m5stickc-restful-weather.ino

#include <WiFi.h>
#include <WebServer.h>
#include <M5StickC.h>
#include "DHT12.h"
#include <Wire.h>
#include "Adafruit_Sensor.h"
#include <Adafruit_BMP280.h>
#include "bmm150.h"
#include "bmm150_defs.h"
DHT12 dht12; 
BMM150 bmm = BMM150();
bmm150_mag_data value_offset;
Adafruit_BMP280 bme;

float pressure = 0.0;
float headingDegrees = 0.0;
float tmp = 0.0;
float hum = 0.0;

/* Put your SSID & Password */
const char* ssid = "HackedNetwork";
const char* password =  "12345678";

WebServer server(80);

void calibrate(uint32_t timeout)
{
  int16_t value_x_min = 0;
  int16_t value_x_max = 0;
  int16_t value_y_min = 0;
  int16_t value_y_max = 0;
  int16_t value_z_min = 0;
  int16_t value_z_max = 0;
  uint32_t timeStart = 0;

  bmm.read_mag_data();  
  value_x_min = bmm.raw_mag_data.raw_datax;
  value_x_max = bmm.raw_mag_data.raw_datax;
  value_y_min = bmm.raw_mag_data.raw_datay;
  value_y_max = bmm.raw_mag_data.raw_datay;
  value_z_min = bmm.raw_mag_data.raw_dataz;
  value_z_max = bmm.raw_mag_data.raw_dataz;
  delay(100);

  timeStart = millis();
  
  while((millis() - timeStart) < timeout)
  {
    bmm.read_mag_data();
    
    /* Update x-Axis max/min value */
    if(value_x_min > bmm.raw_mag_data.raw_datax)
    {
      value_x_min = bmm.raw_mag_data.raw_datax;
      // Serial.print("Update value_x_min: ");
      // Serial.println(value_x_min);

    } 
    else if(value_x_max < bmm.raw_mag_data.raw_datax)
    {
      value_x_max = bmm.raw_mag_data.raw_datax;
      // Serial.print("update value_x_max: ");
      // Serial.println(value_x_max);
    }

    /* Update y-Axis max/min value */
    if(value_y_min > bmm.raw_mag_data.raw_datay)
    {
      value_y_min = bmm.raw_mag_data.raw_datay;
      // Serial.print("Update value_y_min: ");
      // Serial.println(value_y_min);

    } 
    else if(value_y_max < bmm.raw_mag_data.raw_datay)
    {
      value_y_max = bmm.raw_mag_data.raw_datay;
      // Serial.print("update value_y_max: ");
      // Serial.println(value_y_max);
    }

    /* Update z-Axis max/min value */
    if(value_z_min > bmm.raw_mag_data.raw_dataz)
    {
      value_z_min = bmm.raw_mag_data.raw_dataz;
      // Serial.print("Update value_z_min: ");
      // Serial.println(value_z_min);

    } 
    else if(value_z_max < bmm.raw_mag_data.raw_dataz)
    {
      value_z_max = bmm.raw_mag_data.raw_dataz;
      // Serial.print("update value_z_max: ");
      // Serial.println(value_z_max);
    }
    
    Serial.print(".");
    delay(1);

  }

  value_offset.x = value_x_min + (value_x_max - value_x_min)/2;
  value_offset.y = value_y_min + (value_y_max - value_y_min)/2;
  value_offset.z = value_z_min + (value_z_max - value_z_min)/2;
}
void setup() {
  Serial.begin(115200);

  // put your setup code here, to run once:
  M5.begin();
  Wire.begin(0,26);
  M5.Lcd.setRotation(3);
  M5.Lcd.fillScreen(BLACK);
  M5.Lcd.setCursor(0, 0, 2);
  M5.Lcd.printf("RESTful weather", headingDegrees);

  WiFi.begin(ssid, password);
  // Setting the hostname
  WiFi.setHostname("weather-stick");

  Serial.print("Start WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("Connecting ..");
  }

  M5.Lcd.setCursor(0, 20, 2);
  M5.Lcd.print("IP: ");
  M5.Lcd.println(WiFi.localIP());
  pinMode(M5_BUTTON_HOME, INPUT);

  if(bmm.initialize() == BMM150_E_ID_NOT_CONFORM) {
    Serial.println("Chip ID can not read!");
    while(1);
  } else {
    Serial.println("Initialize done!");
  }
  if (!bme.begin(0x76)){
      Serial.println("Could not find a valid BMP280 sensor, check wiring!");
      while (1);
  }

  calibrate(10);
  Serial.print("\n\rCalibrate done..");

  delay(100);
  
  server.on("/", handle_JsonResponse);
  server.onNotFound(handle_NotFound);

  server.begin();
  Serial.println("HTTP server started");

  Serial.print("Connected to the WiFi network. IP: ");
  Serial.println(WiFi.localIP());
}

void handle_JsonResponse(){
  String response;
  response += "{ \"weather\": { \"tempreture\": ";
  response += String(dht12.readTemperature(), 6);
  response += ", \"humidity\": ";
  response += String(dht12.readHumidity(), 6);
  response += ", \"pressure\": ";
  response += String(bme.readPressure(), 6);
  response += " } }";
  Serial.println(response);

  server.send(200, "application/json", response);
}

void handle_NotFound(){
  server.send(404, "text/plain", "Not found");
}

uint8_t setup_flag = 1;
void loop() {
  server.handleClient();

  // put your main code here, to run repeatedly:
  float tmp = dht12.readTemperature();
  float hum = dht12.readHumidity();
  M5.Lcd.setCursor(0, 40, 2);
  M5.Lcd.printf("Temp: %2.1f Humi: %2.0f%%", tmp, hum);

  float pressure = bme.readPressure();
  M5.Lcd.setCursor(0, 60, 2);
  M5.Lcd.printf("Pressure: %2.1f", pressure);
  Serial.print("Pressure: ");
  Serial.println(pressure);
  delay(100);

  if(!setup_flag){
    setup_flag = 1;
    calibrate(10);
    Serial.print("\n\rCalibrate done..");
  }

  if(digitalRead(M5_BUTTON_HOME) == LOW){
    setup_flag = 0;
    while(digitalRead(M5_BUTTON_HOME) == LOW);
  }

}