Smart Home Event Viewer

I would like to be aware of different states in my smart home. And not only me, but also my girlfriend. And in such a way that you can see it when you walk past - intentionally NOT via your smartphone

• For the event viewer itself
• Wemos D1 microcontroller
• Powersupply
• circuit board to solder yourself
• optional various screw terminals
• 4 resistors 220 Ohm
• 1 resistor 1 kOhm
• 4 LEDs
• 1 Button (I chose a button that matches our light switches)
• 1 OLED Display (I have a 0.96" OLED SSD1306 I2C display - 128x64 pixels)
• a nice housing for the electronics

• For my own SmartHome infrastructure
• Raspberry PI with following running
• Apache
• PHP
• MySQL
• etc..
• Garage-Gate Controller (See Instruction "Garage Door Opener Calling by Phone Via Arduino and ASTERISK Behind a FritzBox")
• Washing machine and dryer monitor (Instructions come later)

I can controll the box by following http-commands:

• http://10.45.0.23/LED=ON   Blue LED ON
• http://10.45.0.23/LED=OFF   Blue LED OFF
• http://10.45.0.23/LED=TRON   Red LED ON
• http://10.45.0.23/LED=TROFF   Red LED OFF
• http://10.45.0.23/LED=GAON   Yello LED ON
• http://10.45.0.23/LED=GAOFF   Yello LED OFF
• http://10.45.0.23/TX?<SOME TEXT> --> the text SOME TEXT is shown on the display

• So i use the blue led to indicate that the electric car is fully charged
• The red LED lets me know when the washer or dryer is done, because washing machine and dryer are 1 floor below
• The yellow LED is on when the garage is open and off when the garage is closed
• The green LED always lights up when a text has been sent to the display. I use the text function to indicate when I have to take out which garbage can

If the light switch (button) on the housing is pressed, ALL messages / LEDs go out

Since the Event Viewer is controlled via http calls (I do this via "wget" from the Raspberry), any software or process can control it.

1. Soldering the Board
2. i choosed plug headers to easy remove and touch the Wemos D1 board
3. i choosed screw terminals to connect the LEDs and the button
4. I subsequently soldered the display directly to the soldering board
5. Build the case and store everything inside. I used 2 different Lego kits to house the LEDs

#include <ESP8266WiFi.h>
#include "Wire.h";
#include "SSD1306.h";

const char* ssid = "<My WLAN Name>";
const char* password = "<My WLAN Password>";

//
// the pins used for connected button and LEDs 
//
int ledPin = D8;
int taster = D2;
int ledPinTR = D3;
int ledPinGA = D4;
int ledPinDP = D7;

int data;
int tasterstatus = 0;

String dataset = "";
String arg1;
String arg2;
String arg3;

WiFiServer server(80);

//
// the pins used for conncting the OLED display
//
SSD1306 display(0x3C, D6, D5);

void setup() {
Serial.begin(115200);
delay(10);

pinMode(ledPin, OUTPUT);
pinMode(ledPinTR, OUTPUT);
pinMode(ledPinGA, OUTPUT);
pinMode(ledPinDP, OUTPUT);
pinMode(taster, INPUT);
digitalWrite(ledPin, LOW);

//
// Important: The Wemos needs a STATIC IP 
//
IPAddress ip(10, 45, 0, 23);
IPAddress dns(10, 45, 0, 1);
IPAddress gateway(10, 45, 0, 1);
IPAddress subnet(255, 255, 0, 0);
WiFi.config(ip, dns, gateway, subnet);

Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
 delay(500);
 Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");

server.begin();

Serial.println("Server started");
Serial.print("Use this URL : ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}

void loop() {
tasterstatus = digitalRead(taster);

//
// Rest the EventViewer (switching out the LEDs and clearing the display)
//
if (tasterstatus == HIGH) {
 digitalWrite(ledPin, LOW);
 digitalWrite(ledPinTR, LOW);
 digitalWrite(ledPinGA, LOW);
 digitalWrite(ledPinDP, LOW);
 display.init();
 display.setFont(ArialMT_Plain_24);
 display.drawString(0, 0, "");
 display.display();
}

WiFiClient client = server.available();
if (!client) {
 return;
}

Serial.println("new client");
while(!client.available()){
 delay(1);
}

String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();

//
// The Adress contains "/TX" --> receiving Text-message and write it to the display
// 
if (request.indexOf("/TX") != -1) {
 digitalWrite(ledPinDP, HIGH);
 Serial.println("Freitext");
 Serial.print("request: ");
 Serial.println(request);

 arg1 = split(request, '?', 1);
 arg2 = split(request, '?', 2);
 arg3 = split(request, '?', 3);
 dataset = "";
 Serial.print("arg1: ");
 Serial.println(arg1);
 Serial.print("arg2: ");
 Serial.println(arg2);
 Serial.print("arg3: ");
 Serial.println(arg3);
 display.init();
 display.setFont(ArialMT_Plain_24);
 display.drawString(0, 0, arg1);
 display.display();
} 

//
// Switch the addressed LED on or off
//
if (request.indexOf("/LED=ON") != -1) {
 digitalWrite(ledPin, HIGH);
} 
if (request.indexOf("/LED=OFF") != -1){
 digitalWrite(ledPin, LOW);
}

if (request.indexOf("/LED=TRON") != -1) {
 digitalWrite(ledPinTR, HIGH);
} 
if (request.indexOf("/LED=TROFF") != -1){
 digitalWrite(ledPinTR, LOW);
}
if (request.indexOf("/LED=GAON") != -1) {
 digitalWrite(ledPinGA, HIGH);
} 
if (request.indexOf("/LED=GAOFF") != -1){
 digitalWrite(ledPinGA, LOW);
}

// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("Led pin is now: ");
client.println("<br><br>");
client.println("Click <a href=\"/LED=ON\">here</a> turn the LED on pin 5 ON<br>");
client.println("Click <a href=\"/LED=OFF\">here</a> turn the LED on pin 5 OFF<br>");
client.println("</html>");
delay(1);
Serial.println("Client disconnected");
Serial.println("");
}

String split(String s, char parser, int index) {
 String rs = "";
 int parserIndex = index;
 int parserCnt = 0;
 int rFromIndex = 0, rToIndex = -1;
 while (index >= parserCnt) {
   rFromIndex = rToIndex + 1;
   rToIndex = s.indexOf(parser, rFromIndex);
   if (index == parserCnt) {
   return s.substring(rFromIndex, rToIndex);
 }
   else parserCnt++;
 }
 return rs;
}

I simply use the CRONTAB for appointments as to when which garbage can has to be taken out. With this I control the "dsp_tonne.php".

Here the dsp_tonne.php:

<?php
// Send the passed text to the event viewer
system("wget --no-cache --spider http://10.45.0.23/TX?" . $argv[1] . "???");

// Also send an email
$abs = "lebon1089@gmail.com";
$bet = $argv[1] . " muss raus";
$txt = $argv[1] . " muss raus";
$emp = "lebon1089@gmail.com";
mail($emp, $bet, $txt, "From: gelbesHaus <$abs>");
?>

The other wget calls I use for the other LEDs come from the subprograms of my other smart home components.

See here my Garage-Door-Controller https://www.instructables.com/Garage-Door-Opener-Calling-by-Phone-Via-Arduino-an/

Here