ES9018 I2C controller

[Corpius]

Yes that should be possible for sure. I thought of using jst connectors, but I wanted to use angled type. I did not had these around so that's why Ichoose to use only pin headers. Most other connecters would do equally well.

[gwikse]

Well I have a bunch of connector types lying around. Will most likely use angled headers as well. As many cable assemblies will fit them. I am a little unsure of what connectors I will use for the i2c assembly though. Would be nice to have them angled and low profile as well. The oled is a lot less thick than a normal lcd solution so I hope that I can make it very slimline. Idealy the phoenix terminal would be the highest part on the piggyback and the display would be mounted with 5-6mm spacers. The "display box" only rise about 4mm above the PCB on the oled, so this should be very small and tidy solution

[Crumboo]

Originally Posted by Corpius

1. The Adum I2C isolator is indeed a very useful component. I will add this to the list.

What chip are you using? Where are you buying it from?

Best regards,

Mattias

[Corpius]

Originally Posted by Crumboo

What chip are you using? Where are you buying it from?

Best regards,

Mattias

Hi Mattias,

It is the Adum1250. I bought it from Farnell. Digikey also sells it.
You asked a week ago if the controller can also be used for multi channel operation. That's possible when you set the quantizer setting to 6-bit for each input. Besides that you need to set the jumpers underneath the DAC board according to page 22 of Leon's Intergration guide.

I did a revision of my original design. The first one contained a small mistake, the (supposed to be) isolated gnd of the I2C isolator connects to the boards ground plane. This is corrected. Besides that I added the pcf8574at for driving an LCD. My first design needs to be used with the LCD ExtraIO from electroFUN, but the new one allows any hd44780 based LCD, OLED or VFD to connect directly to the controller. Also added a 3.3v LDO voltage regulator to have 3.3v outputs as well. I hope that these PCBs arrive a lot faster than my last order. That took almost a month!

[SCompRacer]

Nice work on the boards Corpius. If I build another DAC with I2C I know where to shop.

[Corpius]

Finally I have finished my controller!
The first prototype contained a small mistake where the ADuM1250 was not really isolating. While I was correcting this I added the PCF8574AT port expander and a 3.3v low drop voltage regulator to the controller. This port expander is used to drive the LCD, OLED or VFD, thus saving seven I/O's from the microcontroller that now can be used for any other application. The 3.3v regulator adds a 3.3v breakout to the controller.

I wrote an article about my controller where most features get highlighted. It's published to my website.

[themystical]

That looks fantastic Robert!

[Corpius]

The firmware for my controller is available now and is accompanied by a simple manual. It took me a very long time to get it ready. Very little time and many requests to include all kind of different features made me think that it would never be released.
I was only able to test it with my Buffalo III in stereo configuration, 4 spdif inputs, sidecar, OTTO II, so no hard guaranties that it is completely free of errors.

While I was at it I did also release a version that can be used with the Arduino Uno in combination with my shield. It has some of the same functions as the other firmware.

Both can be downloaded here: Downloads

[mvaldes]

That's a very good job!
Have you also included the possibility to control more than one Buffalo?
I have an active multiway system and I'm using an Arduino with GLT firmware to control two BII
I would like to switch to your system but would like to be sure if your firmware can handle two Buffalo

[SCompRacer]

Highest marks Robert! Top notch design, well layed out site, excellent instructions.