EdgeWrite on Four Capacitive Sensors

Four-sensor EdgeWrite demonstrates that four capacitive sensors of any metallic shape or size can provide for full EdgeWrite text entry. The PIC processor deciphers finger touches on the four triangular pads and sends those touches over a USB cable to the PC. The PC-side C# program receives the corner touches over serial and submitts them to EdgeWrite. See my schematic for this design.

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Language: C#, PIC C
Requirements: Four capacitive sensors, Pololu USB-to-serial adapter, .NET 2.0 Framework (or later).

Download version 3.0.3
Can be augmented with word-level stroking.