距離センサを読み取る

obniz Parts Library - HC-SR04

超音波を利用した距離センサーをGoogle siteで動かします。

Gnd  → 0
Echo → 1
Trig → 2
Vcc  → 3

obniz距離センサ測定<br />
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://unpkg.com/obniz@3.x/obniz.js" crossorigin="anonymous" ></script>
obniz ID:<input type="text" id="oid" style="width: 100px;"><br />
<button onClick="init();">実行</button><br />
<span id="val" style="display: inline-block; border: 1px solid blue; width: 70px; height: 25px; text-align: right;"></span>mm
<script>
var obniz;
function init() {
  obniz = new Obniz($("#oid").val());
  obniz.onconnect = async function () {

    const hcsr04 = obniz.wired("HC-SR04", {gnd:0, echo:1, trigger:2, vcc:3});

    while(true) {

      let avg = 0;

      let count = 0;

      for (let i=0; i<3; i++) { // measure three time. and calculate average

        const val = await hcsr04.measureWait();

        if (val) {

          count++;

          avg += val;

        }

      }

      if (count > 1) {

        avg /= count;

      }

      $("#val").html(Math.floor(avg));

      await obniz.wait(100);

    }

  };

}

</script>

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