintf(charValue, "%02X", cServiceData[14]);
            value = strtol(charValue, 0, 16);
            Serial.printf("BATTERY_EVENT:");
            Serial.printf(charValue, value);
            Serial.println();
            break;
          case 0x0D:
            sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
            value = strtol(charValue, 0, 16);
            if (METRIC)
            {
              current_temperature = (float)value / 10;
            } else
            {
              current_temperature = CelciusToFahrenheit((float)value / 10);
            }
            Serial.printf("TEMPERATURE_EVENT:");
            Serial.printf(charValue, value);
            Serial.println();
            sprintf(charValue, "%02X%02X", cServiceData[17], cServiceData[16]);
            value2 = strtol(charValue, 0, 16);
            current_humidity = (float)value2 / 10;
            Serial.printf("HUMIDITY_EVENT:" );
            Serial.printf(charValue, value2);
            Serial.println();
            break;
        }
      }
    }
};
 
void setup() {
  display.begin(SSD1306_SWITCHCAPVCC);
  //清楚OLED屏幕缓存
  display.clearDisplay();
  display.display();
 
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); 
 
  Serial.begin(115200);
  Serial.println("ESP32 XIAOMI DISPLAY");
 
  initBluetooth();
}
 
void loop() {
  char printLog[256];
  Serial.printf("Start BLE scan for %d seconds...\n", SCAN_TIME);
  BLEScanResults foundDevices = pBLEScan->start(SCAN_TIME);
  int count = foundDevices.getCount();
  printf("Found device count : %d\n", count);
  delay(100);
 
  displayTemperature();
}
 
void initBluetooth()
{
  BLEDevice::init("");
  pBLEScan = BLEDevice::getScan(); //create new scan
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true); //active scan uses more power, but get results faster
  pBLEScan->setInterval(0x50);
  pBLEScan->setWindow(0x30);
}
 
void displayTemperature() {
  if (current_temperature != previous_temperature) {
    previous_temperature = current_temperature;
    previous_humidity = current_humidity;
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(0, 0);
    display.print("Tem:");
    display.print(convertFloatToString(current_temperature));
    if (METRIC) {
      display.setCursor(115, 0);
      display.print("C");
    } else {
      display.setCursor(115, 0);
      display.print("F");
    }
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(0, 40);
    display.print("Hum:");
    display.print(current_humidity, 1);
    display.print(" %");
    display.display();
  }
}
 
String convertFloatToString(float f)
{
  String s = String(f, 1);
  return s;
}
 
//转换成华氏的自定义函数
float CelciusToFahrenheit(float Celsius)
{
  float Fahrenheit = 0;
  Fahrenheit = Celsius * 9 / 5 + 32;
  return Fahrenheit;
}

ESP32连接米家蓝牙温湿度计(项目半成品)

事前准备

硬件接线

SPI版本

I2C版本

Arduino代码

	#include <SPI.h>
	#include <Adafruit_GFX.h>
	#include <Adafruit_SSD1306.h>
	#include "soc/soc.h"
	#include "soc/rtc_cntl_reg.h"
	#include "esp_system.h"
	#include <sstream>
	#include <BLEDevice.h>
	#include <BLEUtils.h>
	#include <BLEScan.h>
	#include <BLEAdvertisedDevice.h>

	#define SCAN_TIME 10 //扫描的间隔10秒
	#define SCREEN_WIDTH 128
	#define SCREEN_HEIGHT 64

	boolean METRIC = true; //不需要公制单位的话设为：false

	BLEScan *pBLEScan;

	void IRAM_ATTR resetModule() {
	ets_printf("reboot\n");
	esp_restart();
	}

	#define OLED_CLK 15
	#define OLED_MOSI 2
	#define OLED_RESET 4
	#define OLED_DC 5
	#define OLED_CS 255

	Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

	float current_humidity = -100;
	float previous_humidity = -100;
	float current_temperature = -100;
	float previous_temperature = -100;

	class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
	void onResult(BLEAdvertisedDevice advertisedDevice)
	{
	if (advertisedDevice.haveName() && advertisedDevice.haveServiceData() && !advertisedDevice.getName().compare("MJ_HT_V1")) {
	std::string strServiceData = advertisedDevice.getServiceData();
	uint8_t cServiceData[100];
	char charServiceData[100];

	strServiceData.copy((char *)cServiceData, strServiceData.length(), 0);

	Serial.printf("\n\nAdvertised Device: %s\n", advertisedDevice.toString().c_str());

	for (int i = 0; i < strServiceData.length(); i++) {
	sprintf(&charServiceData[i * 2], "%02x", cServiceData[i]);
	}

	std::stringstream ss;
	ss << "fe95" << charServiceData;

	Serial.print("Payload:");
	Serial.println(ss.str().c_str());

	char eventLog[256];
	unsigned long value, value2;
	char charValue[5] = {0,};
	switch (cServiceData[11]) {
	case 0x04:
	sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
	value = strtol(charValue, 0, 16);
	if (METRIC)
	{
	current_temperature = (float)value / 10;
	} else
	{
	current_temperature = CelciusToFahrenheit((float)value / 10);
	}
	break;
	case 0x06:
	sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
	value = strtol(charValue, 0, 16);
	current_humidity = (float)value / 10;
	Serial.printf("HUMIDITY_EVENT:");
	Serial.printf(charValue, value);
	Serial.println();
	break;
	case 0x0A:
	sprintf(charValue, "%02X", cServiceData[14]);
	value = strtol(charValue, 0, 16);
	Serial.printf("BATTERY_EVENT:");
	Serial.printf(charValue, value);
	Serial.println();
	break;
	case 0x0D:
	sprintf(charValue, "%02X%02X", cServiceData[15], cServiceData[14]);
	value = strtol(charValue, 0, 16);
	if (METRIC)
	{
	current_temperature = (float)value / 10;
	} else
	{
	current_temperature = CelciusToFahrenheit((float)value / 10);
	}
	Serial.printf("TEMPERATURE_EVENT:");
	Serial.printf(charValue, value);
	Serial.println();
	sprintf(charValue, "%02X%02X", cServiceData[17], cServiceData[16]);
	value2 = strtol(charValue, 0, 16);
	current_humidity = (float)value2 / 10;
	Serial.printf("HUMIDITY_EVENT:" );
	Serial.printf(charValue, value2);
	Serial.println();
	break;
	}
	}
	}
	};

	void setup() {
	display.begin(SSD1306_SWITCHCAPVCC);
	//清楚OLED屏幕缓存
	display.clearDisplay();
	display.display();

	WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);

	Serial.begin(115200);
	Serial.println("ESP32 XIAOMI DISPLAY");

	initBluetooth();
	}

	void loop() {
	char printLog[256];
	Serial.printf("Start BLE scan for %d seconds...\n", SCAN_TIME);
	BLEScanResults foundDevices = pBLEScan->start(SCAN_TIME);
	int count = foundDevices.getCount();
	printf("Found device count : %d\n", count);
	delay(100);

	displayTemperature();
	}

	void initBluetooth()
	{
	BLEDevice::init("");
	pBLEScan = BLEDevice::getScan(); //create new scan
	pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
	pBLEScan->setActiveScan(true); //active scan uses more power, but get results faster
	pBLEScan->setInterval(0x50);
	pBLEScan->setWindow(0x30);
	}

	void displayTemperature() {
	if (current_temperature != previous_temperature) {
	previous_temperature = current_temperature;
	previous_humidity = current_humidity;
	display.clearDisplay();
	display.setTextSize(2);
	display.setTextColor(WHITE);
	display.setCursor(0, 0);
	display.print("Tem:");
	display.print(convertFloatToString(current_temperature));
	if (METRIC) {
	display.setCursor(115, 0);
	display.print("C");
	} else {
	display.setCursor(115, 0);
	display.print("F");
	}
	display.setTextSize(2);
	display.setTextColor(WHITE);
	display.setCursor(0, 40);
	display.print("Hum:");
	display.print(current_humidity, 1);
	display.print(" %");
	display.display();
	}
	}

	String convertFloatToString(float f)
	{
	String s = String(f, 1);
	return s;
	}

	//转换成华氏的自定义函数
	float CelciusToFahrenheit(float Celsius)
	{
	float Fahrenheit = 0;
	Fahrenheit = Celsius * 9 / 5 + 32;
	return Fahrenheit;
	}