Required Background Knowledge:
With the explosion of mobile devices, tablet styli have become commonplace. They’re available online, from specialty supply stores, big box chains and even convenience stores. Some of the cheapest ones are surprisingly accurate and some of the most expensive ones leave something to be desired. The user is ultimately taking a leap of faith that the device they choose will be comfortable and will function as advertised.
A typical stylus makes use of two key concepts - conductive material and a circuit. In order for the device to work, a couple of factors need to be in place. First, the tip needs to be conductive. On most devices, this means a rubber tip - although a range of other materials can be used - even a slightly damp piece of sponge. Next, something needs to connect to the tip. This can be a wire, conductive paint, or thin strips of copper tape. This is because most people don’t hold their stylus by the tip! In essence, the circuit needs an extension cord, and the extension cord is the conductive material you use to lengthen the circuit. Finally, you need to touch the conductive material that lengthens the circuit. This might mean simply contacting the wire or tape when you grip the pen. In more complex designs, these components are hidden or are even aesthetic components of innovative designs. |
The humble stylus isn’t perfect, but it’s come a long way. In order for these devices to become truly integrated in our mobile society, a couple of things need some tweaking - precision, position and pressure and latency. All three of these factors are things that students should take into account with this design challenge, and surprisingly, some small tweaks can reap big rewards.
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