Tharindu De Alwis
Published © GPL3+

Servo Light Switch (mqtt)

Turn your wall switch into a smart switch using this faceplate. Lights can be controlled via Home assistant. Two servos and a ESP32CAM board.

IntermediateShowcase (no instructions)5 hours4,085
Servo Light Switch (mqtt)

Things used in this project

Hardware components

ESP32-CAM
×1
SG90 Micro-servo motor
SG90 Micro-servo motor
×1

Software apps and online services

Home Assistant
Home Assistant
Arduino IDE
Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)

Story

Read more

Custom parts and enclosures

Face Plate

STL file to be 3D printed

Enclosure Lid

STL file to be printed

Schematics

Schematic

Code

Arduino Code

Arduino
Upload the code the ESP32-CAM boarding using the Arduino IDE.Change the wifi ,MQTT info before uploading the code
/************************************************************************************/

#include <WiFi.h>
#include <PubSubClient.h>
#include <ESP32_Servo.h>

/************ WIFI and MQTT INFORMATION (CHANGE THESE FOR YOUR SETUP) ******************/
#define wifi_ssid "NOTMINE" //enter your WIFI SSID
#define wifi_password "NOTMINE" //enter your WIFI Password

#define mqtt_server "192.168.1.1" // mqtt server
#define mqtt_user "" //enter your MQTT username
#define mqtt_password "" //enter your password
/*************************************************************************************/

/************************************VARIABLE SETUP***********************************/
WiFiClient espClient;
PubSubClient client(espClient);
Servo bottom;
Servo top;
int minUs = 500;
int maxUs = 2400;
int itsatrap = 0;




/************************************* VOID SETUP ****************************************/
void setup() {
  Serial.begin(115200);

  setup_wifi();

  client.setServer(mqtt_server, 1883); //CHANGE PORT HERE IF NEEDED
  client.setCallback(callback);
  pinMode(4, OUTPUT);
  top.attach(15, minUs, maxUs);
  bottom.attach(14, minUs, maxUs);

  //  Serial.println();
  //  Serial.print("MAC: ");
  //  Serial.println(WiFi.macAddress());



}
/*************************************************************************************/

/******************************** VOID WIFI SETUP *************************************/
void setup_wifi() {

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(wifi_ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(wifi_ssid, wifi_password);

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

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
/*************************************************************************************/

/*********************************** IMPORTANT LOOP **********************************/

void callback(char* topic, byte* payload, unsigned int length) {
  char p[length + 1];
  memcpy(p, payload, length);
  p[length] = NULL;
  String message(p);
  String mytopic(topic);
  Serial.println(mytopic);

  if (itsatrap == 0 && mytopic == "left/command" && message.equals("ON")) {
    
    bottom.write(0);
    client.publish("left/state", "ON");
    delay(500);
    bottom.write(90);

  }
  else if (mytopic == "left/command" && message.equalsIgnoreCase("OFF")) {

    top.write(180);
    client.publish("left/state", "OFF");
    delay(500);
    top.write(90);


  }
  else {
    itsatrap = 0;
  }

  if (itsatrap == 0 && mytopic == "right/direct" && message.equalsIgnoreCase("ON")) {

    bottom.write(180);
    client.publish("right/state", "ON");
    delay(500);
    bottom.write(90);

  }
  else if (mytopic == "right/direct" && message.equalsIgnoreCase("OFF")) {


    top.write(0);
    client.publish("right/state", "OFF");
    delay(500);
    top.write(90);

  }
  else {
    itsatrap = 0;
  }

  if (itsatrap == 0 && mytopic == "light/command" && message.equalsIgnoreCase("OFF")) {
    digitalWrite(4, LOW); //LED on
  }
  else if (mytopic == "light/command" && message.equalsIgnoreCase("ON")) {
    digitalWrite(4, HIGH); //LED off
  }

   else {
    itsatrap = 0;
  }

}
/*************************************************************************************/

/******************************** VOID LOOP ******************************************/
void loop() {

  if (!client.connected()) {
    reconnect();
  }



  client.loop();
}

/*************************************************************************************/

/***********************************VOID RECONNECT ***********************************/

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESPSwitch", mqtt_user, mqtt_password)) {
      Serial.println("connected");


      client.subscribe("left/command");
      client.subscribe("right/direct");
      client.subscribe("light/command");



    } else {
      Serial.print("failed, rc=");
      // Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
/***************************************END END END END ********************************/

Home Assitant Config.yaml

YAML
Paste this in the Config.yaml folder in HomeAssitant
light:
  - platform: mqtt
    name: "Left Switch"
    state_topic: "left/state"
    command_topic: "left/command"
    qos: 0
    payload_on: "ON"
    payload_off: "OFF"

    
  - platform: mqtt
    name: "Right Switch"
    state_topic: "right/state"
    command_topic: "right/direct"
    qos: 0
    payload_on: "ON"
    payload_off: "OFF"

  - platform: mqtt
    name: "Aux"
    command_topic: "light/command"  #Flashlight oon GPI04 on ESP32 Cam Module
    qos: 0
    payload_on: "ON"
    payload_off: "OFF"

Credits

Tharindu De Alwis

Tharindu De Alwis

1 project • 0 followers
Mehcanical Engineer.Love DIY stuff

Comments

Related channels and tags
  • Home Assistant
  • Home Automation