node-red-contrib-lcd20x4-i2c 0.1.1

Driver for 20x4 HD44780 LCD Display connected via I2C PCF8574

npm install node-red-contrib-lcd20x4-i2c

This node is a driver for 20x4 HD44780 LCD Display connected via I2C PCF8574

Dependencies: SMBus, enable i2c in raspi-config

sudo apt-get install python-smbus
sudo raspi-config
    Interfacing Options>I2C>Enable

This node will accept an object msg.payload.msgs. If the object passed does not contain 4 lines, the difference is filled with blank lines.

Line data structure:

  • msg must be a string.
    • If msg is more than 20 characters the node will handle scrolling.
  • pos (position) is optional and must be a number with any value between 1-20. This value is used for offsetting text, but you can also insert spaces in to msg instead of supplying pos.
    • If pos is not supplied it will default to 1.
  • center is optional and must be a boolean value passed as a string
    • If pos and center are both set, center will override pos.

If there is an error it will be logged to Node-RED and display an error on the LCD screen.

Object format:

msg.payload = {
    msgs: [
        {
            msg: "string",
            pos: number,
            center: "boolean"
        },
        {
            msg: "string",
            pos: number,
            center: "boolean"
        },
        {
            msg: "string",
            pos: number,
            center: "boolean"
        },
        {
            msg: "string",
            pos: number,
            center: "boolean"
        }
    ]
};

Node Info

Version: 0.1.1
Updated 3 years, 4 months ago
License: MIT
Rating: 5.0 4

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Nodes

  • LCD20x4-I2C

Keywords

  • node-red
  • 20x4
  • LCD
  • 20x4 LCD
  • PCF8574
  • PCF8574T
  • PCF8574AT
  • HD44780

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