#define LOW_POWER_SLEEP // dependency: Adafruit SleepyDog

#define SLOW_START_DELAY 5000 // ms
#define PIN_SPEAKER 12

#define RELAYS 8
int relayPins[] = {
  2, 3, 4, 5, 6, 7, 8, 9
};

#ifdef LOW_POWER_SLEEP
#include <Adafruit_SleepyDog.h>
#endif

void beep(int freq, int ms) {
  tone(PIN_SPEAKER, freq, ms);
  delay(ms);
}

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH);
  for (int i = 0; i < RELAYS; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW);
  }
  
  Serial.begin(115200);
  while (!Serial)
    delay(10);

  Serial.println();
  Serial.println(" [ Slow-start Power Socket ] ");

  beep(440, 200);
  delay(1000);

  for (int i = 0; i < RELAYS; i++) {
    Serial.println("...");
    delay(SLOW_START_DELAY/2);
    beep(100, 10);
    delay(SLOW_START_DELAY/2);
    
    Serial.print("Starting ");
    Serial.print(i+1);
    Serial.print(" ... ");

    beep(200, 50);
    digitalWrite(relayPins[i], HIGH);
    
    Serial.println("Done.");
    beep(460, 100);
  }

  Serial.println();
  Serial.println("Finished!");
  delay(1000);
  beep(210, 100);
  beep(420, 100);
  beep(560, 500);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);
}

void loop() {
  // nothing to do!
#ifdef LOW_POWER_SLEEP
  Watchdog.sleep();
#else
  delay(1000);
#endif
}