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by dynamis

HTML

<script src="https://aky.sh/gc-vr/polyfill/polyfill-mod.js"></script>
<p>Hello Remote CHIRIMEN</p>
<!-- see:
https://github.com/chirimen-oh/chirimen-raspi3/wiki/Remote-CHIRIMEN
https://qiita.com/tadfmac/items/82817476615fdc7394b3 -->

JavaScript

(() => {
  'use strict'

	navigator.setPolyfillServerURL('ws://192.168.2.14/')

  navigator.requestGPIOAccess().then(gpioAccess=>{
    var port = gpioAccess.ports.get(26);
    var v = 0;
    return port.export("out").then(()=>{
      setInterval(function(){
        v ^= 1;
        port.write(v);
      },1000);
    });
  });
})()