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Input panelThe input panel of the HACKaos is a 12 by 12 matrix of contacts, each connected to its horizontal neighbour via resistors. When these contacts get touched by a pen connected to the power supply, the resistors form a voltage divider and the Arduino can calculate, which contact was pressed using the built-in ADCs.
The spreadsheet used to calculate the ideal values for the resistors (and by ideal we mean that the resulting voltages are evenly distributed within the input range of the ADC) can be found in the attachments.
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Page last modified on Friday 20 of August, 2010 16:57:39 CEST by .
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Gambit - Password Hashing Challenger - Pintér Krisztián