LeeChee
About the LeeChee PCB
LeeChee is an open source AVR/Arduino PCB design by Gacathon, published on GitHub. It is a 2-layer board measuring 378.4 × 156.9 mm, with 556 components from 76 distinct parts.
Its main chip is the ATMEGA32U4, from the AVR/Arduino family. Other key parts include the CH440G, 74HC138, FE2.1, PCM2912A and PAM8406. By type, the board carries 142 LEDs, 74 capacitors, 47 resistors, 8 ICs, 6 inductors and 5 transistors.
It belongs with the keyboards designs in this gallery.
From the project
Cherry G80&G81-1800 Keyboard layout
Main components on the LeeChee
LeeChee bill of materials (BOM)
556 components, 76 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH440G | SOIC-16_3.9x9.9mm_Pitch1.27mm | U1 |
| 1 | ATMEGA32U4 | TQFP-44_10x10mm_Pitch0.8mm | U2 |
| 1 | 74HC138 | SOIC-16_3.9x9.9mm_Pitch1.27mm | U3 |
| 1 | FE2.1 | LQFP-48_7x7mm_Pitch0.5mm | U4 |
| 1 | PCM2912A | TQFP-32_7x7mm_Pitch0.8mm | U5 |
| 1 | PAM8406 | SOIC-16_3.9x9.9mm_Pitch1.27mm | U6 |
| 1 | TPA152 | SOIC-8_3.9x4.9mm_Pitch1.27mm | U7 |
| 1 | TPS2062 | SOIC-8_3.9x4.9mm_Pitch1.27mm | U8 |
| 5 | SI2305 | SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 1 | 16MHz | X_SMD_5032-2pin_5.0x3.2mm | Y1 |
| 1 | 12MHz | X_SMD_5032-2pin_5.0x3.2mm | Y2 |
| 1 | 6MHz | X_SMD_5032-4pin_5.0x3.2mm | Y4 |
| 1 | JUMP3 | JUMP3_0805_Hand | J1 |
| 1 | CONN_01X02 | Pin_Header_Straight_1x02_Pitch2.54mm | J2 |
| 1 | CONN_01X01 | Pin_Header_Straight_1x01_Pitch2.54mm | J3 |
| 1 | CONN_01X04 | Pin_Header_Straight_1x04_Pitch2.54mm | DOWN1 |
| 4 | USB_A | USB_A | DOWN2, DOWN3, DOWN5, DOWN6 |
| 4 | USB_A | USB_A_10mm | DOWN2_2, DOWN3_2, DOWN5_2, DOWN6_2 |
| 2 | PJ-343 | PJ-343 | HEADPHONE1, MICROPHONE1 |
| 6 | HOLE | HOLE_4mm | HOLE1_2, HOLE2, HOLE4, HOLE6, HOLE10, HOLE11 |
Show 56 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | HOLE | HOLE_6mm | HOLE3 |
| 1 | HOLE | HOLE_6X11MM | HOLE5 |
| 3 | HOLE | HOLE_3.5mm | HOLE7, HOLE8, HOLE9 |
| 108 | 4148 | D_0805&LL4148 | KBD1, KBD2, KBD3, KBD4, KBD5, KBD6, KBD7, KBD8 +100 |
| 108 | 330R | R_0805 | KBR1, KBR2, KBR3, KBR4, KBR5, KBR6, KBR7, KBR8 +100 |
| 1 | AVR-ISP-6 | Pin_Header_Straight_2x03_Pitch2.54mm | KB_ICSP1 |
| 13 | MX_FRAME_HOLE | MX_FRAME_2X | MX_FRAME_BSPC_1, MX_FRAME_DEL_1, MX_FRAME_END_1, MX_FRAME_ENT_1, MX_FRAME_HOME_1, MX_FRAME_INS_1, MX_FRAME_LSFT_1, MX_FRAME_P-_1 +5 |
| 3 | MX_FRAME_HOLE | MX_FRAME_3X | MX_FRAME_SPC_1, MX_FRAME_SPC_2, MX_FRAME_SPC_3 |
| 1 | MX_FRAME_HOLE | MX_FRAME_6X | MX_FRAME_SPC_4 |
| 1 | MX_FRAME_HOLE | MX_FRAME_6.25X | MX_FRAME_SPC_5 |
| 1 | MX_FRAME_HOLE | MX_FRAME_7X | MX_FRAME_SPC_6 |
| 2 | CONN_01X02 | Pin_Header_Straight_1x02_Pitch2.54mm | SP1_2, SP2_2 |
| 1 | SWITCH | SWITCH-3X6X2.5_SMD+ | SW2 |
| 1 | DIP4WAY | SW_DIP_x4_W7.62mm_Slide_LowProfile | SW_ALLIN1 |
| 1 | MINI_USB | USB_MINI_4FOOT | USB1 |
| 1 | USB_B | USB_B | USB2 |
| 1 | USB_OTG | USB_MICRO_4FOOT_LONG | USB3 |
| 1 | USB_OTG | USB_MICRO_4FOOT | USB4 |
| 3 | LED | LED_D3.0mm | LED1, LED2, LED3 |
| 2 | LED | LED_0805 | LED5, LED6 |
| 117 | CherryMX | MX1-X-led | MX_0_1, MX_1_1, MX_2_1, MX_3_1, MX_4_1, MX_5_1, MX_6_1, MX_7_1 +109 |
| 11 | CherryMX | MX1-B-led | MX_ADD_1, MX_APP_3, MX_BSPC_2, MX_HOME_2, MX_INS_2, MX_LALT_1, MX_LCTL_1, MX_PGUP_2 +3 |
| 3 | CherryMX | MX1-C-led | MX_APP_1, MX_CAPS_1, MX_LGUI_2 |
| 4 | CherryMX | MX1-A-led | MX_LGUI_1, MX_LSFT_1, MX_RSFT_1, MX_SPC_2 |
| 2 | Speaker | Pin_Header_Angled_1x02_Pitch2.54mm | SP1, SP2 |
| 2 | 1N5817 | D_0805 | D1, D2 |
| 4 | 2A/120 | L_0805 | FB1, FB2, FB3, FB4 |
| 2 | 1uH | L_0805 | L1, L2 |
| 4 | 22pF | C_0805 | C1, C2, C73, C74 |
| 22 | 1uF | C_0805 | C3, C8, C19, C20, C21, C29, C36, C38 +14 |
| 17 | 0.1uF | C_0805 | C4, C5, C6, C7, C12, C13, C14, C15 +9 |
| 5 | 10uF | C_0805 | C9, C11, C45, C51, C53 |
| 1 | 4.7uF | C_0805 | C10 |
| 11 | 100uF | Tantalum_D_7343 | C22, C23, C24, C25, C26, C27, C28, C41 +3 |
| 2 | 100pF | C_0805 | C32, C33 |
| 2 | 3.3uF | C_0805 | C34, C37 |
| 4 | 220pF | C_0805 | C46, C47, C48, C49 |
| 2 | 22nF | C_0805 | C60, C61 |
| 2 | 330uF | Tantalum_D_7343 | C66, C67 |
| 2 | 22uF | C_0805 | C71, C72 |
| 2 | 22R | R_0805 | R1, R2 |
| 13 | 10kR | R_0805 | R3, R4, R5, R26, R27, R28, R41, R42 +5 |
| 3 | 330R | R_0805 | R6, R7, R8 |
| 2 | 100kR | R_0805 | R9, R12 |
| 1 | 2.7kR | R_0805 | R10 |
| 1 | 47kR | R_0805 | R11 |
| 2 | 33R | R_0805 | R13, R14 |
| 1 | 1.5kR | R_0805 | R15 |
| 1 | 1kR | R_0805 | R17 |
| 4 | 3.3kR | R_0805 | R18, R19, R20, R21 |
| 2 | 820R | R_0805 | R22, R23 |
| 3 | 0R | R_0805 | R24, R39, R40 |
| 2 | 10R | R_0805 | R25, R48 |
| 2 | 16R | R_0805 | R29, R30 |
| 6 | 20kR | R_0805 | R31, R32, R33, R34, R35, R36 |
| 2 | 100R | R_0805 | R37, R38 |
LeeChee design files
The KiCad project lives in the Gacathon/LeeChee repository on GitHub; these links point at the commit this page was built from.
- Layout1800.kicad_pcb
LeeChee: common questions
What microcontroller does the LeeChee use?
The LeeChee is built around the ATMEGA32U4, from the AVR/Arduino family.
How big is the LeeChee PCB?
The LeeChee measures 378.4 × 156.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the LeeChee?
556 components, from 76 distinct parts. The full bill of materials is listed on this page.
Where can I download the LeeChee design files?
From the Gacathon/LeeChee repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the LeeChee design in my own project?
The repository has no license, so all rights stay with Gacathon. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the LeeChee without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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