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You have created a 4 bit D to A using four pins of your micro-controller and an R/2R ladder, the output of this:
will give 8 output voltages and require 16 resistors to create the R/2R ladder
will give 4 output voltages and require 8 resistors to create the R/2R ladder
will give 16 output voltages and require 8 resistors to create the R/2R ladder
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