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+[[!meta title="Interactive Punching Bag"]]
+
+I worked as part of a group on building an interactive punching bag over a
+summer holiday.
+
+The bag is wrapped in an interactive layer: an 8 X 19 grid of surface- mounted
+impact sensors (membrane switches), interleaved with a 9 X 20 grid of
+tri-color, common-cathode LEDs driven by 8-digit LED drivers, and 2
+surface-mounted accelerometers, at the rear of the bag, one at the mid-point,
+one at the base.
+
+The LEDs are embedded in a foam layer, which also protects the wiring and
+solder joints. The sensor grid is controlled by one Arduino Mega 2560, which
+also receives input from the accelerometers, and the LED grid is controlled by
+another. The Arduinos are connected by USB to a wall-mounted PC with a touch-
+screen display. Speakers mounted on the bag are connected by audio cable to the
+PC.
+
+<video width="100%" controls>
+    <source src="punchingbag.mp4" type="video/mp4">
+Your browser does not support the video tag.
+</video>
+
+The [source code](http://git.cbaines.net/?p=punchingbag.git;a=summary) is available.
+
+## Development Photos
+
+[[!album
+    sort="path"
+]]