Hi guys,
i need help or some pointers in the right direction, because im new in the Openhab world and also im little bit confused 
.
So i have AC mini split system to cool down my gear in the summer and i managed to turn it on through relay with openhab, but the problem is when the power outage happens the AC unit is off and it not come back on. How can i make some rule or something that checks every minute the last state that i pressed OFF or ON and if it is OFF when the power outage happens to turn back ON, but also to notify me by email . I can put relay on my AC to check if its ON or OFF and connect it to Arduino.
Thanks in advance!!!
Here is my Arduino.ino
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
// for DHT22 sensor
#include "DHT.h"
#define DHT1PIN 2
#define DHT1TYPE DHT22
#define DHT2PIN 7
#define DHT2TYPE DHT22
DHT dht1(DHT1PIN, DHT1TYPE);
DHT dht2(DHT2PIN, DHT2TYPE);
unsigned long readTime;
#define relay1 4
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,1,120);
IPAddress server(192, 168, 1, 106);
char message_buff[100]; // this buffers our incoming messages so we can do something on certain commands
EthernetClient ethClient;
PubSubClient client(ethClient);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
String readString;
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
int i=0;
for (i=0;i<length;i++) {
Serial.print((char)payload[i]);
message_buff[i] = payload[i];
}
message_buff[i] = '\0';
String msgString = String(message_buff);
if (msgString.equals("OFF")) {
client.publish("openhab/floor1/command","acknowedging OFF");
}
else if(msgString.equals("ON")){
client.publish("openhab/floor1/command","acknowedging ON");
}
Serial.println();
//Bounce relay
if ( msgString == "ON" ) {
digitalWrite(relay1,HIGH); }
if ( msgString == "OFF" ) {
digitalWrite(relay1,LOW);
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("arduinoClient")) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("openhab","floor1 sensor, reporting in");
// ... and resubscribe
client.subscribe("openhab/floor1/command");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup()
{
pinMode(relay1,OUTPUT);
dht1.begin();
dht2.begin();
// Open serial communications and wait for port to open:
Serial.begin(57600);
client.setServer("192.168.1.106", 1883);
client.setCallback(callback);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
delay(1500);
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
readTime = 0;
}
void loop()
{
if (!client.connected()) {
reconnect();
}
client.loop();
/// publish reading every 10 seconds
if(millis() > readTime+10000){
sensorRead();
}
}
void sensorRead(){
readTime = millis();
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
// get data from DHT22 sensor
float h1 = dht1.readHumidity();
float t1 = dht1.readTemperature();
float h2 = dht2.readHumidity();
float t2 = dht2.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h1) || isnan(t1) || isnan(h2) || isnan(t2)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// Compute heat index in Fahrenheit (the default)
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht1.computeHeatIndex(t1, h1, false);
float hic1 = dht2.computeHeatIndex(t2, h2, false);
char buffer[10];
dtostrf(t1,0, 0, buffer);
client.publish("openhab/floor1/temperature1",buffer);
//Serial.println(buffer);
dtostrf(h1,0, 0, buffer);
client.publish("openhab/floor1/humidity1",buffer);
dtostrf(t2,0, 0, buffer);
client.publish("openhab/floor1/temperature2",buffer);
//Serial.println(buffer);
dtostrf(h2,0, 0, buffer);
client.publish("openhab/floor1/humidity2",buffer);
client.subscribe("openhab/floor1/relay1");
//client.publish("inTopic/humidity",sprintf(buf, "%f", h));
/*Serial.print("Humidity1: ");
Serial.print(h1);
Serial.print(" %\t");
Serial.print("Temperature1: ");
Serial.print(t1);
Serial.print(" *C ");
Serial.print(h2);
Serial.print(" %\t");
Serial.print("Temperature2: ");
Serial.print(t2);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *F\t");
Serial.print("Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.println(" *F"); */
}
default.items
/* MQTT Sensors */
Number Floor1_Temp "Floor1 Temperature 1 [%.1f °C]" <temperature> (Floor1,Temperature) {mqtt="<[mymosquitto:openhab/floor1/temperature1:state:default]"}
Number Floor1_Humidity "Floor1 Humidity 1 [%.1f %%]" <water> (Floor1,Humidity) {mqtt="<[mymosquitto:openhab/floor1/humidity1:state:default]"}
Number Floor1_Temp2 "Floor1 Temperature 2 [%.1f °C]" <temperature> (Floor1,Temperature) {mqtt="<[mymosquitto:openhab/floor1/temperature2:state:default]"}
Number Floor1_Humidity2 "Floor1 Humidity 2 [%.1f %%]" <water> (Floor1,Humidity) {mqtt="<[mymosquitto:openhab/floor1/humidity2:state:default]"}
Switch Relay1 "Relay" <garagedoor> (All) {mqtt=">[mymosquitto:openhab/floor1/relay1:command:ON:ON],>[mymosquitto:openhab/floor1/relay1:command:OFF:OFF]"}
default.sitemap
sitemap default label="Main Menu"
{
Frame label="Floor1_Temp" {
Text item=Floor1_Temp
}
Frame label="Floor1_Humidity" {
Text item=Floor1_Humidity
}
Frame label="Floor1_Temp2" {
Text item=Floor1_Temp2
}
Frame label="Floor1_Humidity2" {
Text item=Floor1_Humidity2
}
Switch item=Relay1 mappings=[OFF="OFF", ON="ON"]
Chart item=Floor1_Temp period=D
Chart item=Floor1_Temp2 period=D
{