HardLabs

J3-mez-2040

tangybbq·keyboard·jolt3/j3-mez-2040/j3-mez-2040.kicad_pcb

J3-mez-2040 PCB layout, top view — open source RP2040/RP2350 board by tangybbq
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About the J3-mez-2040 PCB

J3-mez-2040 is an open source RP2040/RP2350 PCB design by tangybbq, published on GitHub. It is a 4-layer board measuring 38 × 38 mm, with 36 components from 23 distinct parts.

Its main chip is the MAX40200AUK, from the RP2040/RP2350 family. Other key parts include the AP2112-M3.3 and W25Q128JVP. By type, the board carries 16 capacitors, 10 resistors, 3 ICs, 2 connectors, 2 switches and 2 diodes.

It belongs with the keyboards designs in this gallery.

From the project

Design files for my keyboards

The Jolt 2, with the varying-elevation design has turned out to be a rather nice keyboard to use. However there are some challenges:

- Even with sockets, assembling all of the key risers is quite time consuming. This makes it more challenging to experiment with the rest of the electronics. - With more circuitry on the main board, the left/right distinction greatly increases the work to try a new design.

Main components on the J3-mez-2040

MAX40200AUKAP2112-M3.3W25Q128JVP

J3-mez-2040 bill of materials (BOM)

36 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MAX40200AUK
RP2040
U1
1
AP2112-M3.3
U2
1
W25Q128JVP
U3
1
ABM8-272-T3
Y1
1
CONN_01X02
~
J1
1
USB_C_Receptacle_USB2.0_14P
J29
2
SW_SPST
SW1, SW2
2
BAV19W
SK6812MINI-HS
D1, D2
2
4.7UF
10u
C1, C2
1
4.7UF
100n
C3
1
1UF
100n
C4
1
1UF
1u
C5
1
4.7UF
1u
C6
1
100NF
100n
C7
7
100n
C8, C9, C10, C11, C12, C13, C16
2
12p
C14, C15
3
27
R1, R9, R10
1
180K
27
R2
2
5.1K
5.1k
R3, R4
1
5.1K
1k
R5
Show 3 more
QtyPartRefs
1
2.2
1k
R6
1
2.2
10k
R7
1
180K
1k
R8

J3-mez-2040 design files

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

J3-mez-2040: common questions

What microcontroller does the J3-mez-2040 use?

The J3-mez-2040 is built around the MAX40200AUK, from the RP2040/RP2350 family.

How big is the J3-mez-2040 PCB?

The J3-mez-2040 measures 38 × 38 mm, has 4 copper layers and is 1 mm thick.

How many components are on the J3-mez-2040?

36 components, from 23 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 J3-mez-2040 design files?

From the tangybbq/keyboard 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 J3-mez-2040 design in my own project?

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

Can I test firmware for the J3-mez-2040 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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