- The PS of the DAC (7.5V -mistakenly labeled 6.5V) provides the power to the Microcontroler. The Local regulator of Arduino provides 5V to the microcontroller and the LCD.
- Two I2C (2-cable) connections: one to the LCD and one to the DAC.
- NOTE: I've made changes to the pull-up resistors for the I2C lines because the OPUS is a 3.3V device. See this post.
- One button switch that when pressed provides 5V to pin 2 of Arduino. Pressing this switch changes the Digital filter.
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