UPDATE: Please do not overwrite your fcn_declare.h with mine instead make sure in the standard fcn_declare.h you add

void relaysOnAlexaChange(EspalexaDevice* dev);

in the following section

#ifndef WLED_DISABLE_ALEXA
void onAlexaChange(EspalexaDevice* dev);
void alexaInit();
void handleAlexa();
void onAlexaChange(EspalexaDevice* dev);
void relaysOnAlexaChange(EspalexaDevice* dev);
#endif

wled-alexa-relay-usermod

Controllable by Alexa - Multi Relay

(Please still consider this a beta - only users will tell how well it works)

So I really wanted the same esp32 to control both my SR Leds and my normal AC lights through alexa without having multiple contollers. I also wanted additional relay to control the DC PSU as that sits in the attic. Nothing quite matched my needs so I built excellent work done by many others.

This usermod is a modificaiton of the original Multi-Relay usermod built by blazoncek. Since relays will now be exposed as additioanl devices to Alexa the base WLED build which uses Virtual Alexa devices to execute presets has been replaced with presets now being enabled by calling brightness events from 1-9. Total brightness range is (1-100). For e.g.

"Alexa turn device brightness to 1" will execute preset 1
"Alexa turn device brightness to 2" will execute preset 2   and so on. 
You can also say
"Alexa set device to 1" to execute preset 1 etc

Please note that the atual brightess send by alexa can be off by a little depending on your retirement so the actual could be off by 1 either up or down. So you might get Preset 1 or Present3(more likely) when you are expecting preset 2 - butit will be consistent for your device once you figure out what it is

The assumption here being for brightness from 1-10 most people will not care much, as rarely will you call brightness below 10. Number of presets that can be mapped to each brightness value is controlled by (ESPALEXA_MAXDEVICES - 1) and is set to 9 by default as the original

Original relay modification allowed the connection of multiple relays, each with individual delay and on/off mode. This enhancement makes each of the relays cotrollable from the WLED info setup as well as enabling the relay controls through Alexa.

None of the original capabilities of the nulti-relay usermod have been modified or diminished in any way and still as usable as before. the below text is from that orginal mod modfied for alexa controls

Currently alexa can send state changes to wled relays and they are reflected in all the wled interfaces. However, I currently do not propagate the state changes that happen outside of alexa back to alexa - just havent figure out what the right UDP packet to send it as yet. However, alexa constantly polls the system for updated state to it updates itself - a slight delay but alexa eventually synchs up the state

HTTP API

I have not modified or used the original HTTP API or MQTT topics in any way.

<=========================>

All responses are returned in JSON format.

Status Request: http://[device-ip]/relays
Switch Command: http://[device-ip]/relays?switch=1,0,1,1

The number of values behind the switch parameter must correspond to the number of relays. The value 1 switches the relay on, 0 switches it off.

Toggle Command: http://[device-ip]/relays?toggle=1,0,1,1

The number of values behind the parameter switch must correspond to the number of relays. The value 1 causes the relay to toggle, 0 leaves its state unchanged.

Examples:

total of 4 relays, relay 2 will be toggled: http://[device-ip]/relays?toggle=0,1,0,0
total of 3 relays, relay 1&3 will be switched on: http://[device-ip]/relays?switch=1,0,1

JSON API

You can toggle the relay state by sending the following JSON object to: http://[device-ip]/json

Switch relay 0 on: {"MultiRelay":{"relay":0,"on":true}}

Switch relay 3 and 4 off: {"MultiRelay":[{"relay":2,"on":false},{"relay":3,"on":false}]}

MQTT API

wled/deviceMAC/relay/0/command on|off|toggle
wled/deviceMAC/relay/1/command on|off|toggle

When a relay is switched, a message is published:

wled/deviceMAC/relay/0 on|off

Usermod installation

Register the usermod by adding #include "../usermods/multi_relay/usermod_multi_relay.h" at the top and usermods.add(new MultiRelay()); at the bottom of usermods_list.cpp. or
Use #define USERMOD_MULTI_RELAY in wled.h or -D USERMOD_MULTI_RELAY in your platformio.ini

You can override the default maximum number of relays (which is 4) by defining MULTI_RELAY_MAX_RELAYS.

Example usermods_list.cpp:

#include "wled.h"
/*
 * Register your v2 usermods here!
 *   (for v1 usermods using just usermod.cpp, you can ignore this file)
 */

/*
 * Add/uncomment your usermod filename here (and once more below)
 * || || ||
 * \/ \/ \/
 */
//#include "usermod_v2_example.h"
//#include "usermod_temperature.h"
#include "../usermods/usermod_multi_relay.h"

void registerUsermods()
{
  /*
   * Add your usermod class name here
   * || || ||
   * \/ \/ \/
   */
  //usermods.add(new MyExampleUsermod());
  //usermods.add(new UsermodTemperature());
  usermods.add(new MultiRelay());

}

I have modfied the alexa.cpp file signficantly and the fcn_declare.h to declare an additioanl alexa callback routine.

Configuration

Usermod can be configured via the Usermods settings page.

enabled - enable/disable usermod
pin - ESP GPIO pin the relay is connected to (can be configured at compile time -D MULTI_RELAY_PINS=xx,xx,...)
delay-s - delay in seconds after on/off command is received
active-high - assign high/low activation of relay (can be used to reverse relay states)
external - if enabled, WLED does not control relay, it can only be triggered by an external command (MQTT, HTTP, JSON or button)
alexa-enabled - if enabled here and Alexa Control is eabled in sync interfaces, the relays will be automatically disoverable by Alexa
alexa-invocation-name - device name that will show up in WLED info page and during Alexa discovery/add device workflow
button - button (from LED Settings) that controls this relay
broadcast- time in seconds between MQTT relay-state broadcasts
HA-discovery- enable Home Assistant auto discovery

If there is no MultiRelay section, just save current configuration and re-open Usermods settings page.

sgupta999/wled-alexa-relay-usermod