作りながら学ぶArduino+=電子工作入門

// This is a library for the BME280 humidity, temperature & pressure sensor
//  Designed specifically to work with the Adafruit BME280 Breakout
//  ----> http://www.adafruit.com/products/2650
//  Written by Limor Fried & Kevin Townsend for Adafruit Industries.

#include <ArduinoBLE.h>

#define BME280_SERVICE_UUID   "F000AA30-0452-4000-B000-000000000000"  // BLE Service
BLEService Sensor_BME280_Service(BME280_SERVICE_UUID);

#define BME280_Temp_Characteristic_UUID    "F000AA31-0452-4000-B000-000000000000"  // BLE  Characteristic
#define BME280_Press_Characteristic_UUID   "F000AA32-0452-4000-B000-000000000000"
#define BME280_Humidity_Characteristic_UUID   "F000AA33-0452-4000-B000-000000000000"
BLEIntCharacteristic  BME280_Temp(BME280_Temp_Characteristic_UUID, BLERead | BLENotify);
BLEIntCharacteristic  BME280_Press(BME280_Press_Characteristic_UUID, BLERead | BLENotify);
BLEIntCharacteristic  BME280_Humidity(BME280_Humidity_Characteristic_UUID, BLERead | BLENotify);

#define BME280_Temp_Descriptor_UUID    "2901"  // BLE  Descriptor
#define BME280_Press_Descriptor_UUID   "2901"
#define BME280_Humidity_Descriptor_UUID   "2901"
BLEDescriptor   BME280_Temp_Descriptor(BME280_Temp_Descriptor_UUID, "Temperature: `C int format");
BLEDescriptor   BME280_Press_Descriptor(BME280_Press_Descriptor_UUID, "Pressure: hPa");
BLEDescriptor   BME280_Humidity_Descriptor(BME280_Humidity_Descriptor_UUID, "Humidity: %");

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <Adafruit_SSD1306.h>
float tempC;
float pressure;
float humidity;

Adafruit_BME280 bme; // I2C
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

#define localNAME  "BME280_int"
int oldValue = 0;  // last value 

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10); 
  Serial.println(F("BME280  + ssd1306 + BLE"));
  
  // begin initialization
  if (!BLE.begin()) {
    Serial.println("starting BLE failed!");
    while (1);
  }

    unsigned status;
    
    // default settings
    status = bme.begin();  
    // You can also pass in a Wire library object like &Wire2
    // status = bme.begin(0x76, &Wire2)
    if (!status) {
        Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
        Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
        Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
        Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
        Serial.print("        ID of 0x60 represents a BME 280.\n");
        Serial.print("        ID of 0x61 represents a BME 680.\n");
        while (1) delay(10);
    }
    Serial.println();

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for (;;)
      ; // Don't proceed, loop forever
  }
  display.display();
  delay(500); // Pause for 2 seconds
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setRotation(0);
  display.clearDisplay();

  BLE.setLocalName(localNAME);
  BLE.setAdvertisedService(Sensor_BME280_Service);  // add the service UUID
  Sensor_BME280_Service.addCharacteristic(BME280_Temp);  // add characteristic
  Sensor_BME280_Service.addCharacteristic(BME280_Press);
  Sensor_BME280_Service.addCharacteristic(BME280_Humidity);
  BME280_Temp.addDescriptor(BME280_Temp_Descriptor);  // add descriptor
  BME280_Press.addDescriptor(BME280_Press_Descriptor);
  BME280_Humidity.addDescriptor(BME280_Humidity_Descriptor);
  BLE.addService(Sensor_BME280_Service);  // Add service
  BME280_Temp.writeValue(oldValue);  // set initial value for this characteristic
  BME280_Press.writeValue(oldValue);
  BME280_Humidity.writeValue(oldValue);
  BLE.advertise();  // start advertising
  Serial.println("Bluetooth device active, waiting for connections...");
}

void loop() { 
  // wait for a BLE central
  BLEDevice central = BLE.central();
 
  // if a central is connected to the peripheral:
  if (central) {
    delay(100);
    Serial.print("Connected to central: ");
    // print the central's BT address:
    Serial.println(central.address());
 
    while (central.connected()) {
      updateValue();
      delay(1000);
    }
    // when the central disconnects
    Serial.print("Disconnected from central: ");
    Serial.println(central.address());
  }
}

void updateValue() {
  display.clearDisplay();
  display.setCursor(0, 0);

  tempC = bme.readTemperature();
  pressure = bme.readPressure() / 100.0;
  humidity = bme.readHumidity();

    Serial.print("Temperature = ");
    Serial.print(tempC);
    Serial.println(" °C");

    Serial.print("Pressure = ");
    Serial.print( pressure);
    Serial.println(" hPa");

    Serial.print("Humidity = ");
    Serial.print(humidity);
    Serial.println(" %");

    Serial.println();

  display.println("Temperature: - `C");
  display.print(tempC, 2);
  display.println("");
  display.println("");
  display.println("Pressure: - hPa");
  display.print(pressure, 1);
  display.println("");
  display.println("");
  display.println("Humidity: - %");
  display.print(humidity, 1);
  display.display();

  // if value has changed
  if (tempC != oldValue) {
    // update  characteristic
    BME280_Temp.writeValue((int)(tempC*100.0));
    BME280_Press.writeValue((int)(pressure*10.0));
    BME280_Humidity.writeValue((int)(humidity*10.0));
    oldValue = tempC; // save the level for next comparison
  }
}