driver-hd44780

HD44780 LCD driver for Android Things

This driver supports LCD peripherals built on the HD44780 chip and controlled with the PCF8574 chip.

NOTE: these drivers are not production-ready. They are offered as sample implementations of Android Things user space drivers for common peripherals as part of the Developer Preview release. There is no guarantee of correctness, completeness or robustness.

This driver is based on the lcd-pcf8574-androidthings driver from Nilhcem and the hd44780-i2c driver from gorskima

How to use the driver

Gradle dependency

To use the driver-hd44780 driver, simply add the line below to your project's build.gradle, where <version> matches the last version of the driver available on jcenter.

dependencies {
    implementation 'com.leinardi.android.things:driver-hd44780:<version>'
}

Sample usage

import com.leinardi.android.things.driver.hd44780.Hd44780;

// Access the LCD:
Hd44780 mLcd;

try {
    mLcd = new Hd44780(BoardDefaults.getI2CPort(), Hd44780.I2cAddress.PCF8574AT, Hd44780.Geometry.LCD_20X4);
} catch (IOException e) {
    // couldn't configure the LCD...
}

// Draw on the screen:

try {
     mLcd.setBacklight(true);
     mLcd.cursorHome();
     mLcd.clearDisplay();
     mLcd.setText("Hello LCD");
     int[] heart = {0b00000, 0b01010, 0b11111, 0b11111, 0b11111, 0b01110, 0b00100, 0b00000};
     mLcd.createCustomChar(heart, 0);
     mLcd.setCursor(10, 0);
     mLcd.writeCustomChar(0);
} catch (IOException e) {
    // error setting LCD
}

// Close the LCD when finished:

try {
    mLcd.close();
} catch (IOException e) {
    // error closing LCD
}

License

Copyright 2018 Roberto Leinardi

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.