Moddable Holiday Wreath - powered by Node-RED MCU Edition

[phoddie]

The Moddable team built a holiday wreath entirely powered by Node-RED MCU Edition. This is the biggest Node-RED project I've worked on, with about three dozen nodes. Here's the flow:

flows.json

[
    {
        "id": "a012fade3b5d57bb",
        "type": "tab",
        "label": "wreath",
        "disabled": false,
        "info": "",
        "env": [],
        "_mcu": {
            "mcu": false
        }
    },
    {
        "id": "60a995290b2fe0a3",
        "type": "junction",
        "z": "a012fade3b5d57bb",
        "x": 720,
        "y": 800,
        "wires": [
            [
                "64ac0ae224ff9500",
                "52542f7625238930"
            ]
        ]
    },
    {
        "id": "993fb3df44b05e16",
        "type": "junction",
        "z": "a012fade3b5d57bb",
        "x": 778,
        "y": 226,
        "wires": [
            [
                "1680623367985eb1"
            ]
        ]
    },
    {
        "id": "55b2ce6c5f356fdb",
        "type": "junction",
        "z": "a012fade3b5d57bb",
        "x": 560,
        "y": 600,
        "wires": [
            [
                "4d8520215ecf3c89"
            ]
        ]
    },
    {
        "id": "e6e9d646477d897a",
        "type": "switch",
        "z": "a012fade3b5d57bb",
        "name": "which animation?",
        "property": "NeopixelMode",
        "propertyType": "flow",
        "rules": [
            {
                "t": "eq",
                "v": "random",
                "vt": "str"
            },
            {
                "t": "eq",
                "v": "wipe",
                "vt": "str"
            },
            {
                "t": "eq",
                "v": "sparkle",
                "vt": "str"
            },
            {
                "t": "else"
            }
        ],
        "checkall": "true",
        "repair": false,
        "outputs": 4,
        "_mcu": {
            "mcu": false
        },
        "x": 328,
        "y": 226,
        "wires": [
            [
                "5b8a97a2eef23c40"
            ],
            [
                "a1be3b24a70a023f"
            ],
            [
                "add3dc4b1f9798a8"
            ],
            [
                "c98462928a9ebe9a"
            ]
        ]
    },
    {
        "id": "5b8a97a2eef23c40",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "random colors",
        "func": "const palette = context.get(\"palette\");\nconst now = Date.now();\nif (palette.when <= now) {\n    const colors = context.get(\"colors\");\n    while (true) {\n        const color = colors[(Math.random() * colors.length) | 0];\n        if (palette.includes(color))\n            continue;\n        palette[Math.idiv(now, 1000) % palette.length] = color;\n        break;\n    }\n    palette.when += 1000;\n}\n\nconst pixels = flow.get(\"pixels\")\npixels.fill(undefined);\nfor (let i = 0, length = pixels.length; i < 4; i++)\n    pixels[(Math.random() * length) | 0] = palette[i & 3];\n\nmsg.colors = pixels;\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "function convert(colors) {\n    return colors.map(name => {\n        let value = Colors.getRGB(name);\n        return (value.r << 16) | (value.g << 8) | value.b\n    });\n}\n\nlet colors = convert([\"red\",\"green\",\"blue\",\"white\",\"cyan\",\"yellow\",\"purple\",\n        \"orange\",\"pink\",\"azure\",\"mintcream\"]);\nconst palette = convert([\"blue\", \"white\", \"green\", \"red\"]);\npalette.when = Date.now() + 1000;\ncontext.set(\"colors\", colors);\ncontext.set(\"palette\", palette);\n",
        "finalize": "",
        "libs": [
            {
                "var": "Colors",
                "module": "colors"
            }
        ],
        "_mcu": {
            "mcu": false
        },
        "x": 590,
        "y": 177,
        "wires": [
            [
                "993fb3df44b05e16"
            ]
        ]
    },
    {
        "id": "a1be3b24a70a023f",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "wipe down",
        "func": "const state = context.get(\"state\");\nconst points = state.points;\n\nstate.y += 0.33;\nif (state.y > (100 + 30)) {\n    state.y = 1;\n    state.phase += 1;\n    const c  = Colors.getRGB(state.palette[state.phase % state.palette.length]);\n    state.color = (c.r << 16) | (c.g << 8) | c.b\n}\nconst y = state.y;\nconst color = state.color;\nconst pixels = flow.get(\"pixels\");\nmsg.colors = pixels;\nfor (let i = 0, lightCount = state.lightCount; i < lightCount; i++) {\n    const delta = y - points[i].y\n    if (delta < 0)\n        continue;\n    if (delta > 20)\n        pixels[i] = color;\n    else if (Math.random() < 0.025)\n        pixels[i] = color;\n}\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "const lightCount = 100;\nconst scale = 50;\nconst points = [];\nfor (let i = 0; i < lightCount; i++) {\n\tconst r = (Math.PI * 2) * i / lightCount;\n\tlet x = Math.cos(r);\n\tlet y = Math.sin(r);\n\n\tx = Math.round(x * scale) + scale;\n\ty = Math.round(y * scale) + scale;\n\tpoints.push({x, y /* , index: i */});\n}\n\ncontext.set(\"state\", {\n    points,\n    lightCount,\n    y: 100,\n    phase: 0,\n    palette: [\"white\",\"blue\",\"red\",\"green\",\"yellow\",\"purple\"]\n});\n",
        "finalize": "",
        "libs": [
            {
                "var": "Colors",
                "module": "colors"
            }
        ],
        "_mcu": {
            "mcu": false
        },
        "x": 590,
        "y": 220,
        "wires": [
            [
                "993fb3df44b05e16"
            ]
        ]
    },
    {
        "id": "1680623367985eb1",
        "type": "rpi-neopixels",
        "z": "a012fade3b5d57bb",
        "name": "100 Neopixels",
        "gpio": 18,
        "pixels": "100",
        "bgnd": "16,16,16",
        "fgnd": "blue",
        "wipe": "0",
        "mode": "shiftu",
        "rgb": "grb",
        "brightness": "100",
        "gamma": false,
        "_mcu": {
            "mcu": false
        },
        "x": 898,
        "y": 226,
        "wires": []
    },
    {
        "id": "3302e770bc545890",
        "type": "complete",
        "z": "a012fade3b5d57bb",
        "name": "step animation",
        "scope": [
            "1680623367985eb1",
            "8b161be95b2f7721"
        ],
        "uncaught": false,
        "_mcu": {
            "mcu": false
        },
        "x": 118,
        "y": 226,
        "wires": [
            [
                "e6e9d646477d897a"
            ]
        ]
    },
    {
        "id": "051616a3c9cae336",
        "type": "inject",
        "z": "a012fade3b5d57bb",
        "name": "timer",
        "props": [],
        "repeat": "60",
        "crontab": "",
        "once": false,
        "onceDelay": "0.01",
        "topic": "",
        "_mcu": {
            "mcu": false
        },
        "x": 130,
        "y": 360,
        "wires": [
            [
                "304d2101548edd73"
            ]
        ]
    },
    {
        "id": "304d2101548edd73",
        "type": "random",
        "z": "a012fade3b5d57bb",
        "name": "",
        "low": "0",
        "high": "2",
        "inte": "true",
        "property": "payload",
        "_mcu": {
            "mcu": false
        },
        "x": 280,
        "y": 360,
        "wires": [
            [
                "4d93111f23e8d1af"
            ]
        ]
    },
    {
        "id": "4d93111f23e8d1af",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "choose animation",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "NeopixelModes[msg.payload]",
                "tot": "flow"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 470,
        "y": 360,
        "wires": [
            [
                "4d8520215ecf3c89"
            ]
        ]
    },
    {
        "id": "9bfa4623c08ca35e",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "change animation every 60 seconds",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 160,
        "y": 314,
        "wires": []
    },
    {
        "id": "3e3f3aa04abeb829",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "animate lights",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 90,
        "y": 160,
        "wires": []
    },
    {
        "id": "add3dc4b1f9798a8",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "color sparkle",
        "func": "const state = context.get(\"state\")\nconst pixels = flow.get(\"pixels\");\n\npixels.copyWithin(1, 0);\npixels[0] = state.colors[state.step++ % state.colors.length];\nmsg.colors = pixels;\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "const colors = [\n    \"0,0,16\",\n    \"0,0,32\",\n    \"0,0,64\",\n    \"0,0,96\",\n    \"0,0,128\",\n    \"0,0,160\",\n    \"0,0,192\",\n    \"0,0,224\",\n    \"0,0,240\",\n    \"0,0,255\",\n    \"0,0,240\",\n    \"0,0,224\",\n    \"0,0,192\",\n    \"0,0,160\",\n    \"0,0,128\",\n    \"0,0,96\",\n    \"0,0,64\",\n    \"0,0,32\",\n].map(c => {\n    c = c.split(\",\");\n    return (Number(c[0]) << 16) | (Number(c[1]) << 8) | Number(c[2]);\n});\n\ncontext.set(\"state\", {\n    colors,\n    step: 0\n});\n",
        "finalize": "",
        "libs": [],
        "_mcu": {
            "mcu": false
        },
        "x": 590,
        "y": 260,
        "wires": [
            [
                "993fb3df44b05e16"
            ]
        ]
    },
    {
        "id": "64682d54ae8459c3",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "change animation on button press",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 160,
        "y": 434,
        "wires": []
    },
    {
        "id": "eb8999b84364c341",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "change animation with MQTT message",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 170,
        "y": 554,
        "wires": []
    },
    {
        "id": "519460df2fb49336",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "initialize",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 70,
        "y": 40,
        "wires": []
    },
    {
        "id": "e241931089c1d46b",
        "type": "inject",
        "z": "a012fade3b5d57bb",
        "name": "start-up",
        "props": [],
        "repeat": "",
        "crontab": "",
        "once": true,
        "onceDelay": "0",
        "topic": "",
        "_mcu": {
            "mcu": false
        },
        "x": 140,
        "y": 80,
        "wires": [
            [
                "df6a43ea2958118d"
            ]
        ]
    },
    {
        "id": "df6a43ea2958118d",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "animation",
        "rules": [
            {
                "t": "set",
                "p": "NeopixelMode",
                "pt": "flow",
                "to": "random",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 280,
        "y": 80,
        "wires": [
            [
                "9032e9fcb5e67e6e"
            ]
        ]
    },
    {
        "id": "9032e9fcb5e67e6e",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "animation modes",
        "rules": [
            {
                "t": "set",
                "p": "NeopixelModes",
                "pt": "flow",
                "to": "[\"wipe\",\"random\",\"sparkle\"]",
                "tot": "json"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 450,
        "y": 80,
        "wires": [
            [
                "bf803df994a1ea21"
            ]
        ]
    },
    {
        "id": "c98462928a9ebe9a",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "off",
        "func": "const pixels = flow.get(\"pixels\")\n\npixels.fill(0);\nmsg.colors = pixels;\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "_mcu": {
            "mcu": false
        },
        "x": 590,
        "y": 300,
        "wires": [
            [
                "993fb3df44b05e16"
            ]
        ]
    },
    {
        "id": "6d66fe84cdb37819",
        "type": "rpi-gpio in",
        "z": "a012fade3b5d57bb",
        "name": "button",
        "pin": "0",
        "intype": "tri",
        "debounce": "25",
        "read": false,
        "bcm": true,
        "_mcu": {
            "mcu": false
        },
        "x": 101,
        "y": 480,
        "wires": [
            [
                "c5e2e9691d8db411"
            ]
        ]
    },
    {
        "id": "c5e2e9691d8db411",
        "type": "switch",
        "z": "a012fade3b5d57bb",
        "name": "button down?",
        "property": "payload",
        "propertyType": "msg",
        "rules": [
            {
                "t": "eq",
                "v": "0",
                "vt": "num"
            }
        ],
        "checkall": "true",
        "repair": false,
        "outputs": 1,
        "_mcu": {
            "mcu": false
        },
        "x": 269,
        "y": 480,
        "wires": [
            [
                "70e7a983d1ed05cb"
            ]
        ]
    },
    {
        "id": "70e7a983d1ed05cb",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "next animation",
        "func": "let NeopixelModes = flow.get(\"NeopixelModes\");\nlet NeopixelMode = flow.get(\"NeopixelMode\");\nlet index = (NeopixelModes.indexOf(NeopixelMode) + 1) % NeopixelModes.length;\nmsg.payload = NeopixelModes[index];\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "_mcu": {
            "mcu": false
        },
        "x": 460,
        "y": 480,
        "wires": [
            [
                "4d8520215ecf3c89"
            ]
        ]
    },
    {
        "id": "4d8520215ecf3c89",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "set animation",
        "rules": [
            {
                "t": "set",
                "p": "NeopixelMode",
                "pt": "flow",
                "to": "payload",
                "tot": "msg"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 700,
        "y": 480,
        "wires": [
            [
                "38883a439d434e96"
            ]
        ]
    },
    {
        "id": "38883a439d434e96",
        "type": "mqtt out",
        "z": "a012fade3b5d57bb",
        "name": "publish animation",
        "topic": "moddable/wreath/status/animation",
        "qos": "0",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "40068d0db5e8893c",
        "_mcu": {
            "mcu": false
        },
        "x": 930,
        "y": 480,
        "wires": []
    },
    {
        "id": "6308a1e76a85998c",
        "type": "mqtt in",
        "z": "a012fade3b5d57bb",
        "name": "receive animation",
        "topic": "moddable/wreath/set/animation",
        "qos": "0",
        "datatype": "auto-detect",
        "broker": "40068d0db5e8893c",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "_mcu": {
            "mcu": false
        },
        "x": 140,
        "y": 600,
        "wires": [
            [
                "55b2ce6c5f356fdb"
            ]
        ]
    },
    {
        "id": "52542f7625238930",
        "type": "audioout",
        "z": "a012fade3b5d57bb",
        "name": "stream song",
        "volume": "1.5",
        "_mcu": {
            "mcu": false
        },
        "x": 850,
        "y": 800,
        "wires": []
    },
    {
        "id": "6e6c088232a4230a",
        "type": "comment",
        "z": "a012fade3b5d57bb",
        "name": "stream song",
        "info": "",
        "_mcu": {
            "mcu": false
        },
        "x": 90,
        "y": 680,
        "wires": []
    },
    {
        "id": "e2fdebe581e407e3",
        "type": "complete",
        "z": "a012fade3b5d57bb",
        "name": "next song",
        "scope": [
            "52542f7625238930",
            "8b161be95b2f7721"
        ],
        "uncaught": false,
        "_mcu": {
            "mcu": false
        },
        "x": 112,
        "y": 730,
        "wires": [
            [
                "69d0727397f739f5"
            ]
        ]
    },
    {
        "id": "fe9cde216a0f89c3",
        "type": "random",
        "z": "a012fade3b5d57bb",
        "name": "",
        "low": "0",
        "high": "9",
        "inte": "true",
        "property": "payload",
        "_mcu": {
            "mcu": false
        },
        "x": 455,
        "y": 731,
        "wires": [
            [
                "3090e36098d2ae31"
            ]
        ]
    },
    {
        "id": "3090e36098d2ae31",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "map song",
        "rules": [
            {
                "t": "set",
                "p": "wave",
                "pt": "msg",
                "to": "Songs[msg.payload]",
                "tot": "flow"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 595,
        "y": 731,
        "wires": [
            [
                "60a995290b2fe0a3"
            ]
        ]
    },
    {
        "id": "bf803df994a1ea21",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "song list",
        "rules": [
            {
                "t": "set",
                "p": "Songs",
                "pt": "flow",
                "to": "[\"http://test.moddable.com/audio/ChristmasMusic/deck_halls.wav\",\"http://test.moddable.com/audio/ChristmasMusic/god_rest.wav\",\"http://test.moddable.com/audio/ChristmasMusic/hark.wav\",\"http://test.moddable.com/audio/ChristmasMusic/jesu.wav\",\"http://test.moddable.com/audio/ChristmasMusic/jingle.wav\",\"http://test.moddable.com/audio/ChristmasMusic/jingle.wav\",\"http://test.moddable.com/audio/ChristmasMusic/joy.wav\",\"http://test.moddable.com/audio/ChristmasMusic/norad.wav\",\"http://test.moddable.com/audio/ChristmasMusic/silent.wav\",\"http://test.moddable.com/audio/ChristmasMusic/wish_merry.wav\"]",
                "tot": "json"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 620,
        "y": 80,
        "wires": [
            [
                "0dc1b8193c78b5bf"
            ]
        ]
    },
    {
        "id": "2c276fe9386da0c3",
        "type": "mqtt out",
        "z": "a012fade3b5d57bb",
        "name": "publish song",
        "topic": "moddable/wreath/status/song",
        "qos": "0",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "40068d0db5e8893c",
        "_mcu": {
            "mcu": false
        },
        "x": 1045,
        "y": 731,
        "wires": []
    },
    {
        "id": "64ac0ae224ff9500",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "",
        "rules": [
            {
                "t": "move",
                "p": "wave",
                "pt": "msg",
                "to": "payload",
                "tot": "msg"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 855,
        "y": 731,
        "wires": [
            [
                "2c276fe9386da0c3"
            ]
        ]
    },
    {
        "id": "c657fa0f1c0ace9f",
        "type": "mqtt in",
        "z": "a012fade3b5d57bb",
        "name": "receive song request",
        "topic": "moddable/wreath/set/song",
        "qos": "0",
        "datatype": "auto-detect",
        "broker": "40068d0db5e8893c",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "_mcu": {
            "mcu": false
        },
        "x": 141,
        "y": 868,
        "wires": [
            [
                "84199ada332f7f13"
            ]
        ]
    },
    {
        "id": "84199ada332f7f13",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "set requested song",
        "rules": [
            {
                "t": "move",
                "p": "payload",
                "pt": "msg",
                "to": "wave",
                "tot": "msg"
            },
            {
                "t": "set",
                "p": "requestedSong",
                "pt": "flow",
                "to": "true",
                "tot": "bool"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 496,
        "y": 868,
        "wires": [
            [
                "60a995290b2fe0a3"
            ]
        ]
    },
    {
        "id": "69d0727397f739f5",
        "type": "switch",
        "z": "a012fade3b5d57bb",
        "name": "",
        "property": "requestedSong",
        "propertyType": "flow",
        "rules": [
            {
                "t": "null"
            },
            {
                "t": "else"
            }
        ],
        "checkall": "true",
        "repair": false,
        "outputs": 2,
        "_mcu": {
            "mcu": false
        },
        "x": 312,
        "y": 755,
        "wires": [
            [
                "fe9cde216a0f89c3"
            ],
            [
                "90fe2d2c33022e59"
            ]
        ]
    },
    {
        "id": "90fe2d2c33022e59",
        "type": "change",
        "z": "a012fade3b5d57bb",
        "name": "clear requested",
        "rules": [
            {
                "t": "delete",
                "p": "requestedSong",
                "pt": "flow"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "_mcu": {
            "mcu": false
        },
        "x": 475,
        "y": 786,
        "wires": [
            []
        ]
    },
    {
        "id": "a5edc4b251a33ed8",
        "type": "catch",
        "z": "a012fade3b5d57bb",
        "name": "streaming error",
        "scope": [
            "52542f7625238930"
        ],
        "uncaught": false,
        "_mcu": {
            "mcu": false
        },
        "x": 131,
        "y": 788,
        "wires": [
            [
                "69d0727397f739f5"
            ]
        ]
    },
    {
        "id": "0dc1b8193c78b5bf",
        "type": "function",
        "z": "a012fade3b5d57bb",
        "name": "pixels",
        "func": "const pixels = new Array(100);\npixels.fill(0);\nflow.set(\"pixels\", pixels);\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "_mcu": {
            "mcu": false
        },
        "x": 750,
        "y": 80,
        "wires": [
            [
                "8b161be95b2f7721"
            ]
        ]
    },
    {
        "id": "8b161be95b2f7721",
        "type": "debug",
        "z": "a012fade3b5d57bb",
        "name": "initialized",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "_mcu": {
            "mcu": false
        },
        "x": 880,
        "y": 80,
        "wires": []
    },
    {
        "id": "40068d0db5e8893c",
        "type": "mqtt-broker",
        "name": "test.mosquitto.org",
        "broker": "test.mosquitto.org",
        "port": "1883",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "userProps": "",
        "sessionExpiry": "",
        "credentials": {}
    }
]

Check out the Moddable blog for a post introducing the technologies used in the project, including the ESP32-S3 microcontroller, streaming audio, Neopixels, MQTT, and, of course, Node-RED MCU Edition.

I'm still something of a rookie at using Node-RED. I learned a lot building the flows for this project and discovered some techniques that work really well.I thought some of what I've learned might be helpful to others getting started with Node-RED and microcontrollers. I made a video that walks through the flow, node-by-node, explaining how they fit together to make the wreath work. It is a little long (sorry!) but hopefully helpful.