remotepi

Control a Marantz PM6007 stereo receiver and LED strip via IR/wired signals, integrated with Home Assistant through MQTT.

Features

Marantz Control: Sends ON/OFF signals to Marantz receivers when ALSA audio streams start/stop
LED Strip Control: Control RGBW LED strips via IR through Home Assistant MQTT
Home Assistant Integration: Automatic MQTT discovery for LED strip

Hardware Setup

GPIO 27 (Pin 13): Marantz wired remote control
GPIO 17 (Pin 11): LED strip IR transmitter

Configuration

Environment variables:

Variable	Default	Description
`MQTT_BROKER`	`tcp://localhost:1883`	MQTT broker URL
`MQTT_CLIENT_ID`	`remotepi`	MQTT client identifier
`MQTT_USERNAME`	(empty)	MQTT username (optional)
`MQTT_PASSWORD`	(empty)	MQTT password (optional)
`MARANTZ_PIN`	`27`	GPIO pin for Marantz control
`LED_PIN`	`17`	GPIO pin for LED IR transmitter
`OFF_DELAY`	`2m`	Delay before turning off Marantz
`AUDIO_CARD`	`card2`	ALSA audio card to monitor

Installation

Systemd Service (LibreELEC/Raspberry Pi OS)

cat <<EOF > /storage/.config/system.d/remotepi.service
[Unit]
Description=RemotePi Service - Marantz and LED Control
After=network.target

[Service]
Type=simple
Environment=MQTT_BROKER=tcp://192.168.1.10:1883
Environment=MQTT_USERNAME=your_username
Environment=MQTT_PASSWORD=your_password
Environment=MARANTZ_PIN=27
Environment=LED_PIN=17
Environment=OFF_DELAY=2m
Environment=AUDIO_CARD=card2
ExecStart=/storage/.kodi/remotepi
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable remotepi
systemctl start remotepi

Home Assistant Integration

The LED strip appears automatically in Home Assistant via MQTT discovery.

MQTT Topics:

Discovery: homeassistant/light/remotepi_ledstrip/config
Command: homeassistant/light/remotepi_ledstrip/set
State: homeassistant/light/remotepi_ledstrip/state

Example command payload:

{
  "state": "ON",
  "brightness": 200,
  "color": {"r": 255, "g": 0, "b": 0},
  "effect": "none",
  "transition": 2
}

Supported effects: none, flash, fade, smooth, strobe

Transitions

The transition parameter (in seconds) enables smooth brightness changes:

HA will send transition: 2 for a 2-second fade
Commands are queued and spaced 100ms apart
Brightness changes are spread over the transition duration

Without transition, brightness changes are instant (within IR processing limits).

Brightness Step (Dimmer Support)

For rotary dimmers or hold-to-dim switches (e.g., EnOcean Friends of Hue), use brightness_step:

{
  "state": "ON",
  "brightness_step": 25
}

Positive values increase brightness
Negative values decrease brightness
Optimized for rapid events: sends 1-5 IR commands per step
No queue backup: immediate response per event

EnOcean/Zigbee Dimmer Integration

For EnOcean Friends of Hue switches via Zigbee2MQTT, create an automation in Home Assistant:

automation:
  - alias: "LED Strip Dimmer"
    trigger:
      - platform: mqtt
        topic: "zigbee2mqtt/your_switch"
    action:
      - service: mqtt.publish
        data:
          topic: "homeassistant/light/remotepi_ledstrip/set"
          payload: >
            {% if trigger.payload_json.action == 'brightness_move_up' %}
            {"state": "ON", "brightness_step": 20}
            {% elif trigger.payload_json.action == 'brightness_move_down' %}
            {"state": "ON", "brightness_step": -20}
            {% elif trigger.payload_json.action == 'brightness_stop' %}
            {}
            {% elif trigger.payload_json.action == 'toggle' %}
            {"state": "ON"}
            {% endif %}

LED Color Mapping

Since the LED controller only has preset colors, RGB values are mapped to the nearest available preset:

Red, Green, Blue, White
12 additional color presets

Brightness is controlled by sending BRIGHTNESSUP/DOWN commands based on the difference from current level.

Build

go build -o remotepi .

Dependencies

github.com/stianeikeland/go-rpio/v4 - Raspberry Pi GPIO
github.com/morphar/powernap - Precise timing for IR signals
github.com/eclipse/paho.mqtt.golang - MQTT client

jekkos/remotepi

README