2 layers81.2 × 81.2 mm
4 layers71 × 71 mm
SmartKnob Bachelorarbeit
LucasCanete/GermanSmartknobOn the front side there is a ring of RGB Leds for user feedback and at its center a magnetic encoder. The magnetic encoder is key to detect the rotation's direction of the BLDC Motor, that in this project is used as an…
- Size
- 71 × 71 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 111
- Nets
- 95
- Pads
- 481
- Tracks, vias
- 707, 307
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 May 2025
- Updated
- 23 Sep 2025
Overview
SmartKnob Bachelorarbeit is an open-source printed circuit board by LucasCanete, from the LucasCanete/GermanSmartknob repository on GitHub. It is a 4-layer board of 71 × 71 mm with 111 parts on 95 nets, routed with 707 tracks and 307 vias.
It is built around the ESP32-S3-MINI-1-N8, SN65HVD230D and SN74LV1T34DBV, with the MT6701CT-STD, NAU8822L and TMC6300-LA among its other parts. Its parts include 44 capacitors, 21 resistors, 10 ICs, 9 diodes and 5 connectors. It belongs with the ESP32 boards of this library.
Main components
12
ESP32-S3-MINI-1-N8
SMD-104.5dBm -40℃~+85℃ 2.4GHz 20.5dBm 330mA 3V~3.6V 97mA Bluetooth5.0 ESP32-S3FN8 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD WiFi Modules ROHSEspressif SystemsWiFi Modules
SN65HVD230D
SOIC-8-40℃~+85℃ 1 17mA 1Mbps 370uA 3V~3.6V CAN Transceiver Low-power mode、Wake-up function、ESD protection、Thermal shutdown protection、Bus fault protection、Hot-swap protection SOIC-8 CAN Transceivers ROHSTexas InstrumentsCAN Transceivers
SN74LV1T34DBV
SOT-23-5-40℃~+125℃ 1 1 1.6V~5.5V 10uA 5.5ns@5V,15pF 74LV 8mA 8mA Level shifting Push-pull Unidirectional SOT-23-5 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
MT6701CT-STD
SOP-8-40℃~+125℃ 0°~360° 1.75mm 10mA 3.3V~5V 3.9mm 5mm I2C、SSI Magnetic rotary position sensor No Programmable transmission、Zero position programming、Multi-axis magnetic field detection SOP-8 Position Sensors ROHSNOVOSENSEPosition SensorsNAU8822L
QFN-32-EP(5x5)QFN-32-EP(5x5) Audio Interface ICs ROHSNuvoton TechAudio Interface ICsTMC6300-LA
QFN-20(3x3)-40℃~+125℃ 2A 2A 2V~5.25V 3 30nA Interleaved conduction protection Three Phase Yes QFN-20(3x3) Brushless DC (BLDC) Motor Driver ROHSTRINAMIC Motion Control GmbHBrushless DC (BLDC) Motor Driver
TPS54202DDC
SOT23-64.5V to 28V Input, 2A Output, EMI Friendly Synchronous Step Down ConverterTexas InstrumentsUncategorised
VEML7700-TT
SMD-4P-25℃~+85℃ 120klx 16bit 2.35mm 2.5V~3.6V 3mm 6.8mm I2C Light Intensity Low power/sleep mode、Spectral correction/filtering、High dynamic range measurement、Adjustable gain control、Interrupt/event trigger、Built-in temperature compensation SMD-4P Ambient Light Sensors ROHSVishay IntertechnologyAmbient Light Sensors
AMS1117
1.0 A Low-Dropout Fixed RegulatorAdvanced Monolithic SystemsUncategorised
SK6812SIDE-A
SMD-4P,4x1.6mm-40℃~+85℃ 0.6mA 1.6mm 120° 160mcd~320mcd 1kHz 2000V 240mcd~450mcd 2mm 3.7V~5.5V 460nm~470nm 4mm 520nm~535nm 620nm~625nm 697.5mcd~1162.5mcd 800Kbit/s Built-in power-on reset circuit Translucent Frosted Lens SMD-4P,4x1.6mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
K22
SOD-123FLSchottky DiodesDoeshare
NUP2105L
SOT-23-55℃~+150℃ 100nA 2 24V 30pF 32V 350W@8/20us 44V 8A@8/20us Bidirectional IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 TVS SOT-23 ESD and Surge Protection (TVS/ESD) ROHSonsemiESD And Surge Protection (TVS/ESD)
README
README.mdGerman Smartknob
An ESP32-S3 based knob to control smart devices at home. Based on Scott Bez's Smartknob: https://github.com/scottbez1/smartknob?tab=readme-ov-file. Adapted for the standard german wall socket.
Table of Contents
About the project
This project mechatronic project has three main parts. The first part consisted of the development of a PCB that could fit in the standard german wall socket and would control sensors, touch display and a BLDC Motor. The second part consisted on 3d printed pieces to sustain the PCB on its place, allow BLDC rotation while keeping the touch display on its place. Finally the third part was the software, which tested that all sensors and actuators worked accordingly. The final product can be seen below.
German Smartknob
Features
- ESP32-S3 based PCB
- Input Voltage of up to 24V
- Haptic Feedback with a BLDC-Motor (Coming soon)
- Touch Display
- Brightness and Temperature Sensor
- Audio speaker connectors
Components
A summarized description of this products three main parts.
PCB
The PCB was designed to fit into the standard german wall socket. It has two sides.
On the front side there is a ring of RGB Leds for user feedback and at its center a magnetic encoder. The magnetic encoder is key to detect the rotation's direction of the BLDC Motor, that in this project is used as an input device, similar to a rotary encoder. The reason why a BLDC Motor was chosen and not a regular rotary encoder, is because with the first, through proper driver, it is possible to program the motor's torque and adjust it according to the user's use. Besides of this, at the sides of the Front-PCB there are sensors to detect the temperature, the room's brightness and also output audio via a speaker.
Figure 1: Front side PCB
On the back side there are connectors available to supply the PCB with 24V, 3.3v and extra outputs with I2C and CAN lines. The Display connector pads, the ESP32-S3, and the audio and bldc driver are also found on the back side of the PCB.
Figure 2: Backside PCB
3D printed Parts
Using the OnShape CAD tool several 3D pieces were designed, that later were 3d printed. The pieces include a holder for the BLDC Motor to keep it in the middle; a holder for the display, a knob and a case to hide the electronic. Below is an exploded view of the internal pieces of the smartknob.
Figure 3: Internal Pieces
Software
The software was built using the arduino libraries, for simplicities sake. The main goal of the software program was to demonstrate the correct functioning of the main features of the smartknob. Because of this, a small Manu was programmed in which 4 main features can be selected as options. With a tap on the touch display the option can be selected and the functioning of the feature can be demonstrated.
The four menu options and what each of them does is represented with the diagram below:
Figure 4: Software Diagram
Getting Started
Download this repo
git clone https://github.com/LucasCanete/GermanSmartknob.gitBuild and upload
How To Use
Project Status
This project is still under development. Eventhough the first version was successful, improvements are still coming to the software side. Some of them are:
- Full implementation of haptic feedback
- Connection to smart devices over MQTT, home assistant, etc
Parts
111| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C15, C17, C18, C35, C36, C37, C38, C39, C40, C41, C42 |
| 10 | 10K | Resistor_SMD:R_0201_0603Metric | R1, R6, R13, R14, R15, R16, R17, R18, R19, R22 |
| 8 | SK6812SIDE-A | liebler_OPTO:SK6812_SIDE_A_handsolder | D2, D3, D4, D5, D6, D7, D8, D9 |
| 7 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C22, C23, C24, C26, C34, C43 |
| 6 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C25, C27, C28, C29, C32, C33 |
| 5 | 3K3 | Resistor_SMD:R_0201_0603Metric | R7, R9, R10, R11, R12 |
| 3 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3 |
| 2 | 1uF | Capacitor_Tantalum_SMD:CP_EIA-2012-12_Kemet-R | C30, C31 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C12, C14 |
| 2 | 22uF | Capacitor_SMD:C_0603_1608Metric | C9, C10 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11, C13 |
| 2 | MountingHole | MountingHole:MountingHole_2.1mm | H4, H4 |
| 1 | 0.1uF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C3 |
| 1 | 0.1uF/16V | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 0.1uF/35V | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 10n/50V | Capacitor_SMD:C_0402_1005Metric | C19 |
| 1 | 10u | Inductor_SMD:L_APV_APH0630 | L1 |
| 1 | 10u | Capacitor_SMD:C_0402_1005Metric | C20 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C45 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C16 |
| 1 | 10uF/35V | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 120 | Resistor_SMD:R_0201_0603Metric | R21 |
| 1 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 22uF | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 2K2 | Resistor_SMD:R_0201_0603Metric | R20 |
| 1 | 56pF | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 600R | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | AMS1117 | liebler_SEMICONDUCTORS:SOT-223-3_TabPin2_HANDSOLDER | U3 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2 |
| 1 | BaseConnect | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical_SMD | J1 |
| 1 | CLK | TestPoint:TestPoint_Pad_D2.0mm | TP4 |
| 1 | CSN | TestPoint:TestPoint_Pad_D2.0mm | TP3 |
| 1 | Conn_01x12_Pin | SolderPads:SolderPads_2mm_12 | J4 |
| 1 | Conn_motor | Connector_Molex:Molex_PicoBlade_53261-0371_1x03-1MP_P1.25mm_Horizontal | J2 |
| 1 | DO | TestPoint:TestPoint_Pad_D2.0mm | TP5 |
| 1 | ESP32-S3-MINI-1 | RF_Module:ESP32-S2-MINI-1 | U1 |
| 1 | Jumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP1 |
| 1 | K22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | LED_DATA | TestPoint:TestPoint_Pad_D2.0mm | TP9 |
| 1 | LLIN | TestPoint:TestPoint_Pad_D2.0mm | TP1 |
| 1 | LOGO | pcb_images:hs_osna_5 | G*** |
| 1 | MCP9808_MSOP | Package_SO:MSOP-8_3x3mm_P0.65mm | U9 |
| 1 | MT6701CT | Package_SO:SO-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | Microphone_Condenser | Sensor_Audio:POM-2244P-C3310-2-R | MK1 |
| 1 | NAU8822 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.6x3.6mm_ThermalVias | U6 |
| 1 | NUP2105L | Package_TO_SOT_SMD:SOT-23 | D10 |
| 1 | PROG | Connector_PinHeader_1.27mm:PinHeader_2x03_P1.27mm_Vertical_SMD | J3 |
| 1 | RLIN | TestPoint:TestPoint_Pad_D2.0mm | TP2 |
| 1 | RST | Button_Switch_SMD:SW_SPST_B3U-1000P | SW1 |
| 1 | SN65HVD230 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | SN74LV1T34DBV | Package_TO_SOT_SMD:SOT-23-5 | U7 |
| 1 | SW_SPDT_with_Case | liebler_MECH:SW_SPDT_PCM12_handsolder | SW3 |
| 1 | Speaker_out | SolderPads:SolderPads_2mm_2 | J5 |
| 1 | TMC6300-LA | TMC6300:QFN40P300X300X90-21N | IC1 |
| 1 | TPS54202DDC | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | U | TestPoint:TestPoint_Pad_D2.0mm | TP7 |
| 1 | V | TestPoint:TestPoint_Pad_D2.0mm | TP8 |
| 1 | VEML7700-TT | VEML7700:VEML7700 | IC2 |
| 1 | W | TestPoint:TestPoint_Pad_D2.0mm | TP6 |
| 1 | u1 | Capacitor_SMD:C_0402_1005Metric | C21 |
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Questions
How big is the SmartKnob Bachelorarbeit PCB?
It measures 71 × 71 mm and has 4 copper layers, 1.6 mm thick.
What parts does the SmartKnob Bachelorarbeit use?
111 parts, built around the ESP32-S3-MINI-1-N8, SN65HVD230D, SN74LV1T34DBV and MT6701CT-STD. 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 SmartKnob Bachelorarbeit KiCad files?
From the LucasCanete/GermanSmartknob repository on GitHub, at the commit this page was made from: the board is Hardware/SmartKnob_V2/SmartKnob_Bachelorarbeit.kicad_pcb and its schematic Hardware/SmartKnob_V2/SmartKnob_Bachelorarbeit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SmartKnob Bachelorarbeit design in my own project?
Its repository states no licence, so its author keeps all rights: ask LucasCanete before reusing the design.