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- /*
- It connects to an MQTT server then:
- - on 0 switches off relay
- - on 1 switches on relay
- - on 2 switches the state of the relay
- - sends 0 on off relay
- - sends 1 on on relay
- It will reconnect to the server if the connection is lost using a blocking
- reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
- achieve the same result without blocking the main loop.
- The current state is stored in EEPROM and restored on bootup
- */
- #include <ESP8266WiFi.h>
- #include <PubSubClient.h>
- #include <Bounce2.h>
- #include <EEPROM.h>
- const char* ssid = "xxxx";
- const char* password = "xxxx";
- const char* mqtt_server = "192.168.0.103";
- WiFiClient espClient;
- PubSubClient client(espClient);
- long lastMsg = 0;
- char msg[50];
- int value = 0;
- const char* outTopic = "Sonoff1out";
- const char* inTopic = "Sonoff1in";
- int relay_pin = 12;
- int button_pin = 0;
- bool relayState = LOW;
- // Instantiate a Bounce object :
- Bounce debouncer = Bounce();
- void setup_wifi() {
- delay(10);
- // We start by connecting to a WiFi network
- Serial.println();
- Serial.print("Connecting to ");
- Serial.println(ssid);
- WiFi.begin(ssid, password);
- while (WiFi.status() != WL_CONNECTED) {
- extButton();
- for(int i = 0; i<500; i++){
- extButton();
- delay(1);
- }
- Serial.print(".");
- }
- digitalWrite(13, LOW);
- delay(500);
- digitalWrite(13, HIGH);
- delay(500);
- digitalWrite(13, LOW);
- delay(500);
- digitalWrite(13, HIGH);
- Serial.println("");
- Serial.println("WiFi connected");
- Serial.println("IP address: ");
- Serial.println(WiFi.localIP());
- }
- void callback(char* topic, byte* payload, unsigned int length) {
- Serial.print("Message arrived [");
- Serial.print(topic);
- Serial.print("] ");
- for (int i = 0; i < length; i++) {
- Serial.print((char)payload[i]);
- }
- Serial.println();
- // Switch on the LED if an 1 was received as first character
- if ((char)payload[0] == '0') {
- digitalWrite(relay_pin, LOW); // Turn the LED on (Note that LOW is the voltage level
- Serial.println("relay_pin -> LOW");
- relayState = LOW;
- EEPROM.write(0, relayState); // Write state to EEPROM
- EEPROM.commit();
- client.publish(outTopic, "0");
- } else if ((char)payload[0] == '1') {
- digitalWrite(relay_pin, HIGH); // Turn the LED off by making the voltage HIGH
- Serial.println("relay_pin -> HIGH");
- relayState = HIGH;
- EEPROM.write(0, relayState); // Write state to EEPROM
- EEPROM.commit();
- client.publish(outTopic, "1");
- } else if ((char)payload[0] == '2') {
- relayState = !relayState;
- digitalWrite(relay_pin, relayState); // Turn the LED off by making the voltage HIGH
- Serial.print("relay_pin -> switched to ");
- Serial.println(relayState);
- EEPROM.write(0, relayState); // Write state to EEPROM
- EEPROM.commit();
- if (relayState == 1){
- client.publish(outTopic, "1");
- } else if (relayState == 0){
- client.publish(outTopic, "0");
- }
- }
- }
- void reconnect() {
- // Loop until we're reconnected
- while (!client.connected()) {
- Serial.print("Attempting MQTT connection...");
- // Attempt to connect
- if (client.connect("ESP8266Client")) {
- Serial.println("connected");
- // Once connected, publish an announcement...
- client.publish(outTopic, "Sonoff1 booted");
- // ... and resubscribe
- client.subscribe(inTopic);
- } else {
- Serial.print("failed, rc=");
- Serial.print(client.state());
- Serial.println(" try again in 5 seconds");
- // Wait 5 seconds before retrying
- for(int i = 0; i<5000; i++){
- extButton();
- delay(1);
- }
- }
- }
- }
- void extButton() {
- debouncer.update();
- // Call code if Bounce fell (transition from HIGH to LOW) :
- if ( debouncer.fell() ) {
- Serial.println("Debouncer fell");
- // Toggle relay state :
- relayState = !relayState;
- digitalWrite(relay_pin,relayState);
- EEPROM.write(0, relayState); // Write state to EEPROM
- if (relayState == 1){
- client.publish(outTopic, "1");
- }
- else if (relayState == 0){
- client.publish(outTopic, "0");
- }
- }
- }
- void setup() {
- EEPROM.begin(512); // Begin eeprom to store on/off state
- pinMode(relay_pin, OUTPUT); // Initialize the relay pin as an output
- pinMode(button_pin, INPUT); // Initialize the relay pin as an output
- pinMode(13, OUTPUT);
- relayState = EEPROM.read(0);
- digitalWrite(relay_pin,relayState);
- debouncer.attach(button_pin); // Use the bounce2 library to debounce the built in button
- debouncer.interval(50); // Input must be low for 50 ms
- digitalWrite(13, LOW); // Blink to indicate setup
- delay(500);
- digitalWrite(13, HIGH);
- delay(500);
- Serial.begin(115200);
- setup_wifi(); // Connect to wifi
- client.setServer(mqtt_server, 1883);
- client.setCallback(callback);
- }
- void loop() {
- if (!client.connected()) {
- reconnect();
- }
- client.loop();
- extButton();
- }
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