2 layers12.5 × 23 mm
Epi
rallekralle11/Project_Epi
Extremely small arduino pro micro-style board mostly intended for PC peripherals
27 parts23
2 layers12.7 × 22.8 mm
Extremely small arduino pro micro-style board mostly intended for PC peripherals
- Size
- 12.7 × 22.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 45
- Pads
- 144
- Tracks, vias
- 483, 62
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 Oct 2022
- Updated
- 21 Jan 2023
Overview
Epi is an open-source printed circuit board by rallekralle11, from the rallekralle11/Project_Epi repository on GitHub. It is a 2-layer board of 12.7 × 22.8 mm with 32 parts on 45 nets, routed with 483 tracks and 62 vias.
It is built around the ATMEGA32U4-MU. Its parts include 10 capacitors, 9 resistors, 4 connectors, 1 IC and 1 diode. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdEpi
This thing is about to get launched on Crowd Supply!
Also take a look at the better 4-layered version: https://github.com/rallekralle11/Epi_4L
Named after the Epipactis genus or orchids. The flower of one appears on the board.
With such "amazing" features as:
Data line ESD protection taken from the official A. micro.
Crenellated pins.
No integrated voltage converter, only runs at 4,5-5,5v(down to 2,7 if you make it with an 8mhz crystal, or use the internal oscillator).
USB-C connector sunk into the board, and slighly portruding from the end for panel mounting.
1,27mm pin spacing.
Extra pins broken out.
Way too many hours routing for my sanity, and i doubt it's optimal(i am a beginner).
Holes where M2 bolts can be used to hold it in place.
No rx/tx/power LEDs. Only one on pin 13 for testing.
Includes some custom footprints with 3D models.
Size comparisons.
Licensed under CERN-OHL-P v2
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nf | Capacitor_SMD:C_0402_1005Metric | C1, C3, C4, C7, C9, C10 |
| 3 | 10kΩ | Resistor_SMD:R_0402_1005Metric | R3, R6, R7 |
| 3 | 5,1kΩ | Resistor_SMD:R_0402_1005Metric | R4, R5, R9 |
| 2 | 1µf | Capacitor_SMD:C_0402_1005Metric | C2, C8 |
| 2 | 22pf | Capacitor_SMD:C_0402_1005Metric | C5, C6 |
| 2 | 22Ω | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | Connector 1x12 | Connector_PinHeader_1.27mm:PinHeader_1x12_P1.27mm_Vertical | J1, J2 |
| 2 | ESD protection varistor | Resistor_SMD:R_0402_1005Metric | RV1, RV2 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2 |
| 1 | |||
| 1 | 1kΩ | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | ATmega32U4-M | Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U1 |
| 1 | Conn_01x05 | Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical | J3 |
| 1 | Crystal_GND24_Small | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | LED | LED_SMD:LED_0402_1005Metric | D1 |
| 1 | Polyfuse 500mA HC | Fuse:Fuse_0402_1005Metric | F1 |
| 1 | USB-C 2.0 mid-mount female connector | USB-C-Connectors-master:USB-C MC-314C-4P16 | J4 |
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Questions
How big is the Epi PCB?
It measures 12.7 × 22.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Epi use?
32 parts, built around the ATMEGA32U4-MU. 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 Epi KiCad files?
From the rallekralle11/Project_Epi repository on GitHub, at the commit this page was made from: the board is epi.kicad_pcb and its schematic epi.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Epi design in my own project?
Its repository states no licence, so its author keeps all rights: ask rallekralle11 before reusing the design.