Dave Vanden Bout is president of Xess Corp., Apex, N.C. He holds a BS, MS, and PhD in electrical engineering. Also, he attended North Carolina State University, Raleigh, and the Massachusetts Institute of Technology, Cambridge. Email address: devb@xess.com
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March 12, 2009[Ideas For Design] Series Resistors, Body Capacitance Scan 16 Buttons With Two MCU Pins
In an application using a pin-limited microcontroller (MCU), I needed to scan an array of 16 buttons. The technique I used involved a series string of resistors of identical value connected between two bidirectional pins of the MCU. For simplicity, the example shown uses five resistors to scan four buttons (see the figure). A metal pad is created at each juncture between the resistors. When a person...
