In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Bean;

If you wanted to sense 5 buttons to a common without any IC's, could you not simply wire 5 binary weighted resistors, one to each button, and then input that resistance into a single pin virtual ADC? A resolution of 2^5, or one in 32 should be quite achievable.

That would only use 5 button encoding resistors, one small cap and one more "DAC" resistor. All done with only one pinI/O pin!

Cheers,

Peter (pjv)

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