HardLabs

EPKeychain

Brammert42·EPKeychain·HardwareFiles/PCBA/V3/KeyChain.kicad_pcb

EPKeychain PCB layout, top view — open source RP2040/RP2350 board by Brammert42

About the EPKeychain PCB

EPKeychain is an open source RP2040/RP2350 PCB design by Brammert42, published on GitHub. It is a 2-layer board measuring 37.3 × 31.8 mm, with 83 components from 26 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C7419952 and C5258281. By type, the board carries 49 capacitors, 12 resistors, 6 diodes, 4 switches, 3 ICs and 3 transistors.

It belongs with the displays & leds designs in this gallery.

From the project

A keychain equipped with a RP2040 and a E-ink

EPKeychain, from the project README
From the project README

Main components on the EPKeychain

C7419952C5258281C2040

EPKeychain bill of materials (BOM)

83 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C7419952
MCP1802x-xx02xOT
U1
1
C5258281
ZD25WQ32CEIGR
U4
1
C2040
RP2040
U5
2
C20917
AO3400A
Q1, Q3
1
C15127
AO3401A
Q2
1
C9002
ABM8-272-T3
Y1
1
C262669
Conn_01x24
J2
1
C668588
USB_B_Micro
J5
1
C2979177
BAT-HLD-001-THM
J11
3
C5127964
SW_Omron_B3FS
SW1, SW3, SW6
1
C318884
SW_MEC_5E
SW2
1
dnf
TestPoint
TP1
3
C8598
MBR0530
D1, D2, D3
2
C3021104
ESD9B3.3ST5G
D4, D5
1
C12744
LBAT54HT1G
D6
1
C295164
68uH
L1
13
C307331
100n
C1, C7, C17, C18, C19, C21, C23, C24 +5
21
C23733
10u
C2, C15, C16, C29, C30, C34, C35, C36 +13
13
C52923
1uF
C3, C4, C5, C6, C8, C9, C10, C11 +5
2
C1548
15p
C13, C14
Show 6 more
QtyPartRefs
4
C25744
10k
R1, R10, R13, R14
1
C321178
3
R2
2
C11702
1k
R4, R6
1
dnf
DNF
R5
2
C25100
27
R7, R8
2
C25792
47k
R9, R11

EPKeychain design files

The KiCad project lives in the Brammert42/EPKeychain repository on GitHub; these links point at the commit this page was built from.

EPKeychain: common questions

What microcontroller does the EPKeychain use?

The EPKeychain is built around the C2040, from the RP2040/RP2350 family.

How big is the EPKeychain PCB?

The EPKeychain measures 37.3 × 31.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EPKeychain?

83 components, from 26 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 EPKeychain design files?

From the Brammert42/EPKeychain 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 EPKeychain design in my own project?

The repository has no license, so all rights stay with Brammert42. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the EPKeychain without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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