상황
A digital volume control system uses a PT2258 6-channel electronic volume controller, an ATmega328P microcontroller for I2C control, and a rotary encoder for user input.
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01
Use I2C interface between ATmega328P and PT2258 for digital volume adjustment
02
Model the rotary encoder as two SPST switches with pull-down resistors for quadrature A/B outputs
03
Include a 5V regulator and bypass capacitors for stable logic supply
Use this pattern for digital audio volume control, preamplifier stages, or any microcontroller-managed analog signal path with I2C peripherals.