2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers51.8 × 73.5 mm
ReachBetween rounded
qubist/ReachBetween5Simple, cheap, hackable, DIY, open-source USB-C input switcher
- Size
- 51.8 × 73.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 24
- Pads
- 96
- Tracks, vias
- 133, 17
- Pours
- 44
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 31 Mar 2022
- Updated
- 6 May 2022
Overview
ReachBetween rounded is an open-source printed circuit board by qubist, from the qubist/ReachBetween repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 51.8 × 73.5 mm with 11 parts on 24 nets, routed with 133 tracks and 17 vias.
It is built around the MRA403. Its parts include 3 connectors, 1 resistor, 1 diode and 1 switch.
Main components
1README
README.mdRB02
Simple, cheap, hackable, DIY, open-source USB-C input switcher
Background
I couldn't find a good USB-C switch with two outputs that wasn't hundreds of dollars, so I built my own. (Also I wanted an excuse to learn PCB design, and I was able to secure a few free sample rotary switches from an electronics company.) The result is the RB02, a two-output one-input bidirectional USB-C input switcher smaller than a credit card.
The RB02 has three USB-C ports, one on the front and two on the back. A knob on top has three positions, left, right, and center. In the left or right position, the device connects the USB port on the front to the left or right USB port on the back.
It's resonable to make as a weekend project as long as you've got a fine soldering iron for the few surface-mount pads.
Gallery
FIXME
Bill of Materials
| Item | Manufacturer | Part number | Quantity | Unit price | Total price |
|---|---|---|---|---|---|
| Rotary switch | NKK Switches | MRA-403-A | 1 | $24.17 | $24.17 |
| 18-8 Stainless Steel Socket Head Screw, M2 x 25mm | McMaster Carr | 91292A032 | 4 | $6.21 (pack of 10) | |
| 18-8 Stainless Steel Hex Nut, M2 | McMaster Carr | 91828A111 | 4 | $6.14 (pack of 100) | |
| 1/4" Adhesive-Back Bumper | McMaster Carr | 8215K219 | 3 | $2.06 | $6.18 |
| Custom Printed Circuit Board | Aisler | 1 | $7.04 | $21.10 (minimum order 3) | |
| Standard LED | 1 | ||||
| Standard resistor | 1 | ||||
| USB-C receptacle | JAE | DX07S016JA1R1500 | 3 | $1.67 | $5.01 |
| ~$70 |
Assembly
PCB assembly
FIXME
- Different resistor values result in different brightnesses of the LED. 420Ω is around full brightness. I like mine pretty dim so I chose FIXMEΩ
- To disable the LED entirely just remove the resistor. Or don't install the LED at all. One could easily redesign the case to remove the LED hole.
Case assembly
FIXME
- Clip off leads sticking through PCB to 2mm or less
- MR-A403 should be installed in this configuration from top to bottom:
- Knob
- Hex Face Nut
- Case
- Locking Ring (with nub pointing up into hole in case)
- Factory Assembled switch Refer to page 4 of the [datasheet](for definitions and details).
License
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 5.1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | IN | Library:USB_C_Receptacle_JAE_DX07S016JA1R1500_AislerCompatible | J1 |
| 1 | LED | LED_THT:LED_D5.0mm_Clear | D1 |
| 1 | MRA403 | Library:Rotary_Switch_NKK_MRA403-BB_2-3 | S1 |
| 1 | Out A | Library:USB_C_Receptacle_JAE_DX07S016JA1R1500_AislerCompatible | J2 |
| 1 | Out B | Library:USB_C_Receptacle_JAE_DX07S016JA1R1500_AislerCompatible | J3 |
The 6 most common of 11 parts.
Questions
How big is the ReachBetween rounded PCB?
It measures 51.8 × 73.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ReachBetween rounded use?
11 parts, built around the MRA403. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the ReachBetween rounded KiCad files?
From the qubist/ReachBetween repository on GitHub, at the commit this page was made from: the board is pcb/ReachBetween-rounded.kicad_pcb and its schematic pcb/ReachBetween.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ReachBetween rounded design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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