WebUSB / Headphone connection to Espruino

@Gordon I'm getting fairly reliable readings now.

I guess my next question is how do I generate sounds of varying length. Out of my depth here I think.

I thought that this would generate 0.5seconds of...something, and then 0.5 seconds of silence, but I just get a click

AudioContext = window.AudioContext || window.webkitAudioContext;
audioContext = new AudioContext();

gainNode = audioContext.createGain();
gainNode.gain.value = 1;

var buffer = audioContext.createBuffer(1, 44100, 44100);
var b = buffer.getChannelData(0);

for (var i = 0; i < 22050; i++) {
  b[i] = 1.0;
}

for (var i = 22050; i < 44100; i++) {
  b[i] = -1.0;
}

source = audioContext.createBufferSource();
source.buffer = buffer;
source.connect(gainNode);
source.start();

gainNode.connect(audioContext.destinatio­n);