DIY “Intelligent” Offline Power Strip

Published by Rui Gaspar on

In this video I will show you in great detail, how to transform a traditional power strip to a “intelligent” power strip.

Components:

Diagram

Board Scheme:

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3D Printer – Case

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TopBoxDownload
BottomBoxDownload

3D Printer – Power strip supports

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SupportDownload

Source Code

#include <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD
#include <TimerOne.h>

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

int PIN_BTN_SELECT = 4;
int PIN_BTN_REMOVE = 3;
int PIN_BTN_ADD = 2;

int PIN_LED_1 = 5;
int PIN_LED_2 = 6;
int PIN_LED_3 = 7;
int PIN_LED_4 = 8;

int PIN_RELAY_1 = 9;
int PIN_RELAY_2 = 10;
int PIN_RELAY_3 = 11;
int PIN_RELAY_4 = 12;

int BLINK_BTN_TIMER = 10;
int BLINK_LED_PIN = -1;

int CURRENT_CONFIG_SOCKET = 0;
int CURRENT_CONFIG_TIME = 1;

int LAST_BTN_SELECT_STATUS = 0;
int LAST_BTN_ADD_STATUS = 0;
int LAST_BTN_REMOVE_STATUS = 0;

int BACKLIGHT_TIMEOUT = 0;

long RELAY_1_TIMEOUT = 0;
long RELAY_2_TIMEOUT = 0;
long RELAY_3_TIMEOUT = 0;
long RELAY_4_TIMEOUT = 0;

void setup() {

  pinMode(PIN_BTN_SELECT, INPUT);
  pinMode(PIN_BTN_ADD, INPUT);
  pinMode(PIN_BTN_REMOVE, INPUT);

  pinMode(PIN_LED_1, OUTPUT);
  pinMode(PIN_LED_2, OUTPUT);
  pinMode(PIN_LED_3, OUTPUT);
  pinMode(PIN_LED_4, OUTPUT);

  pinMode(PIN_RELAY_1, OUTPUT);
  pinMode(PIN_RELAY_2, OUTPUT);
  pinMode(PIN_RELAY_3, OUTPUT);
  pinMode(PIN_RELAY_4, OUTPUT);

  digitalWrite(PIN_RELAY_1, HIGH);
  digitalWrite(PIN_RELAY_2, HIGH);
  digitalWrite(PIN_RELAY_3, HIGH);
  digitalWrite(PIN_RELAY_4, HIGH);

  Serial.begin(9600);
  
  lcd.init();

  Timer1.initialize(1000000); // 1000000 -> 1 secod (10000 test)
  Timer1.attachInterrupt( relaysTimeout ); // attach the service routine here
}

void loop() {

  processButtons();
  blinkTimer();
  backlightTimeout();
  //debug();

  delay(20);
}

void relaysTimeout() {

  if (CURRENT_CONFIG_SOCKET == 0)
  {
    RELAY_1_TIMEOUT--;
    if (RELAY_1_TIMEOUT < 0) {
      RELAY_1_TIMEOUT = 0;
    }

    RELAY_2_TIMEOUT--;
    if (RELAY_2_TIMEOUT < 0) {
      RELAY_2_TIMEOUT = 0;
    }

    RELAY_3_TIMEOUT--;
    if (RELAY_3_TIMEOUT < 0) {
      RELAY_3_TIMEOUT = 0;
    }

    RELAY_4_TIMEOUT--;
    if (RELAY_4_TIMEOUT < 0) {
      RELAY_4_TIMEOUT = 0;
    }

    digitalWrite(PIN_LED_1, RELAY_1_TIMEOUT > 0 ? HIGH : LOW);
    digitalWrite(PIN_RELAY_1, RELAY_1_TIMEOUT > 0 ? LOW : HIGH);

    digitalWrite(PIN_LED_2, RELAY_2_TIMEOUT > 0 ? HIGH : LOW);
    digitalWrite(PIN_RELAY_2, RELAY_2_TIMEOUT > 0 ? LOW : HIGH);

    digitalWrite(PIN_LED_3, RELAY_3_TIMEOUT > 0 ? HIGH : LOW);
    digitalWrite(PIN_RELAY_3, RELAY_3_TIMEOUT > 0 ? LOW : HIGH);

    digitalWrite(PIN_LED_4, RELAY_4_TIMEOUT > 0 ? HIGH : LOW);
    digitalWrite(PIN_RELAY_4, RELAY_4_TIMEOUT > 0 ? LOW : HIGH);

  }
}

void debug() {

  Serial.print(LAST_BTN_SELECT_STATUS);
  Serial.print(", ");
  Serial.print(LAST_BTN_ADD_STATUS);
  Serial.print(", ");
  Serial.print(LAST_BTN_REMOVE_STATUS);

  Serial.print(" - (");
  Serial.print(CURRENT_CONFIG_SOCKET);
  Serial.print("|");
  Serial.print(CURRENT_CONFIG_TIME);
  Serial.println(")");
}

void backlightTimeout() {

  bool active = digitalRead(PIN_BTN_SELECT) == HIGH ||
                digitalRead(PIN_BTN_ADD) == HIGH ||
                digitalRead(PIN_BTN_REMOVE) == HIGH;


  if (active) {
    BACKLIGHT_TIMEOUT = 100;
  }


  BACKLIGHT_TIMEOUT--;

  if (BACKLIGHT_TIMEOUT < 0) {
    BACKLIGHT_TIMEOUT = 0;
    lcd.noBacklight();
    lcd.noDisplay();
    lcd.clear();
    lcd.print("- PRESS SELECT -");

    setRelayTimeoutConfig();
    CURRENT_CONFIG_SOCKET = 0;
    BLINK_LED_PIN = -1;
  }
  else {
    lcd.backlight();
    lcd.display();
  }
}


void blinkTimer() {

  if (BLINK_LED_PIN == -1) {
    return;
  }

  BLINK_BTN_TIMER--;

  if (BLINK_BTN_TIMER < -10) {
    BLINK_BTN_TIMER = 10;
  }

  if (BLINK_BTN_TIMER > 0) {
    digitalWrite(BLINK_LED_PIN, HIGH);
  }
  else {
    digitalWrite(BLINK_LED_PIN, LOW);
  }

}

void blinkLed(int pin) {

  digitalWrite(BLINK_LED_PIN, HIGH);
  BLINK_LED_PIN = pin;
  BLINK_BTN_TIMER = 10;
}


void processButtons() {

  int btnSelectStatus = digitalRead(PIN_BTN_SELECT);
  int btnAddStatus = digitalRead(PIN_BTN_ADD);
  int btnRemoveStatus = digitalRead(PIN_BTN_REMOVE);

  if (btnSelectStatus == HIGH && LAST_BTN_SELECT_STATUS == LOW) {

    setRelayTimeoutConfig(); // Store last config

    CURRENT_CONFIG_SOCKET++;

    if (CURRENT_CONFIG_SOCKET > 3 /*4*/) {
      CURRENT_CONFIG_SOCKET = 1;
    }

    if (CURRENT_CONFIG_SOCKET == 1) {
      blinkLed(PIN_LED_1);
      digitalWrite(PIN_LED_2, LOW);
      digitalWrite(PIN_LED_3, LOW);
      digitalWrite(PIN_LED_4, LOW);
    }

    if (CURRENT_CONFIG_SOCKET == 2) {
      blinkLed(PIN_LED_2);
      digitalWrite(PIN_LED_1, LOW);
      digitalWrite(PIN_LED_3, LOW);
      digitalWrite(PIN_LED_4, LOW);
    }

    if (CURRENT_CONFIG_SOCKET == 3) {
      blinkLed(PIN_LED_3);
      digitalWrite(PIN_LED_1, LOW);
      digitalWrite(PIN_LED_2, LOW);
      digitalWrite(PIN_LED_4, LOW);
    }
    
    if (CURRENT_CONFIG_SOCKET == 4) {
      blinkLed(PIN_LED_4);
      digitalWrite(PIN_LED_1, LOW);
      digitalWrite(PIN_LED_2, LOW);
      digitalWrite(PIN_LED_3, LOW);

      CURRENT_CONFIG_SOCKET = 1;
    }

    CURRENT_CONFIG_TIME = 1;

    displayConfig();
  }

  if (btnAddStatus == HIGH && LAST_BTN_ADD_STATUS == LOW && CURRENT_CONFIG_SOCKET > 0) {

    CURRENT_CONFIG_TIME++;

    if (CURRENT_CONFIG_TIME > 8) {
      CURRENT_CONFIG_TIME = 8;
    }

    displayConfig();
  }

  if (btnRemoveStatus == HIGH && LAST_BTN_REMOVE_STATUS == LOW && CURRENT_CONFIG_SOCKET > 0) {
    CURRENT_CONFIG_TIME--;

    if (CURRENT_CONFIG_TIME < 0) {
      CURRENT_CONFIG_TIME = 0;
    }

    displayConfig();
  }

  LAST_BTN_SELECT_STATUS = btnSelectStatus;
  LAST_BTN_REMOVE_STATUS = btnRemoveStatus;
  LAST_BTN_ADD_STATUS = btnAddStatus;
}


void setRelayTimeoutConfig() {

  if (CURRENT_CONFIG_SOCKET == 1) {
    if (CURRENT_CONFIG_TIME == 0) {
      RELAY_1_TIMEOUT = 0;
    }
    else if (CURRENT_CONFIG_TIME == 2) {
      RELAY_1_TIMEOUT = 30 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 3) {
      RELAY_1_TIMEOUT = 60 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 4) {
      RELAY_1_TIMEOUT = 120 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 5) {
      RELAY_1_TIMEOUT = 240 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 6) {
      RELAY_1_TIMEOUT = 480 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 7) {
      RELAY_1_TIMEOUT = 1440 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 8) {
      RELAY_1_TIMEOUT = 2880 * 60UL;
    }
  }

  if (CURRENT_CONFIG_SOCKET == 2) {
    if (CURRENT_CONFIG_TIME == 0) {
      RELAY_2_TIMEOUT = 0;
    }
    else if (CURRENT_CONFIG_TIME == 2) {
      RELAY_2_TIMEOUT = 30 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 3) {
      RELAY_2_TIMEOUT = 60 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 4) {
      RELAY_2_TIMEOUT = 120 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 5) {
      RELAY_2_TIMEOUT = 240 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 6) {
      RELAY_2_TIMEOUT = 480 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 7) {
      RELAY_2_TIMEOUT = 1440 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 8) {
      RELAY_2_TIMEOUT = 2880 * 60UL;
    }
  }


  if (CURRENT_CONFIG_SOCKET == 3) {
    if (CURRENT_CONFIG_TIME == 0) {
      RELAY_3_TIMEOUT = 0;
    }
    else if (CURRENT_CONFIG_TIME == 2) {
      RELAY_3_TIMEOUT = 30 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 3) {
      RELAY_3_TIMEOUT = 60 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 4) {
      RELAY_3_TIMEOUT = 120 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 5) {
      RELAY_3_TIMEOUT = 240 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 6) {
      RELAY_3_TIMEOUT = 480 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 7) {
      RELAY_3_TIMEOUT = 1440 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 8) {
      RELAY_3_TIMEOUT = 2880 * 60UL;
    }
  }

  if (CURRENT_CONFIG_SOCKET == 4) {
    if (CURRENT_CONFIG_TIME == 0) {
      RELAY_4_TIMEOUT = 0;
    }
    else if (CURRENT_CONFIG_TIME == 2) {
      RELAY_4_TIMEOUT = 30 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 3) {
      RELAY_4_TIMEOUT = 60 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 4) {
      RELAY_4_TIMEOUT = 120 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 5) {
      RELAY_4_TIMEOUT = 240 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 6) {
      RELAY_4_TIMEOUT = 480 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 7) {
      RELAY_4_TIMEOUT = 1440 * 60UL;
    }
    else if (CURRENT_CONFIG_TIME == 8) {
      RELAY_4_TIMEOUT = 2880 * 60UL;
    }
  }

}

void displayConfig() {

  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("     CONFIG");

  lcd.setCursor(0, 1);
  lcd.print("#");


  if (CURRENT_CONFIG_SOCKET == 1) {
    lcd.print("1");
  }
  else if (CURRENT_CONFIG_SOCKET == 2) {
    lcd.print("2");
  }
  else if (CURRENT_CONFIG_SOCKET == 3) {
    lcd.print("3");
  }
  else if (CURRENT_CONFIG_SOCKET == 4) {
    lcd.print("4");
  }

  lcd.print(": ");

  if (CURRENT_CONFIG_TIME == 0) {
    lcd.print("Disable");
  }
  else if (CURRENT_CONFIG_TIME == 1) {

    if (CURRENT_CONFIG_SOCKET == 1 && RELAY_1_TIMEOUT > 0) {
      lcd.print("(");
      lcd.print(RELAY_1_TIMEOUT / 60);
      lcd.print(" min)");
    }
    else if (CURRENT_CONFIG_SOCKET == 2 && RELAY_2_TIMEOUT > 0) {
      lcd.print("(");
      lcd.print(RELAY_2_TIMEOUT / 60);
      lcd.print(" min)");
    }
    else if (CURRENT_CONFIG_SOCKET == 3 && RELAY_3_TIMEOUT > 0) {
      lcd.print("(");
      lcd.print(RELAY_3_TIMEOUT / 60);
      lcd.print(" min)");
    }
    else if (CURRENT_CONFIG_SOCKET == 4 && RELAY_4_TIMEOUT > 0) {
      lcd.print("(");
      lcd.print(RELAY_4_TIMEOUT / 60);
      lcd.print(" min)");
    }
    else {
      lcd.print("-------");
    }
  }
  else if (CURRENT_CONFIG_TIME == 2) {
    lcd.print("30 min");
  }
  else if (CURRENT_CONFIG_TIME == 3) {
    lcd.print("1 hour");
  }
  else if (CURRENT_CONFIG_TIME == 4) {
    lcd.print("2 hours");
  }
  else if (CURRENT_CONFIG_TIME == 5) {
    lcd.print("4 hours");
  }
  else if (CURRENT_CONFIG_TIME == 6) {
    lcd.print("8 hours");
  }
  else if (CURRENT_CONFIG_TIME == 7) {
    lcd.print("1 day");
  }
  else if (CURRENT_CONFIG_TIME == 8) {
    lcd.print("2 days");
  }

  // Disable        ->
  // 30 min         -> 30
  // 1 hour         -> 60
  // 2 hour         -> 120
  // 4 hour         -> 240
  // 8 hour         -> 480
  // 1 day          -> 1440
  // 2 days         -> 2880
}

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