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Arduino for Buffalo II DAC
I’ve started writing the code for Arduino for the Buffalo II DAC. I am reusing the code I wrote for the Wolfson 8741 (TPA OPUS DAC), but I’ve decided to make some changes to make it easier for others to implement.
Hardware components:
- Arduino UNO (Although any Arduino clone will work)
- “Standard” Hitachi-HD44780-compatible LCD (20×4). This device has native support from the Arduino standard installation. In my previous code, I used a serial LCD implementation from a single supplier with custom libraries. The “standard” LCD is available everywhere. I got mine from SureElectronics on ebay
- “El cheapo” rotary encoder, debounced with capacitors. More info here and here
- 5V to 3.3V level converter for the I2C lines. Even though it has been reported that the Saber DAC is 5V tolerant at the inputs of the I2C, I’m using the level converter just in case. More info here.
The initial release consists of basic volume control with a rotary encoder and display of volume level from -99db to 0db.
The code is available here: Arduino code for Buffalo II DAC. Copy the text and paste it into an Arduino blank sketch; verify the code and upload it into the Arduino board. There are many good tutorials on how to get started with Arduino. Here is one: http://www.ladyada.net/learn/arduino/
H i F i D U I N O 
Many, MANY thanks for posting this code. Having read your blog in the past, I got an Arduino Uno a couple weeks ago with the intent of interfacing with my Buffalo 32s. I’ve also requested information from ESS on getting the data sheet (signing the NDA, etc.). I’m intrigued since you mention that your are under NDA, but have received permission for sharing the code. I’m trying to figure out right now how to read the sample rate using the DPLL_NUM. Are you able to share that code by chance? Regardless, great work my friend.
Thanks and keep up the GREAT work for the community.
DoubleAA,
This is all the code I’ve written so far. I wanted to put out a basic sketch for people to learn and experiment. I plan on adding more features as time permits. I can work on reading the sample rate next.
Sounds great! It’s your sample code / experiences that has driven me to get the Arduino and now, subsequently do more than just display sample rate 😉 I now have added a headphone out which of course means I need the volume control and….again thanks!
What shield is that sitting on top of the arduino?
I purchased from nkcelectronics. I don’t see it anymore in their new website. It was some sort of prototyping shield similar to this: http://www.nkcelectronics.com/freeduino-arduino-protoshield-pcb.html
That’s too bad, looks like you were able to hook alot of stuff up to that shield. Is that the logic level converter I see and did it come with that harness for the LCD?
The shield came with nothing, just the solder holes/pads and the pins to connect to Arduino. Everything else, including extra holes for other components I added myself. The little red board is the logic level converter. Here is a better picture of the shield in another project: http://hifiduino.blogspot.com/2009/04/modding-shield.html
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