add controls to docs 3d viewer

README.md

 It's made for three hand-wound solenoids mounted to a tambourine.
 It is controlled by a Raspberry Pi Pico on a custom PCB.
 
-See [this blog post for some more context](https://www.xythobuz.de/lars.html).
+Please take a look at [the auto-generated documentation](https://xythobuz.github.io/lars/).
+
+Also see [this blog post for some more context](https://www.xythobuz.de/lars.html).
 
 ## Quick Start
 
 
     make -Cbuild -j4
 
-Flash as usual using the mass storage bootloader (hold BOOTSEL while pluggin in the Pico).
+For the first time, flash as usual using the mass storage bootloader (hold BOOTSEL while pluggin in the Pico).
+After the firmware has been flashed once you can just use the included `flash.sh` to avoid having to hold the button.
+Use `debug.sh` to open a serial console via USB.
 
 ## Hardware Connections
 

docs/generate_docs.sh

     echo '    }' >> $1
     echo '</script>' >> $1
     echo "<p>Status: \"<span id=\"3d_info_$2\">Preparing 3D model...</span>\"</p>" >> $1
-    echo "<div id=\"3d_viewer_$2\" style=\"width: 100%; height: 100%; background-color: white; border: 1px solid black;\"></div>" >> $1
+    echo "<div id=\"3d_viewer_$2\" style=\"width: 100%; height: 100%; background-color: white; border: 1px solid black; position: relative;\"></div>" >> $1
     echo '<script type="module">' >> $1
     echo "    var info = document.getElementById(\"3d_info_$2\");" >> $1
     echo "    var view = document.getElementById(\"3d_viewer_$2\");" >> $1

docs/src/introduction.md

 # Introduction
 
-**TODO** work in progress
+![PCB](https://github.com/xythobuz/lars/actions/workflows/kicad.yml/badge.svg)
+![Docs](https://github.com/xythobuz/lars/actions/workflows/docs.yml/badge.svg)
+![STLs](https://github.com/xythobuz/lars/actions/workflows/scad.yml/badge.svg)
+
+This is a simple drum machine / loopstation.
+It's made for three hand-wound solenoids mounted to a tambourine.
+It is controlled by a Raspberry Pi Pico on a custom PCB.
 
+See [this blog post for some more context](https://www.xythobuz.de/lars.html).
 
+**TODO** work in progress

docs/src/js/3d.js

 import { VRMLLoader } from 'three/addons/loaders/VRMLLoader.js';
 
 // https://wejn.org/2020/12/cracking-the-threejs-object-fitting-nut/
-function fitCameraToCenteredObject(camera, object, offset, orbitControls ) {
+function fitCameraToCenteredObject(camera, object, offset, orbitControls, yOffset) {
     const boundingBox = new THREE.Box3();
     boundingBox.setFromObject( object );
 
     // offset the camera, if desired (to avoid filling the whole canvas)
     if( offset !== undefined && offset !== 0 ) cameraZ *= offset;
 
-    camera.position.set( 0, 0, cameraZ );
+    camera.position.set( 0, yOffset * cameraZ, cameraZ );
 
     // set the far plane of the camera so that it easily encompasses the whole object
     const minZ = boundingBox.min.z;
     const scene = new THREE.Scene();
     scene.add(new THREE.AxesHelper(1));
 
-    const camera = new THREE.PerspectiveCamera( 75, width / height, 0.1, 1000 );
+    const camera = new THREE.PerspectiveCamera(75, width / height, 0.1, 1000);
 
     const renderer = new THREE.WebGLRenderer();
-    renderer.setSize( width, height );
+    renderer.setSize(width, height);
 
-    container.appendChild( renderer.domElement );
-
-    const controls = new OrbitControls( camera, renderer.domElement );
+    const controls = new OrbitControls(camera, renderer.domElement);
     controls.enableDamping = true;
+    controls.autoRotate = true;
 
     if (path.endsWith(".stl")) {
         const light_amb = new THREE.AmbientLight(0x424242);
             function (geometry) {
                 const mesh = new THREE.Mesh(geometry, material);
                 scene.add(mesh);
-                fitCameraToCenteredObject(camera, scene, 0, controls);
+                fitCameraToCenteredObject(camera, scene, 0, controls, 0);
             },
             (xhr) => {
                 const s = (xhr.loaded / xhr.total) * 100 + '% loaded';
             path,
             function (object) {
                 scene.add(object);
-                fitCameraToCenteredObject(camera, scene, 0, controls);
+                fitCameraToCenteredObject(camera, scene, 0, controls, 0);
             },
             (xhr) => {
                 const s = (xhr.loaded / xhr.total) * 100 + '% loaded';
     }
 
     camera.position.z = 50;
-
-    function render() {
-        renderer.render(scene, camera);
-    }
+    controls.update();
 
     function animate() {
         requestAnimationFrame(animate);
         controls.update();
-        render();
+        renderer.render(scene, camera);
     }
 
     animate();
     status.textContent = "3D model ready!";
+
+    container.appendChild(renderer.domElement);
+
+    const div = document.createElement("div");
+    div.style.position = "absolute";
+    div.style.left = "5px";
+    div.style.top = "5px";
+    div.style.background = "white";
+    div.style.color = "black";
+    container.appendChild(div);
+
+    const chk_ar = document.createElement("input");
+    chk_ar.type = "checkbox";
+    chk_ar.checked = true;
+    chk_ar.addEventListener('change', function() {
+        controls.autoRotate = this.checked;
+    });
+
+    const div_ar = document.createElement("div");
+    div_ar.appendChild(chk_ar);
+    div_ar.appendChild(document.createTextNode("Auto-Rotate"));
+    div.appendChild(div_ar);
+
+    const btn_rst = document.createElement("input");
+    btn_rst.type = "button";
+    btn_rst.value = "Reset Camera";
+    btn_rst.addEventListener('click', function() {
+        fitCameraToCenteredObject(camera, scene, 0, controls, 0);
+    });
+
+    const div_rst = document.createElement("div");
+    div_rst.appendChild(btn_rst);
+    div.appendChild(div_rst);
 }

pcb/fp-lib-table

 (fp_lib_table
   (version 7)
   (lib (name "chinese_modules")(type "KiCad")(uri "${KIPRJMOD}/chinese_modules.pretty")(options "")(descr ""))
+)