Arduino sketch for homedata project

arduino.ino

#include <SparkFunBME280.h>
#include <Adafruit_HDC1000.h>

#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/wdt.h>

BME280 bme;
Adafruit_HDC1000 hdc = Adafruit_HDC1000();

volatile int seconds_asleep = 60;

ISR(WDT_vect)
{
  seconds_asleep++;
  if (seconds_asleep > 60)
  {
      Serial.println("Error: event was not handled!");
  }
}

void enterSleep(void)
{
  set_sleep_mode(SLEEP_MODE_PWR_SAVE);   /* EDIT: could also use SLEEP_MODE_PWR_DOWN for lowest power consumption. */
  sleep_enable();

  /* Now enter sleep mode. */
  sleep_mode();

  /* The program will continue from here after the WDT timeout*/
  sleep_disable(); /* First thing to do is disable sleep. */

  /* Re-enable the peripherals. */
  power_all_enable();
}

void setup(void) {
  initBME();

  if (!hdc.begin(0x43)) {
    Serial.println("Couldn't find sensor!");
    while (1);
  }

  /* Clear the reset flag. */
  MCUSR &= ~(1<<WDRF);

  /* In order to change WDE or the prescaler, we need to
   * set WDCE (This will allow updates for 4 clock cycles).
   */
  WDTCSR |= (1<<WDCE) | (1<<WDE);

  /* set new watchdog timeout prescaler value */
  WDTCSR = 1<<WDP2 | 1<<WDP1; /* 1.0 seconds */

  /* Enable the WD interrupt (note no reset). */
  WDTCSR |= _BV(WDIE);

}

void initBME(void) {
    //***Driver settings********************************//
  //commInterface can be I2C_MODE or SPI_MODE
  //specify chipSelectPin using arduino pin names
  //specify I2C address.  Can be 0x77(default) or 0x76

  //For I2C, enable the following and disable the SPI section
  bme.settings.commInterface = I2C_MODE;
  bme.settings.I2CAddress = 0x77;

  //For SPI enable the following and dissable the I2C section
  //bme.settings.commInterface = SPI_MODE;
  //bme.settings.chipSelectPin = 10;


  //***Operation settings*****************************//

  //renMode can be:
  //  0, Sleep mode
  //  1 or 2, Forced mode
  //  3, Normal mode
  bme.settings.runMode = 3; //Normal mode

  //tStandby can be:
  //  0, 0.5ms
  //  1, 62.5ms
  //  2, 125ms
  //  3, 250ms
  //  4, 500ms
  //  5, 1000ms
  //  6, 10ms
  //  7, 20ms
  bme.settings.tStandby = 0;

  //filter can be off or number of FIR coefficients to use:
  //  0, filter off
  //  1, coefficients = 2
  //  2, coefficients = 4
  //  3, coefficients = 8
  //  4, coefficients = 16
  bme.settings.filter = 0;

  //tempOverSample can be:
  //  0, skipped
  //  1 through 5, oversampling *1, *2, *4, *8, *16 respectively
  bme.settings.tempOverSample = 1;

  //pressOverSample can be:
  //  0, skipped
  //  1 through 5, oversampling *1, *2, *4, *8, *16 respectively
  bme.settings.pressOverSample = 1;

  //humidOverSample can be:
  //  0, skipped
  //  1 through 5, oversampling *1, *2, *4, *8, *16 respectively
  bme.settings.humidOverSample = 1;

  Serial.begin(57600);
  Serial.print("Program Started\n");
  Serial.print("Starting BME280... result of .begin(): 0x");

  //Calling .begin() causes the settings to be loaded
  delay(10);  //Make sure sensor had enough time to turn on. BME280 requires 2ms to start up.
  Serial.println(bme.begin(), HEX);
  Serial.println();
}

void loop() {
  if(seconds_asleep >= 60)
  {
    seconds_asleep = 0;
    measureData();
    delay(100);
  }
  enterSleep();
}

void measureData(void) {
  Serial.print("{ \"outside\" : {\"temperature\" :");
  Serial.print(bme.readTempC(), 6);
  Serial.print(", \"humidity\" : ");
  Serial.print(bme.readFloatHumidity(), 2);
  Serial.print(", \"pressure\" : ");
  Serial.print(bme.readFloatPressure() / 100, 2);
  Serial.print("}, \"inside\" : {\"temperature\" : ");
  Serial.print(hdc.readTemperature(), 6);
  Serial.print(", \"humidity\" : ");
  Serial.print(hdc.readHumidity(), 6);
  Serial.print("} }");
  Serial.println();
}