Mayoogh Girish
Published © CC BY-SA

Amazon Alexa Smart Home Using NodeMCU

Ever thought of controlling things with your voice? I bet everyone has wanted to do it and to be like Tony Stark in Iron Man!

IntermediateFull instructions provided2,989

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board
NodeMCU ESP8266 Breakout Board
×1
Relay Module (Generic)
×1
Amazon Echo
Amazon Alexa Amazon Echo
×1

Software apps and online services

Arduino IDE
Arduino IDE
Alexa Voice Service
Amazon Alexa Alexa Voice Service

Story

Read more

Schematics

Circuit

Connect as per the given circuit

Code

Code snippet #4

Plain text
void turnOn(String deviceId)
{
  if (deviceId == "xxxxxxxxxx") // Device ID of device 1
  { 
    Serial.print("Turn on device id: ");
    Serial.println(deviceId);
    digitalWrite(device1, HIGH);
  }

Code snippet #5

Plain text
int device1 = 5;
int device2 = 4;
int device3 = 0;
int device4 = 2;
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsClient.h> // get it from https://github.com/Links2004/arduinoWebSockets/releases 
#include <ArduinoJson.h> // get it from https://arduinojson.org/ or install via Arduino library manager
#include <StreamString.h>

ESP8266WiFiMulti WiFiMulti;
WebSocketsClient webSocket;
WiFiClient client;

#define MyApiKey "" // TODO: Change to your sinric API Key. Your API Key is displayed on sinric.com dashboard
#define MySSID "" // TODO: Change to your Wifi network SSID
#define MyWifiPassword "" // TODO: Change to your Wifi network password

#define HEARTBEAT_INTERVAL 300000 // 5 Minutes

uint64_t heartbeatTimestamp = 0;
bool isConnected = false;

void setPowerStateOnServer(String deviceId, String value);
void setTargetTemperatureOnServer(String deviceId, String value, String scale);

// deviceId is the ID assgined to your smart-home-device in sinric.com dashboard. Copy it from dashboard and paste it here

void turnOn(String deviceId) {
 if (deviceId == "") // Device ID of device 1
 { 
 Serial.print("Turn on device id: ");
 Serial.println(deviceId);
 digitalWrite(device1, HIGH);
 } 
 else if (deviceId == "") // Device ID of device 2
 { 
 Serial.print("Turn on device id: ");
 Serial.println(deviceId);
 digitalWrite(device2, HIGH);
 }
 else if (deviceId == "") // Device ID of device 3
 { 
 Serial.print("Turn on device id: ");
 Serial.println(deviceId);
 digitalWrite(device3, HIGH);
 } 
 else if (deviceId == "") // Device ID of device 4
 { 
 Serial.print("Turn on device id: ");
 Serial.println(deviceId);
 digitalWrite(device4, HIGH);
 }
 else 
 {
 Serial.print("Turn on for unknown device id: ");
 Serial.println(deviceId); 
 } 
}

void turnOff(String deviceId) {
 if (deviceId == "") // Device ID of device 1
 { 
 Serial.print("Turn off Device ID: ");
 Serial.println(deviceId);
 digitalWrite(device1, LOW);
 }
 else if (deviceId == "") // Device ID of device 2
 { 
 Serial.print("Turn off Device ID: ");
 Serial.println(deviceId);
 digitalWrite(device2, LOW);
 }
 else if (deviceId == "") // Device ID of device 3
 { 
 Serial.print("Turn off Device ID: ");
 Serial.println(deviceId);
 digitalWrite(device3, LOW);
 }
 else if (deviceId == "") // Device ID of device 4
 { 
 Serial.print("Turn off Device ID: ");
 Serial.println(deviceId);
 digitalWrite(device4, LOW);
 }
 else 
 {
 Serial.print("Turn off for unknown device id: ");
 Serial.println(deviceId); 
 }
}

void webSocketEvent(WStype_t type, uint8_t * payload, size_t length) {
 switch(type) {
 case WStype_DISCONNECTED:
 isConnected = false; 
 Serial.printf("[WSc] Webservice disconnected from sinric.com!\n");
 break;
 case WStype_CONNECTED: {
 isConnected = true;
 Serial.printf("[WSc] Service connected to sinric.com at url: %s\n", payload);
 Serial.printf("Waiting for commands from sinric.com ...\n"); 
 }
 break;
 case WStype_TEXT: {
 Serial.printf("[WSc] get text: %s\n", payload);
 // Example payloads

// For Switch or Light device types
 // {"deviceId": xxxx, "action": "setPowerState", value: "ON"} // https://developer.amazon.com/docs/device-apis/alexa-powercontroller.html

// For Light device type
 // Look at the light example in github
 
 DynamicJsonBuffer jsonBuffer;
 JsonObject& json = jsonBuffer.parseObject((char*)payload); 
 String deviceId = json ["deviceId"]; 
 String action = json ["action"];
 
 if(action == "setPowerState") { // Switch or Light
 String value = json ["value"];
 if(value == "ON") {
 turnOn(deviceId);
 } else {
 turnOff(deviceId);
 }
 }
 else if (action == "SetTargetTemperature") {
 String deviceId = json ["deviceId"]; 
 String action = json ["action"];
 String value = json ["value"];
 }
 else if (action == "test") {
 Serial.println("[WSc] received test command from sinric.com");
 }
 }
 break;
 case WStype_BIN:
 Serial.printf("[WSc] get binary length: %u\n", length);
 break;
 }
}

void setup() 
{
 pinMode (device1, OUTPUT);
 pinMode (device2, OUTPUT);
 pinMode (device3, OUTPUT);
 pinMode (device4, OUTPUT);




Serial.begin(115200);
 
 WiFiMulti.addAP(MySSID, MyWifiPassword);
 Serial.println();
 Serial.print("Connecting to Wifi: ");
 Serial.println(MySSID);

// Waiting for Wifi connect
 while(WiFiMulti.run() != WL_CONNECTED) {
 delay(500);
 Serial.print(".");
 }
 if(WiFiMulti.run() == WL_CONNECTED) {
 Serial.println("");
 Serial.print("WiFi connected. ");
 Serial.print("IP address: ");
 Serial.println(WiFi.localIP());
 }

// server address, port and URL
 webSocket.begin("iot.sinric.com", 80, "/");

// event handler
 webSocket.onEvent(webSocketEvent);
 webSocket.setAuthorization("apikey", MyApiKey);
 
 // try again every 5000ms if connection has failed
 webSocket.setReconnectInterval(5000); // If you see 'class WebSocketsClient' has no member named 'setReconnectInterval' error update arduinoWebSockets
}

void loop() {
 
 webSocket.loop();
 
 if(isConnected) {
 uint64_t now = millis();
 
 // Send heartbeat in order to avoid disconnections during ISP resetting IPs over night. Thanks @MacSass
 if((now - heartbeatTimestamp) > HEARTBEAT_INTERVAL) {
 heartbeatTimestamp = now;
 webSocket.sendTXT("H"); 
 }
 } 
}

// If you are going to use a push button to on/off the switch manually, use this function to update the status on the server
// so it will reflect on Alexa app.
// eg: setPowerStateOnServer("deviceid", "ON")
void setPowerStateOnServer(String deviceId, String value) {
 DynamicJsonBuffer jsonBuffer;
 JsonObject& root = jsonBuffer.createObject();
 root["deviceId"] = deviceId;
 root["action"] = "setPowerState";
 root["value"] = value;
 StreamString databuf;
 root.printTo(databuf);
 
 webSocket.sendTXT(databuf);
}

//eg: setPowerStateOnServer("deviceid", "CELSIUS", "25.0")
void setTargetTemperatureOnServer(String deviceId, String value, String scale) {
 DynamicJsonBuffer jsonBuffer;
 JsonObject& root = jsonBuffer.createObject();
 root["action"] = "SetTargetTemperature";
 root["deviceId"] = deviceId;
 
 JsonObject& valueObj = root.createNestedObject("value");
 JsonObject& targetSetpoint = valueObj.createNestedObject("targetSetpoint");
 targetSetpoint["value"] = value;
 targetSetpoint["scale"] = scale;
 
 StreamString databuf;
 root.printTo(databuf);
 
 webSocket.sendTXT(databuf);
}

Github

https://github.com/kakopappa/sinric

Credits

Mayoogh Girish

Mayoogh Girish

5 projects • 124 followers
Maker Bloger @ https://igniteinnovateideas.wordpress.com

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