India Automation Challenge 2021
OR
Automating products impacting one's daily routine saves time, cost and reduces one's hassle to monitor it continuously. Automated switches as described here is one great example. Integrating it with an voice assistant gives us a way more comfiness. Consider having to enter your home with a bag full of groceries. One has to learn martial arts to be able to switch ON the lights of a dark room along with full impending weight of the groceries(pun intended). That's where our Alexa-switch comes into play. The main pitch for the Project is to control(ON/OFF) the devices with voice control. It is very common nowadays to use home assistants like Alexa, google assistant, etc. And if we want to switch ON/OFF the devices of our home with that home assistants, it costs more to install new smart devices. So comes the Alexa-Switch that we can connect it to the devices that we want, and switch ON/OFF the device with the voice control. We can choose the name we want for the device. Here I used Fan, Light as the name of the device.
2 Relay module, ESP01, AMS1117
Arduino IDE
Hardware: 2 Relay module - to switch ON/OFF the device when the signal is received. ESP01 - it is the microcontroller used for collecting information from Alexa and tells the Relay to turn ON/OFF. AMS1117 - to convert 5v to 3.3v, as it is the right voltage for the microcontroller. Software: Arduino IDE.
The 5v supply is connected AMS1117 and it is connected to the Vcc and ground of the ESP01 to power the ESP01 microcontroller and to turn ON/OFF the Relay. The devices are connected to the Relay.
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <WebSocketsClient.h>
#include <ArduinoJson.h>
#include <StreamString.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>
WebSocketsClient webSocket;
WiFiClient client;
#define MyApiKey "d170ba86-9fd1-4bf8-90f0-8dd02b0c2a39" // TODO: Change to your sinric API Key. Your API Key is displayed on sinric.com dashboard
#define MySSID "mani" // TODO: Change to your Wifi network SSID
#define MyWifiPassword "qwerty123" // TODO: Change to your Wifi network password
#define HEARTBEAT_INTERVAL 300000 // 5 Minutes
uint64_t heartbeatTimestamp = 0;
bool isConnected = false;
// deviceId is the ID assgined to your smart-home-device in sinric.com dashboard.
void turnOn(String deviceId) {
if (deviceId == "5d146e15e32b137cab0dcb36") // Device ID of first device
{
Serial.print("Turn on device id: ");
Serial.println(deviceId);
digitalWrite(0, LOW);
}
else if (deviceId == "5d14dd35e32b137cab0dcc26") // Device ID of second device
{
Serial.print("Turn on device id: ");
Serial.println(deviceId);
digitalWrite(2, LOW);
}
}
void turnOff(String deviceId) {
if (deviceId == "5d146e15e32b137cab0dcb36") // Device ID of first device
{
Serial.print("Turn off Device ID: ");
Serial.println(deviceId);
digitalWrite(0, HIGH);
}
else if (deviceId == "5d14dd35e32b137cab0dcc26") // Device ID of second device
{
Serial.print("Turn off Device ID: ");
Serial.println(deviceId);
digitalWrite(2, HIGH);
}
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"}
// 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() {
Serial.begin(115200);
WiFiManager wifiManager;
wifiManager.autoConnect("AutoConnectAP");
Serial.println("connected...yeey :)");
// 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);
pinMode(0, OUTPUT);
pinMode(2, OUTPUT);
digitalWrite(0, HIGH);
digitalWrite(2, HIGH);
}
void loop() {
webSocket.loop();
if(isConnected) {
uint64_t now = millis();
// Send heartbeat in order to avoid disconnections during ISP resetting IPs over night.
if((now - heartbeatTimestamp) > HEARTBEAT_INTERVAL) {
heartbeatTimestamp = now;
webSocket.sendTXT("H");
}
}
}