Ultrasonic Distance Sensor

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/3544048/widgets/1319543"></iframe>

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/3544048/charts/1?bgcolor=%23ffffff&color=%23d62020&dynamic=true&results=60&title=Distance+Sensor&type=spline&yaxis=CM"></iframe>