4 layers213.7 × 140.6 mm
MSCKee
Creative-Difficulty/mSCKee
Split Keyboard for Hack Club Outpost with dual light sensors, per-key addressable backlighting, integrated RP2040 MCU
205 parts1
2 layers87.1 × 78.7 mm
SoftKeyboardController
Setting-Dawn/PlatformSoftKeyboardControlThis README is also used as the main page for the Doxygen-generated documentation. The remainder of this file contains project details, diagrams, and usage information. # PlatformSoftKeyboardControl
- Size
- 87.1 × 78.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 52
- Nets
- 96
- Pads
- 279
- Tracks, vias
- 815, 86
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Sep 2025
- Updated
- 11 Dec 2025
Overview
SoftKeyboardController is an open-source printed circuit board by Setting-Dawn, from the Setting-Dawn/PlatformSoftKeyboardControl repository on GitHub, published under the MIT licence. It is a 2-layer board of 87.1 × 78.7 mm with 52 parts on 96 nets, routed with 815 tracks and 86 vias.
It is built around the DRV8848PWP, PCA9956BTWY and CD74HC4067SM96. Its parts include 14 resistors, 10 connectors, 6 capacitors and 6 ICs. It belongs with the ESP8266 boards of this library.
Main components
3
DRV8848PWP
HTSSOP-16-EP-40℃~+85℃ 2 2A 4V~18V 4V~18V 900mΩ Bipolar Driver Yes HTSSOP-16-EP Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
PCA9956BTWY
TSSOP-38-EP-40℃~+85℃ 24 31.25kHz 3V~5.5V 4% 57mA Analog、PWM DC-DC Over-Temperature Protection (OTP)、Short-Circuit Protection TSSOP-38-EP LED Drivers ROHSNXP SemiconductorsLED Drivers
CD74HC4067SM96
SSOP-24-208mil-55℃~+125℃ 15ns 16 16:1 2V~6V 5pF 70Ω 89MHz SSOP-24-208mil Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
README
README.md
PlatformSoftKeyboardControl
Control a 2 Degree of Freedom Platform using a soft sensing sheet.
This README is also used as the main page for the Doxygen-generated documentation. The remainder of this file contains project details, diagrams, and usage information.
PlatformSoftKeyboardControl
Project Goal:
Control a 2 Degree of Freedom Platform using a custom piezoresistive sensing sheet.
Mechanical Considerations
The balancing table is controlled by two motors connected to the table's surface via a strut with two ball joints that control rotation about perpendicular axes.
Software Design
Task Diagram
Webserver Task
The ESP32 hosts its own wifi on which it hosts a webpage on 192.168.5.1 that communicates the recorded data in csv forma to either the user or an external program that interprets it. The functionality of this task is based on an example by .
Motor Control Task
The motor control task awaits confirmation that the IMU has initialized and then begins operating the motor PIDs according to the setpoint stored in the xBar and yBar shares.
Material Reading Task
In order to perform EIT analysis, a series of voltage differences needs to be measured. For one complete measurement, one electrode is grounded while its neighboring electrode is supplied with a current while the remaining electrodes are used to measure the voltage differences. This is then repeated for each electrode. This task is responsible for taking those individual datapoints and reporting the resulting 208 values to the webpage task to be published in csv format.
PyEIT interpretation
A python script using the is able to read the data hosted by the webpage and analyze any changes in resistivity of the material. The resulting centroid is then passed back to the webpage using url arguments.
Other Code Used
- Liu, et al:
- bryanduxbury:
- yuskegoto:
- spluttflob:
-
- PrintStream Library https://github.com/spluttflob/Arduino-PrintStream.git
-
- ME507 Support Library https://github.com/spluttflob/ME507-Support.git
- madhephaestus:
Parts
52| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | TestPoint | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11 |
| 5 | 1kΩ | Resistor_SMD:R_0805_2012Metric | R8, R9, R10, R11, R14 |
| 4 | MountingHole | MountingHole:MountingHole_2.5mm | H1, H2, H3, H4 |
| 3 | 0.1μF | Capacitor_SMD:C_0805_2012Metric | C2, C4, C5 |
| 3 | 10kΩ | Resistor_SMD:R_0805_2012Metric | R1, R5, R13 |
| 2 | 4.7kΩ | Resistor_SMD:R_0805_2012Metric | R2, R6 |
| 2 | 500mΩ | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | ADC128D818 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U2, U3 |
| 2 | Conn_01x08_Socket | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J7, J8 |
| 2 | Conn_01x12_Socket | Connector_PinSocket_2.54mm:PinSocket_1x12_P2.54mm_Vertical | J5, J6 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric | R12 |
| 1 | 10μF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 2.2μF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 3.3kΩ | Resistor_SMD:R_0805_2012Metric | R7 |
| 1 | 470μF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C1 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_CUI_PJ-102AH_Horizontal | J1 |
| 1 | CD74HC4067SM | Package_SO:SSOP-24_5.3x8.2mm_P0.65mm | U5 |
| 1 | DRV8848 | Package_SO:TSSOP-16-1EP_4.4x5mm_P0.65mm | U6 |
| 1 | EXT IMU Connection | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J2 |
| 1 | Motor 1 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J3 |
| 1 | Motor 2 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J4 |
| 1 | Motor Encoder 1 | Connector_Molex:Molex_KK-396_A-41792-0005_1x05_P3.96mm_Horizontal | J10 |
| 1 | Motor Encoder 2 | Connector_Molex:Molex_KK-396_A-41792-0005_1x05_P3.96mm_Horizontal | J9 |
| 1 | NodeMCU | ME507F24:ESP32_NodeMCU_KeeYees | ESP1 |
| 1 | PCA9956BTWY | SamacSys_Parts:SOP50P640X110-39N | IC1 |
| 1 | TL071 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
Questions
How big is the SoftKeyboardController PCB?
It measures 87.1 × 78.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SoftKeyboardController use?
52 parts, built around the DRV8848PWP, PCA9956BTWY and CD74HC4067SM96. 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 SoftKeyboardController KiCad files?
From the Setting-Dawn/PlatformSoftKeyboardControl repository on GitHub, at the commit this page was made from: the board is hardware/SoftKeyboardController.kicad_pcb and its schematic hardware/SoftKeyboardController.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SoftKeyboardController design in my own project?
Its repository publishes it under the MIT 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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