2 layers88.9 × 71.1 mm
STM SDR
Beacroxx/STM-SDR
A portable FM radio receiver with OLED display, built on STM32F411CEU6 microcontroller with SI4732-A10 software-defined radio chip.
64 partsGPL-3.0
2 layers110 × 140 mm
Keypad PCB REV 3.0
yuhkm/STM32_Calculator_KeypadSTM32 Based USB Keypad and Calculator
- Size
- 110 × 140 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 111
- Nets
- 95
- Pads
- 519
- Tracks, vias
- 702, 138
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 1 Aug 2025
- Updated
- 1 Aug 2025
Overview
Keypad PCB REV 3.0 is an open-source printed circuit board by yuhkm, from the yuhkm/STM32_Calculator_Keypad repository on GitHub. It is a 2-layer board of 110 × 140 mm with 111 parts on 95 nets, routed with 702 tracks and 138 vias.
It is built around the TPS63001DRC, SK-12D02-VG7 and TS-1088-AR02016, with the AO3401A, Q13FC1350000400 and SS14 among its other parts. Its parts include 24 diodes, 19 capacitors, 16 resistors, 5 switches and 4 connectors. It belongs with the keyboards and input boards and the STM32 boards of this library.
Main components
7
TPS63001DRC
VSON-10-EP(3x3)-40℃~+85℃@(TA) 1 1.5MHz 1.8V~5.5V 3.3V 50uA Buck-Boost Buck-Boost Built-in Fixed Yes VSON-10-EP(3x3) DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
SK-12D02-VG7
插件,8.6x4.6mm4.6mm 8.6mm Black PC Pin Rectangular Columnar Right Angle SPDT 插件,8.6x4.6mm Slide Switches ROHSDEALONSlide Switches
TS-1088-AR02016
SMD,4x3mm-30℃~+80℃ 1.6N 100,000 cycles 12V 2mm 3.9mm 3mm 50mA Black Round Button SMD(SMT) Tab SPST Surface Mount,Vertical Without Bracket SMD,4x3mm Tactile Switches ROHSXUNPUTactile Switches
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsQ13FC1350000400
SMD3215-2PSMD3215-2P Crystals ROHSSeiko EpsonCrystals
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
X322525MOB4SI
SMD3225-4P-40℃~+85℃ 12pF 25MHz 50Ω Crystal Oscillator ±10ppm ±20ppm SMD3225-4P Crystals ROHSYXCCrystals
README
README.mdSTM32_Calculator_Keypad
STM32 Based USB Keypad and Calculator Project
Overview
Development Period : 2024.08 ~ 2024.11
HW
- MCU : STM32F401RET6
- Displsy : ST7789 1.9" TFT LCD
- Battery : Li-Po 500mAh 3.7V
- Interface: USB (for keypad mode and charging)
- Switches: Cherry MX compatible mechanical switches
( Kailh hot-swap sockets )
SW
- Maximum expression length: 70 characters
- Calculator supported Operations
Basic arithmetic : +, -, ×, ÷
Parentheses : (), {}, []
Trigonometric functions : sin, cos, tan
Planned support for : asin, acos, atan, log, ln
Key Features
- Mode 0 : Calculator
- Mode 1 : USB Keypad
| USB C | Power S/W | Mode S/W | Function | Power source |
|---|---|---|---|---|
| 0 | 0 | X | Power off | - |
| 0 | 1 | 0 | Calculator mode | Battery |
| 0 | 1 | 1 | - | - |
| 1 | 0 | X | Power off | Battery charge |
| 1 | 1 | 0 | Calculator mode | USB + Battery charge |
| 1 | 1 | 1 | USB Keypad mode | USB + Battery charge |
Parts
111| Qty | Value | Footprint | References |
|---|---|---|---|
| 22 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22 +6 |
| 22 | MX_SW_HS | PCM_marbastlib-mx:SW_MX_HS_CPG151101S11_1u | MX1, MX2, MX3, MX10, MX11, MX12, MX13, MX14, MX15, MX16, MX17, MX18, MX19, MX20, MX21, MX22 +6 |
| 10 | Pad | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad_TopBottom | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10 |
| 8 | 100nF(0603) | Capacitor_SMD:C_0603_1608Metric | C2, C5, C9, C10, C11, C12, C13, C14 |
| 7 | 10kR(0603) | Resistor_SMD:R_0603_1608Metric | R3, R7, R8, R9, R10, R11, R16 |
| 3 | 10uF(0603) | Capacitor_SMD:C_0603_1608Metric | C1, C3, C4 |
| 3 | MX_stab | PCM_marbastlib-mx:STAB_MX_P_2u | ST9, ST19, ST20 |
| 2 | 15pF(0603) | Capacitor_SMD:C_0603_1608Metric | C17, C18 |
| 2 | 18pF(0603) | Capacitor_SMD:C_0603_1608Metric | C15, C16 |
| 2 | 1kR(0603) | Resistor_SMD:R_0603_1608Metric | R12, R13 |
| 2 | 1uF(0603) | Capacitor_SMD:C_0603_1608Metric | C6, C8 |
| 2 | 22R(0603) | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 5.1kR(0603) | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | LED1, LED2 |
| 2 | SK-12D02-VG7 | SK-12D02-VG7:SK12D02VG7 | SW1, SW2 |
| 2 | TS-1088-AR02016 | TS-1088-AR02016:TS1088AR02016 | SW3, SW4 |
| 1 | 100R(0603) | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 2.2uH | Inductor_SMD:L_Bourns_SRP7028A_7.3x6.6mm | L1 |
| 1 | 30kR(0603) | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 4.7uF(0603) | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 7.5kR(0603) | Resistor_SMD:R_0603_1608Metric | R15 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_01x02_Socket | Connector_Molex:Molex_SPOX_5267-02A_1x02_P2.50mm_Vertical | J2 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J4 |
| 1 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Horizontal | J5 |
| 1 | NU(0603) | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C19 |
| 1 | Q13FC1350000400 | 32.768khz:Q13FC1350000400 | Y2 |
| 1 | RotaryEncoder_Switch_MP | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW5 |
| 1 | SS14 | Diode_SMD:D_SMA | SD1 |
| 1 | STM32F401RETx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | TPS63001 | Package_SON:Texas_DRC0010J_ThermalVias | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J1 |
| 1 | X322525MOB4SI | 25Mhz:X322525MOB4SI | Y1 |
| 1 | ~ | Lipo:TP4056_Module | U2 |
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Welcome to my PCB projects repository! This space is dedicated to documenting my journey in designing, creating, and improving printed circuit boards (PCBs).
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Questions
How big is the Keypad PCB REV 3.0 PCB?
It measures 110 × 140 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keypad PCB REV 3.0 use?
111 parts, built around the TPS63001DRC, SK-12D02-VG7, TS-1088-AR02016 and AO3401A. 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 Keypad PCB REV 3.0 KiCad files?
From the yuhkm/STM32_Calculator_Keypad repository on GitHub, at the commit this page was made from: the board is CAD_PCB/Main_board/Keypad_PCB_REV_3.0/Keypad_PCB_REV_3.0.kicad_pcb and its schematic CAD_PCB/Main_board/Keypad_PCB_REV_3.0/IO_sch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keypad PCB REV 3.0 design in my own project?
Its repository states no licence, so its author keeps all rights: ask yuhkm before reusing the design.