Nightscout Pixel

A JSON with the current Nightscout data is queried at a defined interval via the Nightscout V1 REST API (the implementation requires an access token created in the Subjects - People, Devices, etc. section of the Nightscout Admin Tools). The data from the JSON file is then processed in a function to display direction, sensor glucose value and delta. It can also be displayed if no more current data is available for a defined period of time. The icons and values are displayed via a custom app using MQTT (MQTT Broker is required).
wyMWodvk5nxX.json · 9.3 KB
[
    {
        "id": "7057b52ef757d606",
        "type": "tab",
        "label": "Awtrix-Nightscout-Pixel",
        "disabled": false,
        "info": "",
        "env": []
    },
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        "type": "inject",
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        "name": "Start",
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            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "5",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
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    {
        "id": "25b695a46aa59b69",
        "type": "change",
        "z": "7057b52ef757d606",
        "name": "Command: Data query",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "curl -H \"Content-Type: application/json\" -H \"Authorization: Bearer TOKEN\" -X GET https://NIGHTSCOUT_URL:PORT/api/v1/entries.json?count=1",
                "tot": "str"
            }
        ],
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        "type": "function",
        "z": "7057b52ef757d606",
        "name": "Function: Create Pixel",
        "func": "var glucose = msg.payload[0].sgv; // Data from Nightscout JSON\nvar delta = Math.round(msg.payload[0].delta);\nvar direction = msg.payload[0].direction;\nvar measuringtime = msg.payload[0].date;\nvar now = new Date();\nvar timestamp = now.getTime();\nvar nodataoffset = 660000; // Offset in milliseconds to the last measurement\nvar icon = \"\";\nvar color = \"\";\n\nif (delta >= 0) {\n    delta = '+' + delta; // Insert plus sign for positive delta\n}\n\nif ((measuringtime + nodataoffset) < timestamp) {\n    icon = 39552; // Set NoData icon if no data is available after the selected offset time\n} else { // Set icon depending on direction\n    if (direction == \"SingleUp\") {\n        icon = 39545;\n    } else if (direction == \"SingleDown\") {\n        icon = 39546;\n    } else if (direction == \"Flat\") {\n        icon = 39547;\n    } else if (direction == \"FortyFiveDown\") {\n        icon = 39548;\n    } else if (direction == \"FortyFiveUp\") {\n        icon = 39549;\n    } else if (direction == \"DoubleUp\") {\n        icon = 39550;\n    } else if (direction == \"DoubleDown\") {\n        icon = 39551;\n    } \n}\n\n// Create payload to display on Awtrix depending on glucose level\nif (glucose > 250) {\n\n    if ((measuringtime + nodataoffset) < timestamp) {\n        color = [255, 255, 255];\n    } else {\n        color = [247, 133, 31];\n    }\n\n    msg.payload = {\n        \"text\": glucose + ' ' + delta,\n        \"icon\": icon,\n        \"color\": color,\n        \"pushIcon\": 0,\n        \"save\": true,\n        \"textCase\": 2\n    };\n    return [{ payload: msg.payload }, null];\n} else if (glucose < 70) {\n\n    if ((measuringtime + nodataoffset) < timestamp) {\n        color = [255, 255, 255];\n    } else {\n        color = [255, 0, 0];\n    }\n\n    msg.payload = {\n        \"text\": glucose + ' ' + delta,\n        \"icon\": icon,\n        \"color\": color,\n        \"pushIcon\": 0,\n        \"save\": true,\n        \"textCase\": 2\n    };\n    return [{ payload: msg.payload }, null];\n} else if (glucose => 70 && glucose <= 250) {\n\n    if ((measuringtime + nodataoffset) < timestamp) {\n        color = [255, 255, 255];\n    } else {\n        color = [0, 255, 0];\n    }\n    \n    msg.payload = {\n        \"text\": glucose + ' ' + delta,\n        \"icon\": icon,\n        \"color\": color,\n        \"pushIcon\": 0,\n        \"save\": true,\n        \"textCase\": 2\n    };\n    return [{ payload: msg.payload }, null];\n}\n\nreturn msg;",
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        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
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    {
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        "type": "debug",
        "z": "7057b52ef757d606",
        "name": "Debug: Nightscout JSON",
        "active": false,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
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        "wires": []
    },
    {
        "id": "1ac6b90937457bf7",
        "type": "change",
        "z": "7057b52ef757d606",
        "name": "Command: Token request",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "curl -X GET https://NIGHTSCOUT_URL:PORT/api/v2/authorization/request/ACCESS_TOKEN -H \"Content-Type: application/json\"",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
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        "type": "json",
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        "type": "change",
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        "name": "save token",
        "rules": [
            {
                "t": "set",
                "p": "Nightscout.Token",
                "pt": "flow",
                "to": "payload.token",
                "tot": "msg"
            }
        ],
        "action": "",
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        "reg": false,
        "x": 730,
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    },
    {
        "id": "1e1f42891a8b5b97",
        "type": "change",
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        "name": "insert token",
        "rules": [
            {
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                "p": "payload",
                "pt": "msg",
                "from": "TOKEN",
                "fromt": "str",
                "to": "Nightscout.Token",
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            }
        ],
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    },
    {
        "id": "d3ef3ba51867a7aa",
        "type": "mqtt out",
        "z": "7057b52ef757d606",
        "name": "Nightscout Custom App",
        "topic": "PREFIX/custom/Nightscout",
        "qos": "1",
        "retain": "false",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
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    {
        "id": "326ea0d44da2b88f",
        "type": "mqtt-broker",
        "name": "",
        "broker": "",
        "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": ""
    }
]
These icons belong on the device, in /ICONS. Each one is at most 32×8 pixels — shown here at actual proportions, magnified.