Ready to publish

LICENSE.txt

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+

README.md

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+# Chu Pico - Chunithm Style Mini Controller
+
+<img src="doc/main.jpg" width="80%">
+
+Features:
+* It's small, made for 15-16 inch screen.
+* Air towers are replaced with built-in ToF sensors.
+* HID lights, of course!
+* 32 keys (upper and lower rows).
+* Works with CrazyRedMachine's RedBoard.
+* All source files open.
+
+Thanks to many respectful guys/companies who made their tools or materials free or open source (KiCad, OnShape, InkScape, Raspberry things).
+
+And thanks to community developers that inspired me and helped me: CrazyRedMachine (https://github.com/CrazyRedMachine), SpeedyPotato (https://github.com/speedypotato).
+
+## Notes
+This one is relatively easy to build compared with my other projects like IIDX Pico or Teeny. You can check out my other cool projects.
+
+* Popn Pico: https://github.com/whowechina/popn_pico
+* IIDX Pico: https://github.com/whowechina/iidx_pico
+* IIDX Teeny: https://github.com/whowechina/iidx_teeny
+
+This Chu Pico project:  
+* Heavily depends on 3D printing, you need a Bambu 3D printer.
+* Requires skills to solder tiny components.
+
+## **Disclaimer** ##
+I made this project in my personal time with no financial benefit or sponsorship. There will continue to all components and firmware to improve the project. I have done my best to ensure that everything is accurate and functional, there's always a chance that mistakes may occur. I cannot be held responsible for any loss of your time or money that may result from using this open source project. Thank you for your understanding.
+
+## About the License
+It's CC-NC. So diy for yourself and for your friend, don't make money from it.
+
+## HOW TO BUILD
+### PCB
+* Go JLCPCB and make order with the gerber zip file (latest `Production\PCB\chu_main_xxx.zip`), regular FR-4 board, black color, thickness is **1.6mm**.  
+* 1x Rasberry Pico Pi Pico or Pico W.  
+  https://www.raspberrypi.com/products/raspberry-pi-pico
+  Becareful of 3 pins that are at the other side, they're difficult to solder and may leave air bubbles.  
+  <img src="doc/solder_usb_txrx.jpg" width="60%">
+
+* 1x USB Type-C socket (918-418K2023S40001 or KH-TYPE-C-16P)
+* 36x WS2812B-4020 side-facing RGB LEDs.  
+  https://www.lcsc.com/product-detail/Light-Emitting-Diodes-LED_Worldsemi-WS2812B-4020_C965557.html
+* TCA9548APWR (TSSOP-24) I2C multiplexer.  
+  https://www.lcsc.com/product-detail/Signal-Switches-Encoders-Decoders-Multiplexers_Texas-Instruments-TCA9548APWR_C130026.html
+* 3x MPR121 modules, there're many types in the market, choose ones like this, and remember to **cut (unshort) the ADDR pin** which is short by default:  
+  https://www.sparkfun.com/products/retired/9695
+* 5x Toshiba GP2Y0E03 ToF sensors, buy ones that equipped with cables.  
+  https://www.lcsc.com/product-detail/Angle-Linear-Position-Sensors_Sharp-Microelectronics-GP2Y0E03_C920270.html
+  <img src="doc/gp2y0e03_solder.jpg" width="90%">
+* 2x 0603 5.1kohm resistors (R1, R2) for USB.
+* 1x SN74LV1T34DBVR (SOT-23-5) level shifter (U8), if you can't find one, use a 0603 10ohm resistor (R3) as an alternative.  
+  https://www.lcsc.com/product-detail/Buffer-Driver-Transceiver_Texas-Instruments-SN74LV1T34DBVR_C100024.html
+
+  <img src="doc/pcb_1.png" width="90%">
+
+* 8x 0603 1uF capacitors (C1 to C8), OPTIONAL, recommended.
+* 10x 0603 10kohm resistors (R4 to R13) for I2C pull-up, OPTIONAL, normally not needed.
+
+### Light Guide Panel
+* Find a service to cut a light guide panel using DXF or DWG file `Production\CAD\chu_pico_lgp.*`, the size is 256mm*60mm, 1.5mm to 2.0mm thickness, thinner is better for sensitivity. 2.0mm is easy to find, 1.8mm is difficult, and 1.5mm is rare. I used 1.8mm for my build. 
+  <img src="doc/lgp_1.png" width="90%">
+* LGP material choices:
+  * Real LGP (Light Guide Panel) material, it's the best choice.  
+    <img src="doc/lgp_2.png" width="50%">
+  * Clear Acrylic with Light Guide Film, it's a good choice.  
+    <img src="doc/lgp_3.png" width="50%">
+  * Clear Acrylic with single-side-frosted, it's a good choice.  
+    <img src="doc/lgp_4.png" width="50%">
+  * Clear Acrylic with manual single-side-sanding, it can work too.  
+    <img src="doc/lgp_5.png" width="50%">
+
+### PP Touch Cover
+* A **textured** PP polypropylene film sheet, used as the light guide panel cover. It improves touch feel, 0.5mm thichness feels the best. If you can't find one, go get a project folder with textured cover.    
+  <img src="doc/pp_1.png" width="50%">  
+  <img src="doc/pp_2.png" width="80%">
+* Cut the PP sheet to roughly match the shape of the light guide panel, use double-sided tape (at the edge only) to stick it on the light guide panel.  
+  <img src="doc/pp_3.png" width="80%">
+
+###  IR Cover
+* It's for good looking, as it hides 5 ToF sensors. But it can't block the IR lights.
+* Find a service to cut an IR cover using the DXF or DWG file `Production\CAD\chu_pico_ir_cover.*`, the size is 293.2mm*63.5mm, 1mm thickness. The material must be "Infrared Transmitting Acrylic Sheet" which can block visible lights (it looks black) while letting IR lights go through.  
+  <img src="doc/ir_cover_1.png" width="80%">
+* If you can't find one, cut a regular smooth surface acrylic, but it can't hide the ToF sensors which are not good looking.
+
+### 3D Printing
+* You need a Bambu 3D printer for 2 reasons:
+  * Parts are designed to perfectly fit in its 256mm*256mm print bed.
+  * It's AMS system works great for easy-to-remove support material.
+* For all the following prints:
+  * To fit object in the bed, Z rotate: 315 degree, X, Y move to: 134mm  
+  <img src="doc/rotate.png" width="50%"><img src="doc/moveto.png" width="32%">  
+  <img src="doc/layout.png" width="85%">
+
+  * PLA, PETG, ABS are all OK.
+  * Layer height: 0.2mm
+  * 4-6 walls
+  * Z-Rotate 315 degree
+  * X, Y location: 134mm
+  * Support: Yes. If you have Bambu AMS system, use their special support material at interface layers.
+
+* Base: `Production\3D\chu_pico_base.stl`, dark gray filament.
+* Top Cover: `Production\3D\chu_pico_top_cover.stl`, dark gray filament.
+* Cover Base: `Production\3D\chu_pico_cover_base.stl`, **clear transparent (IMPORTANT)** filament.
+* Light Guide Panel Fixer: `Production\3D\chu_pico_lgp_fixer.stl`, color doesn't matter.
+
+### Exploded View for Assembly
+<img src="doc/assemble.png">
+
+From top to bottom:
+* IR Cover
+* Top Cover
+* Cover Base
+* PP Film
+* Light Guide Panel
+* PCB
+* Light Guide Panel Fixer
+* Base
+
+You need **4x M3*12mm screws and 4x M3 hex nuts** to fix all things.
+
+5x silicone anti-slip pads can be applied to the bottom side of the base.
+
+### Firmware
+* UF2 file is in `Production\Firmware` folder.
+* For the new build, hold the BOOTSEL button while connect the USB to a PC, there will be a disk named "RPI-RP2" showed up. Drag the UF2 firmware binary file into it. That's it. There's a small hole at the bottom side of the Chu Pico, it is facing right to the BOOTSEL button.
+* It works on CrazyRedMachine's RedBoard protocol. For more information, please check out CrazyRedMachine's project (Don't forget to give him a star and drop by his GitHub for other cool projects):  
+https://github.com/CrazyRedMachine/RedBoard
+
+## CAD Source File
+I'm using OnShape, it's free and powerful. But it can't export original designs to local, so I can only share the link here.
+https://cad.onshape.com/documents/8b9d0fe6ff1bfa4da17d33ee/w/5c7c980a282a19e7ba1db795/e/56ee65492584a3f709c23c49?renderMode=1&uiState=64fd606f17393c0e6f9b19a4

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