I've had some luck programming the UNO to display a voltage on an LCD Screen (2x16). Yay me. The next step I need is to get an audio file to play that has the volume adjusted based on the voltage being read by the analog input. I have the Ethernet shield already, and some code that works for playing it.
I saw on the sample coding and the circuit for the Simple Audio amplifier, but that was for the DUO (circuit in the first attachment). Would I be able to hook that up to the UNO or do I really need to have the DAC input to have it work correctly?
The Due has two integrated DAC outputs. you'll have to add external DACs to the Uno. The rest depends on your signal source, whether it's an external AC signal, or should be generated by the controller.
I was able to get a similar circuit put together
Image didn't load right, I attached it.
However I did not use the 10 ohm resistor on pin 5, the 100uF cap on the positive rail, and instead of the 220uF on the speaker I used a 100uF.
I think they are all ceramic capacitors, I'm not sure, just threw it together with parts I have laying around.
All of this is added to the following circuit.
Link to the article here Linky
The problem I'm now having is two-fold (I think)
First, I'm getting a lot of static when I adjust the potentiometer on the first circuit, I thought there would be a volume change while the audio plays, instead it only creates static when the music is off. Is this because I'm not using all the parts yet that the circuit list?
Second, with the compressed WAV file I'm using I know the audio quality will be poor, what other options might there be to improve the quality?
