IMPLEMENTED SO FAR
- Support for 4x20 LCD Display and large number display
- Brightness and contrast adjustment with remote
- (OPUS/Wolfson WM8741) DAC volume control: remote and rotary encoder
- (OPUS/Wolfson WM8741) DAC random filter selection 1 to 5 with remote
- (OPUS/Wolfson WM8741) DAC upsampling selection (L, M, H -this is the OSR setting)
- I2C level shifting (5V to 3.3V)
- Optimized power-up sequence
Completed and Tested
The "shield" handles the external 8V power and routes it to the Vin pin to feed the Freeduino. The small green PC board is the 3.3V level shifter for I2C. The pins in the back are 3 sets of power pins (5V). The diode/resistor is for the 8V line. The blue capacitor is for the 3.3V supply for the 3.3V levels in the level shifter. The small blue cap is for noise bypass for the 8V line.
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