phone-test-page.tsx

import { useEffect } from 'react';

const bpmToMillis = (bpm: number) => (bpm === 0 ? 0 : Math.round(60000.0 / bpm));

let vibrateInterval: number;

function startVibrate(duration: number) {
  navigator.vibrate([duration, duration]);
}

function stopVibrate() {
  if (vibrateInterval) {
    clearInterval(vibrateInterval);
  }
  navigator.vibrate(0);
}

function startPersistentVibrate(interval: number) {
  vibrateInterval = setInterval(() => {
    startVibrate(interval);
  }, interval * 2);
}

const millis = bpmToMillis(60);

export default function PhoneTestPage() {
  useEffect(() => {
    startPersistentVibrate(millis);
    return () => {
      stopVibrate();
    };
  }, []);
  return (
    <div>
      <h1>Touch Screen to Test Actuator</h1>
    </div>
  );
}