Controlling Halloween decorations with an Arduino Uno, an Ethernet Shield, and a Relay Shield.

We had a few Halloween decorations with push button switches that we networked via an Arduino Uno. Three of the relays from the relay shield were used to activate a Grim Reaper and two sets of skulls. The push button from each decoration was cut and discarded. One of the wires coming from a decoration was connected to the common and the other to the normally open contact of a relay.

An Arduino Uno, an Ethernet Shield, and a Relay Shield

An Arduino Uno, an Ethernet Shield, and a Relay Shield

The Arduino sketch delivers a web based interface and parses incoming requests to evaluate which relay should be activated. The sketch is provided below.

Chrome Browser

Chrome Browser

#include <SPI.h>
#include <EthernetV2_0.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 125);
EthernetServer server(80);

#define W5200_CS  10
#define SDCARD_CS 4

void setup() {
  Serial.begin(9600);

  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  delay(500);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  pinMode(SDCARD_CS, OUTPUT);
  digitalWrite(SDCARD_CS, HIGH);

  Ethernet.begin(mac, ip);
  server.begin();
}


void loop() {
  EthernetClient client = server.available();
  if (client) {
    boolean currentLineIsBlank = true;
    String req = "";

    while (client.available()) {
      char c = client.read();
      req += c;
      if (c == '\n')
        break;
    }

    if (client.connected()) {
      client.println("HTTP/1.1 200 OK");
      client.println("Content-Type: text/html");
      client.println("Connnection: close");
      client.println();
      client.println("<!DOCTYPE HTML>");
      client.println("<html><head><meta name='viewport' content='width=device-width, initial-scale=1'><title>arduino</title><script src='https://code.jquery.com/jquery-2.1.4.min.js'></script></head><body><div id='container'>");
      client.println("<style>");
      client.println("#container { width:256px; }");
      client.println(".button:hover { box-shadow:0 0 8px 0 rgba(0,0,0,0.5) inset; }");
      client.println(".button { font-family:Arial; font-weight:bold; padding:8px 16px; margin:4px; border-radius:4px; border:1px solid #bbb; cursor:pointer; color:#fff; background: #579; }");
      client.println("</style>");
      client.println("<script>function send(val) { jQuery.get('/index.php', { pin:val}); }</script>");
      client.println("<div class='button' onmousedown='stop(event);' onclick='stop(event);send(\"all\");'>All Decorations</div>");
      client.println("<div class='button' onmousedown='stop(event);' onclick='stop(event);send(\"5\");'>Grim Reaper</div>");
      client.println("<div class='button' onmousedown='stop(event);' onclick='stop(event);send(\"67\");'>Skulls</div>");
//      client.println("<div class='button' onmousedown='stop(event);' onclick='stop(event);send(\"7\");'>Skulls 2</div>");
      client.println("</div></body></html>");
    }
    delay(1);
    client.stop();

    if (req.indexOf("pin=all") > -1) {
      digitalWrite(5, HIGH);
      digitalWrite(6, HIGH);
      digitalWrite(7, HIGH);
      delay(50);
      digitalWrite(5, LOW);
      digitalWrite(6, LOW);
      digitalWrite(7, LOW);
    } else if (req.indexOf("pin=5") > -1) {
      digitalWrite(5, HIGH);
      delay(50);
      digitalWrite(5, LOW);
    } else if (req.indexOf("pin=67") > -1) {
      digitalWrite(6, HIGH);
      digitalWrite(7, HIGH);
      delay(50);
      digitalWrite(6, LOW);
      digitalWrite(7, LOW);
    //} else if (req.indexOf("pin=7") > -1) {
    //  digitalWrite(7, HIGH);
  //    delay(50);
//      digitalWrite(7, LOW);
    }

  }
}

Leave a Reply

Your email address will not be published. Required fields are marked *