moisture with relays

#include <SPI.h>
#include <MySensor.h>
#define MY_RADIO_NRF24

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
#define MY_DEBUG
#define CHILD_ID_BATTERY 0
#define SLEEP_TIME 600000 // Sleep time between reads (in milliseconds)
#define STABILIZATION_TIME 500 // Let the sensor stabilize 0.5 seconds before reading
#define BATTERY_FULL 3000 // 3,000 millivolts when battery is full (assuming 2xAA)
#define BATTERY_ZERO 1700 // 1,700 millivolts when battery is empty (reqires blown brownout detection fuse, use 2,800 otherwise)
// This sketch assumes power from 2xAA on Vcc (not RAW). Remove the power led and the voltage regulator for better battery life.
// Sensors shall be connected to GND and their analog pin. Throw away the middle chip, just use the pitchfork.
// Number of analog pins for each Arduino model can be seen at https://www.arduino.cc/en/Products/Compare
// A5 and A6 on most Arduinos cannot be used because they don't have internal pullups
const int SENSORS[] = {A0, A1, A2, A3, A4, A5}; // Remove the pins that you don't want to use
#define N_ELEMENTS(array) (sizeof(array)/sizeof((array)[0]))
long oldvoltage = 0;

#define RELAY_1  3  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 1 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay


MySensor gw;
MyMessage moisture_messages[N_ELEMENTS(SENSORS)];
MyMessage voltage_msg(CHILD_ID_BATTERY, V_VOLTAGE);

void before()
{
    for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
        // Then set relay pins in output mode
        pinMode(pin, OUTPUT);

    }
}


void setup()
{
  gw.begin();
  gw.sendSketchInfo("Plants moisture w bat", "1.2");
  gw.present(CHILD_ID_BATTERY, S_CUSTOM);
  gw.sendSketchInfo("Relay", "1.0");

  for (int sensor = 0; sensor < N_ELEMENTS(SENSORS); sensor++) {
    moisture_messages[sensor].sensor = sensor + 1; // Battery uses child ID 0 so sensors start at 1
    moisture_messages[sensor].type = V_HUM;
    delay(250);
    gw.present(sensor + 1, S_HUM);
  }
  for (int i = 0; i < N_ELEMENTS(SENSORS); i++) {
    pinMode(SENSORS[i], OUTPUT);
    digitalWrite(SENSORS[i], LOW);
  }

   for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {

    }
}

void receive(const MyMessage &message)
{
    // We only expect one type of message from controller. But we better check anyway.
    if (message.type==V_STATUS) {
        // Change relay state
        digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
        // Store state in eeprom
        saveState(message.sensor, message.getBool());
        // Write some debug info
        Serial.print("Incoming change for sensor:");
        Serial.print(message.sensor);
        Serial.print(", New status: ");
        Serial.println(message.getBool());
    }

void loop()
{
  for (int sensor = 0; sensor < N_ELEMENTS(SENSORS); sensor++) {
    pinMode(SENSORS[sensor], INPUT_PULLUP); // "Power on" the sensor and activate the internal pullup resistor
    analogRead(SENSORS[sensor]); // Read once to let the ADC capacitor start charging
    gw.sleep(STABILIZATION_TIME);
    int moistureLevel = (1023 - analogRead(SENSORS[sensor])) / 10.23;

    // Turn off the sensor to conserve battery and minimize corrosion
    pinMode(SENSORS[sensor], OUTPUT);
    digitalWrite(SENSORS[sensor], LOW);

    gw.send(moisture_messages[sensor].set(moistureLevel));
  }

  long voltage = readVcc();
  if (oldvoltage != voltage) { // Only send battery information if voltage has changed, to conserve battery.
    gw.send(voltage_msg.set(voltage / 1000.0, 3)); // redVcc returns millivolts and set wants volts and how many decimals (3 in our case)
    gw.sendBatteryLevel(round((voltage - BATTERY_ZERO) * 100.0 / (BATTERY_FULL - BATTERY_ZERO)));
    oldvoltage = voltage;
  }
  gw.sleep(SLEEP_TIME);
}

long readVcc()
{
  // From http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/
  // Read 1.1V reference against AVcc
  // set the reference to Vcc and the measurement to the internal 1.1V reference
#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
  ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
  ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
  ADMUX = _BV(MUX3) | _BV(MUX2);
#else
  ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#endif

  delay(2); // Wait for Vref to settle
  ADCSRA |= _BV(ADSC); // Start conversion
  while (bit_is_set(ADCSRA, ADSC)); // measuring

  uint8_t low  = ADCL; // must read ADCL first - it then locks ADCH
  uint8_t high = ADCH; // unlocks both

  long result = (high << 8) | low;

  result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
  return result; // Vcc in millivolts
}