2 layers20.4 × 34.3 mm
2 layers80 × 100 mm
SIMP - Simple 4x4 Macropad
- Size
- 80 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 61
- Pads
- 251
- Tracks, vias
- 314, 19
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 16 May 2023
- Updated
- 31 May 2026
Overview
Simp is an open-source printed circuit board by leonbcode, from the leonbcode/simp-keyboard repository on GitHub, published under the MIT licence. It is a 2-layer board of 80 × 100 mm with 59 parts on 61 nets, routed with 314 tracks and 19 vias.
It is built around the ATMEGA32U4-MU and USBLC6-2P6. Its parts include 17 diodes, 16 switches, 8 capacitors, 6 resistors and 3 connectors. It belongs with the keyboards and input and lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U4-MU
VQFN-44-EP(7x7)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH VQFN-44-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
README
README.mdSIMP - Simple Macro Pad
SIMP is a simple macro pad with a 4×4 key matrix and an OLED display.
About
SIMP is a hobby project that helps me learn about microcontrollers and embedded systems. The project aims to create a simple and versatile macro pad for everyday use.
This repository contains the PCB design files. The focus is on a compact layout, straightforward hardware, and a design that stays approachable.
A dedicated firmware can be found here: simp-firmware.
A fitting case design can be found here: simp-case.
Features
- 4×4 key matrix
- OLED display
- USB-C
- Compact and simple design
License
This project is licensed under the MIT License.
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | D | Diode_SMD:D_SOD-123 | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 16 | MX_SW_solder | marbastlib-mx:SW_MX_1u | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6, C7 |
| 4 | tooling hole | MountingHole:MountingHole_2.1mm | , , , |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 22 | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric | C2, C3 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 500mA | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | ATmega32U4-M | Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U1 |
| 1 | AVR-ISP-6 | Connector_PinSocket_2.54mm:PinSocket_2x03_P2.54mm_Vertical | J1 |
| 1 | D_Schottky | Diode_SMD:D_SOD-123F | D17 |
| 1 | I2C | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | LOGO | LOGO | G*** |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
Questions
How big is the Simp PCB?
It measures 80 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Simp use?
59 parts, built around the ATMEGA32U4-MU and USBLC6-2P6. 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 Simp KiCad files?
From the leonbcode/simp-keyboard repository on GitHub, at the commit this page was made from: the board is simp.kicad_pcb and its schematic simp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Simp 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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