自宅IoT ESP8266 + 土壌水分センサー+ポンプの水やり機を作ってみた

#include <Wire.h>
#include <Adafruit_BMP280.h>
#include <ESP8266WiFi.h>
#include <time.h>

// for LM393
#define RAIN_PIN_A A0    // Raindrop sensor pin(Analog)
#define RAIN_PIN_D D7    // Raindrop sensor pin(Digital)
#define RAIN_PIN_V D3    // Raindrop power pin (for saving power)

// LED OK/NG by HTTP status
#define LED_OK D5        // D5 pin
#define LED_NG D6        // D6 pin

// Motor
#define MOTOR_PIN D4
#define WATERING_PERCENT 30
#define WATERING_DURATION 30

// Fan
#define FAN_PIN D8
#define COOLING_TEMP 30
#define COOLING_DURATION 30

// Constant values
#define JST     3600*9
#define DEF_VAL -255.0
#define BMP280_ADDRESS 0x76  // Check it beforehand

// Debug option for using Serial
#define DEBUG false
#define DEBUG_SERIAL if(DEBUG)Serial

// Valid options for cheking sensors
#define SENSOR_LM393_VALID true
#define SENSOR_BMP280_VALID true
#define MOTOR_VALID true
#define FAN_VALID true

Adafruit_BMP280 bmp; // I2C

// Const values for range of measurement
const int AirValue = 446;
const int WaterValue = 130;

// Wifi Credential
const char* ssid = "xxxxx";
const char* password = "xxxxx";

void setup() {

  // Initialization
  DEBUG_SERIAL.begin(9600);
  delay(100);
  DEBUG_SERIAL.println("Start");

  // Preprocessing
  Wire.begin();
  connect();
  delay(3000);  // Wait for a time is refreshed by NTP

  // BMP280
  if (SENSOR_BMP280_VALID) {
    if (!bmp.begin(BMP280_ADDRESS)) {
      DEBUG_SERIAL.println("Could not find BMP280...");
      //while (1) {}
    }
  }

  // LM393
  if (SENSOR_LM393_VALID) {
    pinMode(RAIN_PIN_D, INPUT);
    pinMode(RAIN_PIN_V, OUTPUT);
    digitalWrite(RAIN_PIN_V, LOW);
  }

  // Motor
  if (MOTOR_VALID) {
    pinMode(MOTOR_PIN, OUTPUT);
  }

  // Fan
  if (FAN_VALID) {
    pinMode(FAN_PIN, OUTPUT);
  }

  // LEDs setup
  pinMode(LED_OK, OUTPUT);
  pinMode(LED_NG, OUTPUT);

}

// Nothing to do
void loop() {

  // put your setup code here, to run once:
  // Main
  int elapsed_time = captureAndSendData();
  delay(60000); // 60s sleep

}

int captureAndSendData() {

  // put your main code here, to run repeatedly:

  time_t t, et;
  struct tm *tm;

  // time
  t = time(NULL);
  DEBUG_SERIAL.print("Epoch Time (Start): ");
  DEBUG_SERIAL.print(t);
  DEBUG_SERIAL.print(" \n");
  tm = localtime(&t);
  int it = t;

  // BMP280
  float temp = DEF_VAL;

  // LM393
  int soilMoisture = DEF_VAL;
  int soilMoistureValue = DEF_VAL;
  float soilMoisturePercent = DEF_VAL;

  // BMP280
  if (SENSOR_BMP280_VALID) {
    temp = bmp.readTemperature();
    DEBUG_SERIAL.print("Temp: ");
    DEBUG_SERIAL.print(temp);
    DEBUG_SERIAL.print(" °C");
    DEBUG_SERIAL.print(" \n");

    delay(100);
  }

  // LM393
  if (SENSOR_LM393_VALID) {
    digitalWrite(RAIN_PIN_V, HIGH);
    delay(100);

    soilMoisture = digitalRead(RAIN_PIN_D);
    soilMoistureValue = analogRead(RAIN_PIN_A);
    soilMoisturePercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);

    digitalWrite(RAIN_PIN_V, LOW);
    DEBUG_SERIAL.print("Moisture: ");
    DEBUG_SERIAL.print(soilMoisturePercent);
    DEBUG_SERIAL.print(" % ");
    DEBUG_SERIAL.print("(");
    DEBUG_SERIAL.print(soilMoistureValue);
    DEBUG_SERIAL.print(")");
    DEBUG_SERIAL.print(" \n");

    delay(100);
  }

  // Motor
  if (MOTOR_VALID) {
    if (soilMoisturePercent < WATERING_PERCENT) {
      DEBUG_SERIAL.println("Motor started. Watering is started.");
      digitalWrite(MOTOR_PIN, HIGH);
      delay(WATERING_DURATION*1000);
    }
    digitalWrite(MOTOR_PIN, LOW);
    DEBUG_SERIAL.println("Motor stopped.");
  }

  // Fan
  if (FAN_VALID) {
    if (COOLING_TEMP < temp) {
      DEBUG_SERIAL.println("Fan started. Cooling is started.");
      digitalWrite(FAN_PIN, HIGH);
      delay(COOLING_DURATION*1000);
    }
    digitalWrite(FAN_PIN, LOW);
    DEBUG_SERIAL.println("Fan stopped.");
  }

  // end time
  et = time(NULL);
  DEBUG_SERIAL.print("Epoch Time (End): ");
  DEBUG_SERIAL.print(et);
  DEBUG_SERIAL.print(" \n");
  tm = localtime(&et);
  int iet = et;

  int elapsed_time = iet - it;
  DEBUG_SERIAL.print("Elapsed Time: ");
  DEBUG_SERIAL.print(elapsed_time);
  DEBUG_SERIAL.print(" \n");

  return elapsed_time;
}

// WiFi Setup
void connect () {

  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) {
    DEBUG_SERIAL.print('.');
    delay(500);
  }
  DEBUG_SERIAL.println();
  DEBUG_SERIAL.printf("Connected, IP address: ");
  DEBUG_SERIAL.println(WiFi.localIP());
  configTime( JST, 0, "ntp.nict.jp", "ntp.jst.mfeed.ad.jp");

}

#define RAIN_PIN_A A0
#define DEF_VAL -255.0

const int AirValue = 446;
const int WaterValue = 130;

int soilMoistureValue = DEF_VAL;
float soilMoisturePercent = DEF_VAL;

soilMoistureValue = analogRead(RAIN_PIN_A);
soilMoisturePercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);