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Multi Relay

This usermod-v2 modification allows the connection of multiple relays, each with individual delay and on/off mode.


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


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}]}


  • 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

  1. 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
  2. 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());



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)
  • 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.

Have fun - @blazoncek

Change log

2021-04 * First implementation.

2021-11 * Added information about dynamic configuration options * Added button support.

Fork specific info