Initial sketch of the idea, sensors spread across entirety of head. I then thought to myself does there need to be that many sensors? How many are required for a sufficient force reading

Quick photoshop mock up of how it would look on a professional. This method of quickly rendering the concept helps me visualize the idea.

After the reverse-engineering of the Reebok checklight I found that the sensor requires only two components a giro-meter and an accelerometer. These two components as seen in the later stages of the video are small enough to fit into a conventional piece of medical tape. The sketches then further refined this idea.

Model Testing of the attachment issues with the idea, and its position on the head.

Holding the button down for a couple of seconds and the light flashing once to show its turned on. It would then flash intermittently if the force went over the required threshold, warning the ref that he needed to be checked. Including more detialed information being sent wirelessly to a physio

Different sized model, much smaller placed behind the ear. Further hidden from damage that would be taken during the game.