text-lcd-16x4-i2c

dox/lcd-i2c/text-lcd-16x4-i2c

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text-lcd-16x4-i2c
@/text-lcd-16x4-i2c
ADDRnumber
I²C address of the expander chip.
BLboolean
Backlight enable/disable
L1string
Text for the first line
L2string
Text for the second line
L3string
Text for the third line
L4string
Text for the fourth line
text-lcd-16x4-i2c
ADDR
BL
L1
L2
L3
L4
To use the node in your project you should have the dox/lcd-i2c library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

C++ implementation

{{#global}}
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
{{/global}}

struct State {
    LiquidCrystal_I2C* lcd;
};

{{ GENERATED_CODE }}

void printLine(LiquidCrystal_I2C* lcd, uint8_t lineIndex, XString str) {
    lcd->setCursor(0, lineIndex);
    uint8_t whitespace = 16;
    for (auto it = str.iterate(); it; ++it, --whitespace)
        lcd->write(*it);

    // Clear the rest of the line
    while (whitespace--)
        lcd->write(' ');
}

void evaluate(Context ctx) {
    State* state = getState(ctx);
    auto lcd = state->lcd;
    if (!state->lcd) {
        uint8_t addr = getValue<input_ADDR>(ctx);
        state->lcd = lcd = new LiquidCrystal_I2C(addr, 16, 4);
        lcd->begin();
    }

    printLine(lcd, 0, getValue<input_L1>(ctx));
    printLine(lcd, 1, getValue<input_L2>(ctx));
    printLine(lcd, 2, getValue<input_L3>(ctx));
    printLine(lcd, 3, getValue<input_L4>(ctx));
    lcd->setBacklight(getValue<input_BL>(ctx));
}