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Choice of cable

A project log for SonarPen - earphone >> smart pen

From discovery to commercial product. Turning an earphone phone into the most affordable smart stylus.

eltonElton 08/04/2017 at 07:590 Comments

Cable plays a major role in my smart stylus project. At the very beginning, thin woven cable was the preferred choice as it gives the product a cozy feeling. But when I tested it against the demo app on an iPad, the pressure reading was very unstable. The issue got worst when I am moving the pen in the air. It took me days to realize it was the cross talk from the 4 Enameled wires. Woven cable leave NO space between the wires. When the wires rubbing each other or bend in different angles, the resistant of the cable changes = jumping pressure readings. 

At the end, the thin flat "noodle" like silicon cable is the choice because its wires are separated = good stability. 

Some of the cables that we have used in prototypes. Round, thin, woven, color, thick and flat ones. 

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