Blinking - cflurin/node-red-contrib-dsm GitHub Wiki

A dsm for blinking a LED (Raspberry Pi pin). Feature: the next start input is only triggered after the sequence is finished or after a stop input.

Settings are provided for on/off time and the number of blinks. Set the sm.data.blinks to continuing if you don't want to limit the number of blinks. Optionally the output (default 1/0) can be set to true/false, "on"/"off" or whatever you need.

Configuration

{
    "currentState": "idle",
    "states": {
        "idle": {
            "start": "on",
            "stop": "idle"
        },
        "on": {
            "turn_off": "off",
            "stop": "idle"
        },
        "off": {
            "turn_on": "on",
            "stop": "idle"
    }
    },
    "data": {
        "on": 1,
        "off": 0,
        "on_time": 1000,
        "off_time": 1000,
        "blinks": 3,
        "count": 0
    },
    "methods": {
        "init": [
            "sm.schedule = function(tran, delay, msg) {",
            "   timeout.id = setTimeout(function() {",
            "       resume(tran, msg)",
            "   },delay);",
            "};",
            "sta.fill = 'grey';"
        ],
        "onBeforeTransition": [
            "if (!msg.topic) msg.topic = 'start';",
            "if (msg.blinks) sm.data.blinks = msg.blinks;",
            "if (msg.on_time) sm.data.on_time = msg.on_time;",
            "if (msg.off_time) sm.data.off_time = msg.off_time;"
        ],
        "start": [
            "sm.data.count = sm.data.blinks;",
            "resume('turn_on', msg);",
            "output = false;"
        ],
        "turn_on": [
            "if (sm.data.count) {",
            "   sm.schedule('turn_off', sm.data.on_time, msg);",
            "   if(sm.data.blinks !== 'continuing') sm.data.count--;",
            "   sm.fill = 'yellow';",
            "   msg.payload = sm.data.on;",
            "   output = true;",
            "} else {",
            "   sm.currentState = 'idle';",
            "   sm.fill = 'grey';",
            "   output = false;",
            "}"
        ],
        "turn_off": [
            "sm.schedule('turn_on', sm.data.off_time, msg);",
            "sm.fill = 'blue';",
            "msg.payload = sm.data.off;"
        ],
        "stop": [
            "clearTimeout(timeout.id);",
            "sm.fill = 'grey';",
            "msg.payload = sm.data.off;"
        ],
        "status": {
            "fill": {
                "get": "sm.fill;"
            },
            "shape": "dot",
            "text": {
                "get": "sm.currentState;"
            }
        }
    }
}

Flow

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