nwmedia-c262-lab2-key.js

import SerialPort from 'serialport';
import readline from 'readline';

(async () => {
  const entries = await SerialPort.list();
  const entry = entries.find(
    (it) => it.manufacturer && it.manufacturer.includes('Arduino')
  );
  if (!entry) {
    console.warn('No Arduino found');
    return;
  }
  console.info(`Connecting to ${entry.path}...`);

  const port = new SerialPort(entry.path, { baudRate: 9600 });
  const parser = port.pipe(
    new SerialPort.parsers.Readline({ delimiter: '\r\n', encoding: 'ascii' })
  );

  await new Promise((resolve, _) => {
    const listener = () => {
      resolve(undefined);
      parser.removeListener('data', listener);
    };
    parser.addListener('data', listener);
  });

  console.info('Device is now ready for serial communication');

  const rgb = [0, 0, 0];
  readline.emitKeypressEvents(process.stdin);
  process.stdin.setRawMode(true);
  process.stdin.on('keypress', (c, key) => {
    if (key.sequence === '\u0003') {
      process.exit();
    }
    switch (c) {
      case 'r':
        rgb[0] = (rgb[0] + 20) % 256;
        break;
      case 'g':
        rgb[1] = (rgb[1] + 20) % 256;
        break;
      case 'b':
        rgb[2] = (rgb[2] + 20) % 256;
        break;
    }
    port.write(Buffer.from(Uint8ClampedArray.of(...rgb, 0x0a)));
  });
})();