Zynthian w/ 5in screen & encoders on mcp23017

[beckdac]

Finished my build. Features:

• 5" touch screen (generic version of Waveshare 5" w/ SPI over GPIO touch interface)
• All four primary encoders are on a single MCP23017 using I2C w/ two interrupt pins. Details available here and here.
• Uses this DAC: https://www.sainsmart.com/sainsmart-hifi-dac-audio-sound-card-module-i2s-interface-for-raspberry-pi-2-b.html

Most of the documentation exists here:

beckdac/zynthian-build

Demo here, and before you play it, I chose the absolute worst instrument for the ‘Take 5’ demo, sorry:

Zynthian custom w/ 5 in touch and encoders all on 1 MCP23017

Assembly photos for the curious:

• Lid inside, I used an old 40 pin cable and made a gender changer for the display touch SPI
  
  
• Lid outside with ribbon HDMI cable
  
  
• Case inside with RPi3, Sainsmart DAC + MCP23017 board
  
  
• Fully assembled
  
  

[jofemodo]

Nice mounting, @beckdac! Congratulations!!

Is it working OK? What about the sound?
Probably you want to increase the font size in UI. You can do it from the webconf tool

Regards!

[beckdac]

Works great. Encoder demo here:

Sounds is great too.

I don’t actually own a midi keyboard and I’ve been experimenting with my own teensy, atmega32u4, and joy2midi controllers for generating midi signals. Preview of one of the prototype controllers using a teensy 3.2 and a couple of mcp23017 (not shown is the sd card and oled display):

I’m cruising eBay for a relatively inexpensive midi keyboard too but haven’t managed to win anything.