add rotation sensor

apps/bthome_rotate/ChangeLog

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+0.01: New App!

apps/bthome_rotate/README.md

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+# BTHome Rotation
+
+This advertises temperature, battery and rotation in a [BTHome (https://bthome.io/)](https://bthome.io/) compatible format, which can then be used in https://www.home-assistant.io/
+
+There are two rotations advertised, for the X and Y axes. When the Puck.js is completely flat on a desk (aerial up, button down) a value of `0,0` will be reported, and will vary +/- 180 degrees. Rotation updates once per minute.
+
+This is based on https://www.espruino.com/BTHome
+
+
+## Usage
+
+Install the app and disconnect, then Puck.js will appear in Home Assistant as a new device

apps/bthome_rotate/app.js

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+var a,rx,ry;
+
+// https://www.espruino.com/BTHome
+// Update the data we're advertising here
+function updateAdvertising() {
+  // read accelerometer
+  a = Puck.accel().acc;
+  // calculate angle
+  rx = Math.atan2(a.x,a.z)*180/Math.PI;
+  ry = Math.atan2(a.y,a.z)*180/Math.PI;
+
+   NRF.setAdvertising(require("BTHome").getAdvertisement([
+    {
+      type : "battery",
+      v : E.getBattery()
+    },
+    {
+      type : "temperature",
+      v : E.getTemperature()
+    },
+    {
+      type : "rotation",
+      v : rx
+    },
+    {
+      type : "rotation",
+      v : ry
+    },
+  ]), {
+    name : "Rot", interval:1000,
+    // not being connectable/scannable saves power (but you'll need to reboot to connect again with the IDE!)
+    //connectable : false, scannable : false,
+  });
+}
+
+NRF.setTxPower(4);
+updateAdvertising();
+setInterval(updateAdvertising, 60000); // 1 minute

apps/bthome_rotate/metadata.json

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+{
+  "id": "bthome_rotate",
+  "name": "BTHome Rotation Sensor",
+  "icon": "icon.png",
+  "version": "0.01",
+  "description": "Turn your Puck.js into a BTHome/Home Assistant compatible angle/rotation sensor",
+  "tags": "bluetooth,homeassistant,angle,rotation",
+  "readme": "README.md",
+  "needsFeatures": [
+    "BLE",
+    "ACCEL"
+  ],
+  "storage": [
+    {
+      "name": ".bootcde",
+      "url": "app.js"
+    }
+  ]
+}