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DIY art stand for small engraved artworks based on a custom pcb with several RGB effects.
This design is based on a custom printed circuit board made with KiCad for which all the project files are found in this repository.
The file design-files/prism-fx_v1_1_gerber.zip can be uploaded directly to most manufacturers' websites to order your own. You will find the list of all required components for hand soldering in ./design-files/pcb-components-list.csv.
The base is laser cut using wood and acrylic (with the intermediate part alternatively 3D printed in translucent material) and held together with four 16mm M2.5 screws.
I also designed a simple cap for the knob which you can 3D print.
Everything was designed using FreeCAD in the project file model.FCStd.
You will also find .stl and .dxf files in the design-files/ to use straightaway.
Note that some metrics may need to be slightly adjusted depending on the laser cutter or 3D printer.
Pretty much anything can be used with the RGB base, but I personnally decided to engrave AI-generated images on wood with an etched layer of acryllic on top to capture light and highlight the edges of the pictures. I'm not sharing the arts here, as the point to me is that they are unique and personnal. Be creative!
The ATtiny85 microcontroller can be easily programmed using an Arduino board as a programmer and with the help of the Arduino IDE. Many tutorials are available online. Please note that the USB-C port is only used for powering the circuit board, thus it is possible to program the microcontroller throught it. Use the PCB's 6 header pins instead. In order to work with the default sketch, connect them to the Arduino GPIOs as shown below:
ArduinoISP The 6 pins
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+ - 10 13 12 11 <- Arduino GPIOs
You will find an example sketch in prism_fx/prism_fx.ino.
The sketch shows a way of using interrupts to react to knobs events, the Adafruit_NeoPixel library to control the RGB Neopixels, and to storing the last effect state in the permanent EEPROM storage.
Feel free to customize it with you own effects.
In the example sketch, the device cycles through the 3 following modes by pressing down the knob:
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