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Zigbee devices Lights and bulbs

SIMON SM0501

3 gang smart dimming switch. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
SIMON
Model
SM0501
Type
Lights and bulbs
Power
mains: usually a router that extends the mesh
Firmware updates (OTA)
no

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
Light (left)state, brightnesson / off, brightnesssettable
Light (center)state, brightnesson / off, brightnesssettable
Light (right)state, brightnesson / off, brightnesssettable
Light effect (left)effect_leftblink, breathe, okay, channel_change, finish_effect, stop_effectsettable
Light effect (center)effect_centerblink, breathe, okay, channel_change, finish_effect, stop_effectsettable
Light effect (right)effect_rightblink, breathe, okay, channel_change, finish_effect, stop_effectsettable
After power loss (left)power_on_behavior_leftoff, on, toggle, previoussettable
After power loss (center)power_on_behavior_centeroff, on, toggle, previoussettable
After power loss (right)power_on_behavior_rightoff, on, toggle, previoussettable

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "state_left": "ON",
  "brightness_left": 180,
  "state_center": "ON",
  "brightness_center": 180,
  "state_right": "ON",
  "brightness_right": 180,
  "power_on_behavior_left": "off",
  "power_on_behavior_center": "off",
  "power_on_behavior_right": "off",
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_left":"ON","brightness_left":180}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_left":"OFF","transition":2}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_center":"ON","brightness_center":180}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_center":"OFF","transition":2}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_right":"ON","brightness_right":180}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Light at sunset"
  mode: single
  triggers:
    - trigger: sun
      event: sunset
      offset: "-00:15:00"
  actions:
    - action: light.turn_on
      target:
        entity_id: light.my_device
      data:
        brightness_pct: 70

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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