char-display

Character display driver for Android Things

HD44870 type displays (via LCM1602). Check out a full explanation here.

Usage

1. Create an Android Things project as described here
2. Add the following to your project's build.gradle

dependencies {
    implementation 'nz.geek.android.things:things-driver-char-display:<version>'
}

3. create the lcd object using an I2cLcdCharacterDisplay.builder() passing module width and height
4. use the builder to setup the pin mapping between PCF8574 pins and LCD pins
5. call lcd.connect() to open and initialise the display
6. write something to the display

private CharacterDisplay lcd;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  // create a display builder with the LCD module width and height
  I2cLcdCharacterDisplay.Builder builder = I2cLcdCharacterDisplay.builder(20, 4);

  // set port pin to LCD pin mapping, and PCF8574(A) address
  builder.rs(0).rw(1).e(2).bl(3).data(4, 5, 6, 7).address(6);

  // build and use the display
  CharacterDisplay lcd = builder.build();
  lcd.connect();

  // write message to the display, the first argument
  // is the LCD line (row) number
  lcd.print(1, "Hello World!");
}

@Override
public void onDestroy() {
  super.onDestroy();

  // disconnect from the display to free resources
  lcd.disconnect();
}

License

Copyright 2018 Dave McKelvie.

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.