I chose to buy only PCB boards and source components from somewhere else because it is cheaper this way. Also I changed my mind about sound card. Sound card that I will use is Hifiberry. I was going to use audio input for microphone only and I can use usb microphone instead.
I have changed my mind about the layout of potentiometers also and I will add 16 drum pads and extra potentiometers or rotary encoders. I want pads to have aftertouch and velocity sensitivity. I will use force sensor for aftertouch and 2 mini buttons for velocity sensitivity. I will connect all this to Atmega 2560 through few 16-channel analog multiplexer/demultiplexer or maybe I must look into shift registers. I hope that there will not be problems. Atmega will be connected to Raspberry pi with usb. I must look into connecting Atmega to Raspberry pi through GPIO pins. Mechanism of drum pads will be 3d printed untill I can get them machined out of aluminium.
If anyone has better idea how to make drum pads with aftertouch and velocity sentivity please let me know.
I am not sure what wood I will use to construct the body. It needs to be durable as I will be carrying it around. I am thinking about using birch but I am not sure if it is good one to use. It is something that grows lot around here and I thought that it would be nice to use local material.
I live in Finland so if anyone knows any good scandinavian wood for synthetisator please let me know.
The way I will make the body is by chiseling big piece of wood hollow. So big that I can fit mutilated korg nanokey 2, electronics and battery inside it. I probaply cover the hole with plywood or thin wood strips glued together to make bigger piece. I might try aluminium to see how it looks. If it looks better I will keep it that way. I might even try anodizing it if it looks good. Maybe golden or slightly orange. I must choose the color of wood first. Color will be some of these or these colors with glossy finish.
I would like to make all the keys and drum pads out of wood. I hope I can dismantel Korg keyboard so that I can install my own keys made out of wood and maybe some 3d printed parts. I have to look how Korg keys are made. Maybe the keys will be painted with one of second links colors and pody one of first links colors. I might go crazy and buy that “Mandariini 3258” color for body. I already have orange 1.8mm leds for drum pads. These will be mounted inside hole middle of pads and I will cover the hole with some kind of clear glue or epoxy so that it will look nice. I have to try different options and find what is best one to use.
Here is picture of how I want it to look.
Square thing with lines going verticaly at right top corner is heatsink for Raspberry pi. It will be connected to raspberry pi with standoffs and raspberry pi will be connected to body with embedded nuts. On top left there is drum pads. In reality they will be 1,5 x 1,5cm squares 0,5cm apart from each other. Between and under them there will be potentiometers or rotatry encoders. I would like to use rotary encoders with rgb leds but there might be problems because I would have too many inputs and outputs for arduino. In middle ther is screen and rotary encoders around it and at bottom nanokey2.