docs: added raspberry pi driver information to test-posture-tracker n…

…otebook

notebooks/test-posture-tracker.ipynb

@@ -10,6 +10,45 @@
     "%autoreload 2"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**STEP FOR PI:**\n",
+    "To ensure opencv can detect the pi camera, activate the following driver which comes included with\n",
+    "the raspberry Pi OS.\n",
+    "\n",
+    "REF:\n",
+    "\n",
+    "- https://stackoverflow.com/questions/27950013/i-am-trying-make-the-raspberry-pi-camera-work-with-opencv\n",
+    "- https://github.com/thenaran/linux-rpi/blob/master/Documentation/video4linux/bcm2835-v4l2.txt\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "!sudo modprobe bcm2835-v4l2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Then to check driver is activated.\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "!ls -ltrh /dev/video*"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 2,