Initial sim implementation

sim/state/ultrasonic.ts

@@ -0,0 +1,31 @@
+/// <reference path="./sensor.ts"/>
+
+namespace pxsim {
+    export class UltrasonicSensorNode extends UartSensorNode {
+        id = NodeType.UltrasonicSensor;
+
+        private distance: number = 50;
+
+        constructor(port: number) {
+            super(port);
+        }
+
+        getDeviceType() {
+            return DAL.DEVICE_TYPE_ULTRASONIC;
+        }
+
+        setDistance(distance: number) {
+            if (this.distance != distance) {
+                this.distance = distance;
+                this.changed = true;
+                this.valueChanged = true;
+
+                runtime.queueDisplayUpdate();
+            }
+        }
+
+        getValue() {
+            return this.distance;
+        }
+    }
+}