node-red-contrib-lcd20x4-i2c Example

README.md

Example of how to use node-red-contrib-lcd20x4-i2c

flow.json

[
    {
        "id": "5c7a63fc.d041e4",
        "type": "LCD20x4-I2C",
        "z": "514d8500.298c34",
        "name": "LCD2004",
        "speed": "3",
        "size": "20x4",
        "x": 520,
        "y": 160,
        "wires": []
    },
    {
        "id": "924c4048.97a328",
        "type": "function",
        "z": "514d8500.298c34",
        "name": "Message",
        "func": "// Line Number  Msg String      Start Position  Centered\n// 1            Date/Time       Ignored         true\n// 2            \"Test line 2.\"  2               false\n// 3            \"Test line 3.\"  3               false\n// 4            \"Test line 4.\"  4               false\n\n//var sString01 = \"Test line 1.\";\nvar sString01 = msg.payload;\nvar sString02 = \"Test line 2.\";\nvar sString03 = \"Test line 3.\";\nvar sString04 = \"Test line 4.\";\nvar iPos01 = 1;\nvar iPos02 = 2;\nvar iPos03 = 3;\nvar iPos04 = 4;\nvar bCenter01 = true;\nvar bCenter02 = false;\nvar bCenter03 = false;\nvar bCenter04 = false;\n\nmsg.payload = {\n\tmsgs:[\n\t\t{\n\t\t\tmsg:sString01,\n\t\t\tpos:iPos01,\n\t\t\tcenter:bCenter01\n\t\t},\n\t\t{\n\t\t\tmsg:sString02,\n\t\t\tpos:iPos02,\n\t\t\tcenter:bCenter02\n\t\t},\n\t\t{\n\t\t\tmsg:sString03,\n\t\t\tpos:iPos03,\n\t\t\tcenter:bCenter03\n\t\t},\n\t\t{\n\t\t\tmsg:sString04,\n\t\t\tpos:iPos04,\n\t\t\tcenter:bCenter04\n\t\t}\n\t]\n};\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "x": 320,
        "y": 160,
        "wires": [
            [
                "5c7a63fc.d041e4",
                "33adbf23.498828"
            ]
        ]
    },
    {
        "id": "33adbf23.498828",
        "type": "debug",
        "z": "514d8500.298c34",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": true,
        "tostatus": true,
        "complete": "payload",
        "x": 540,
        "y": 220,
        "wires": []
    },
    {
        "id": "f4f137d8.befd8",
        "type": "inject",
        "z": "514d8500.298c34",
        "name": "",
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "repeat": "1",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "x": 110,
        "y": 100,
        "wires": [
            [
                "dc6e3ed6.f4191"
            ]
        ]
    },
    {
        "id": "dc6e3ed6.f4191",
        "type": "moment",
        "z": "514d8500.298c34",
        "name": "",
        "topic": "",
        "input": "payload",
        "inputType": "msg",
        "inTz": "America/New_York",
        "adjAmount": 0,
        "adjType": "days",
        "adjDir": "add",
        "format": "ddd DD-MM HH:mm:ss",
        "locale": "en_US",
        "output": "payload",
        "outputType": "msg",
        "outTz": "America/New_York",
        "x": 140,
        "y": 160,
        "wires": [
            [
                "924c4048.97a328"
            ]
        ]
    },
    {
        "id": "b113533e.df98a8",
        "type": "comment",
        "z": "514d8500.298c34",
        "name": "Dependencies for Raspberry Pi & Node-Red",
        "info": "******************************************\n* First, Thanks for the LCD20x4-I2C node *\n*    stubby-phillips                     *\n* This is what worked for me.            *\n* RPi = 2b                               *\n* OS  = raspbian-stretch-lite.4.14.50-v7 *\n* Windows Manager = lxde                 *\n* Node-Red = v.0.19.4                    *\n******************************************\n* Notes to self:\n* Install python smbus library.\n*  At console run 'sudo apt update'\n*  At console run 'sudo apt-get install python-smbus'\n* Install python-pip (If 'Manage palette' option missing from Node-Red settings menu)\n*  At console run 'sudo apt-get install python-pip'\n* Reboot RPi..\n* \n* Add LCD20x4-I2C node to Node-Red.\n*  node-red-contrib-lcd20x4-i2c\n*   https://flows.nodered.org/node/node-red-contrib-lcd20x4-i2c\n*   https://www.npmjs.com/package/node-red-contrib-lcd20x4-i2c\n*   https://github.com/atsage/node-red-contrib-LCD20x4-I2C\n*  In Node-Red...\n*   Select User settings\n*    https://www.coursera.org/lecture/developer-nodered/mastering-the-node-red-menu-options-165iX\n*   Select Manage palette\n*    Select Install tab\n*     Search moduals for 'node-red-contrib-lcd20x4-i2c'\n*      Select Install button\n*       Select Install button\n*\n* Add node-red-contrib-moment node to Node-Red (Needed for this example only)\n*  Same as above but search for 'node-red-contrib-moment'\n* \n* Return to Node-Red example flow and select 'Deploy'\n*\n* Should show Day, Month/day,Date on line 1\n* Make sure you check pot on back of unit for correct contrast!\n*  Wasted about 2 hours on this.\n*",
        "x": 190,
        "y": 40,
        "wires": []
    }
]

Unfortunately I have been unable to get any results (just blank) on my 2004 LCD display with current version of Node Red v.1.3.5
https://discourse.nodered.org/t/trying-to-send-text-to-lcd-over-i2c-contrib/47873

Display works fine with Python scripts directly on RPi)