LK23M
About the LK23M PCB
LK23M is an open source PCB design by lambdakb, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 76.2 × 119.1 mm, with 55 components from 10 distinct parts.
Other key parts include the ProMicro_RP2040. By type, the board carries 25 switches, 23 diodes, 4 capacitors, 1 IC, 1 connector and 1 LED.
It belongs with the keyboards designs in this gallery.
From the project
LK23M Numpad / Macropad
This keyboard has been designed as a standalone numpad with an extra top row to be used as a macro pad or media pad, as such, it can be configured in different ways when building it.
Here is the list of supported variations:
- Optional encoder on the top left key - Optional encoder on the top right key - The top two center keys can be replaced by a 0.91" OLED screen
Main components on the LK23M
LK23M bill of materials (BOM)
55 components, 10 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ProMicro_RP2040 | MCU_KB2040_DIP-24_Socket_Reverse | U1 |
| 1 | Conn_01x02 | JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 2 | RotaryEncoder_Switch_MP | SW_MX_EC11_THT_sqSilk | SW1, SW4 |
| 2 | SW_Push | SW_MX_THT_sqSilk | SW2, SW3 |
| 19 | SW_Push | SW_MX_HotSwap_THT_sqSilk | SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12 +11 |
| 1 | SW_Push | SW_Push_1P1T_6x3.5mm | SW24 |
| 1 | C221841 SW_SPST | SW_SPDT_PCM12 | SW25 |
| 1 | OLED_I2C_SSD1306 | OLED_SSD1306_128x32_0.91inch_I2C_btmSilk | OL1 |
| 23 | 1N4148 | Diode_SMD+THT_SOD123_DO35_P6.5mm | D1, D2, D3, D4, D5, D6, D7, D8 +15 |
| 4 | 100NF 100nF | Capacitor_SMD+THT_1206_5.0x2.5mm_P5.00mm | C1, C2, C3, C4 |
LK23M design files
The KiCad project lives in the lambdakb/keyboard-lk23m repository on GitHub; these links point at the commit this page was built from.
LK23M: common questions
How big is the LK23M PCB?
The LK23M measures 76.2 × 119.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the LK23M?
55 components, from 10 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the LK23M design files?
From the lambdakb/keyboard-lk23m repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the LK23M design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
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