Amazon Echo ESP8266 control, with natural speech commands

Projects made with Blynk
158

HUGE IMPROVEMENTS since the last iteration!!!

I’ve replaced the WemoManager library that I was using with the Espalexa library, which solves several issues:

  1. It’s simpler to implement. One library. One callback.
  2. It resolves the issue that many were having with updated Echo devices not discovering correctly
  3. … and drumroll… It now allows LEVELS! You can specify any level from 0-100%.

For anyone who wants to dim a lamp, open the blinds halfway, or change the volume the stereo (@Pavlo @jon), it’s now possible. The Espalexa library takes advantage of Hue bulb emulation to expose a “brightness” parameter. That level, however you express it to Alexa, is converted to an unsigned integer 0-255 for us to use however we see fit.

Here’s the code that I used to test the functionality:

/* Wemo / Hue emulation for ESP8266 control with Alexa, Blynk and IFTTT.
 * 
 * https://github.com/tzapu/WiFiManager
 * https://github.com/Aircoookie/Espalexa
 * https://www.blynk.cc/
 * 
 * In order to control multiple devices with a single Blynk dashboard, each ESP8266
 * should be programmed with a unique virtual pin corresponding to a Blynk
 * dashboard widget (switch, slider, step). 
 * 
 * For IFTTT control, use the Maker Channel with the following settings:
 *    URL: http://blynk-cloud.com:8080/YOUR_TOKEN/V1       Substitute your own token and vitual pin 
 *    Method: PUT
 *    Content type: application/json
 *    Body: {"1"]                                          Use 0 for OFF, 1 for ON. For custom levels use 0-255.
 */

#include <ESP8266WiFi.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h> 
#include <Espalexa.h>
#include <ArduinoOTA.h>
#include <BlynkSimpleEsp8266.h>

// Blynk token and virtual pin number
#define VPIN V10  //Use a unique virtual pin for each device using the same Blynk token / dashboard
char auth[] = "TOKEN"; //Get token from Blynk

const int OutputPin = D1;      //Relay switching pin. Relay is pin 12 on the SonOff

Espalexa espalexa;

void setup(){ 
  Serial.begin(115200);
  
  WiFiManager wifi; 
  wifi.autoConnect("MyDevice"); // Connect to wifi
 
  espalexa.addDevice("Switch1", UpdateSwitch1); //Parameters: (device name, callback function).
  espalexa.begin();

  pinMode(OutputPin, OUTPUT);
  digitalWrite(OutputPin, LOW); 

  Blynk.config(auth);
  
  ArduinoOTA.begin();
}
 
void loop()
{
   espalexa.loop();
   Blynk.run();
   ArduinoOTA.handle();
}

//------------ Callback functions. Level can be set from 0-255. -------------
void UpdateSwitch1(uint8_t level) {   // Espalexa callback
  SetNewLevel(&level);  
}

BLYNK_WRITE(VPIN){                    // Blynk & IFTTT callback
  uint8_t level = param.asInt();
  SetNewLevel(&level); 
}

void SetNewLevel(uint8_t * pLevel){
  Serial.print("New level= ");
  Serial.println(*pLevel);
  
  if (*pLevel) {
    digitalWrite(OutputPin, HIGH); // Use analog.Writes for PWM control
  }
  else  {
    digitalWrite(OutputPin, LOW); 
  }
}

Enjoy!

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