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Overnumpad controller 1xb

purdeaandrei·overnumpad_controller_1xb·controller/controller.kicad_pcb

Overnumpad controller 1xb PCB layout, top view — open source STM32 board by purdeaandrei
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About the Overnumpad controller 1xb PCB

Overnumpad controller 1xb is an open source STM32 PCB design by purdeaandrei, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 69.6 × 37.3 mm, with 65 components from 29 distinct parts.

Its main chip is the STM32F446RETX, from the STM32 family. Other key parts include the AMS1117-3.3, TPS2553DBVR, USBLC6-2SC6 and 24LC64. By type, the board carries 20 capacitors, 18 resistors, 6 diodes, 5 ICs, 5 connectors and 3 transistors.

It belongs with the keyboards designs in this gallery.

From the project

An open source replacement keyboard controller for 4th generation IBM/Lexmark keyboards, and for some Unicomp keyboards

This is a replacement keyboard controller, for 4th generation IBM/Lexmark Model M keyboards, and Unicomp keyboards that use the same mounting style over the numpad.

Only some of the listed supported keyboards has been tested at the time of release. Some keyboards may require additional software work for support. This list may change in the future.

* IBM/Lexmark 4th generation Model M keyboards See here for more detail on IBM Model M keyboard generations. The easiest way to identify IBM/Lexmark keyboards supported by this controller is to look at the lock lights led alignment. Top-aligned…

Overnumpad controller 1xb, from the project README
From the project README

Main components on the Overnumpad controller 1xb

AMS1117-3.3STM32F446RETXTPS2553DBVRUSBLC6-2SC624LC64

Overnumpad controller 1xb bill of materials (BOM)

65 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AMS1117-3.3
U1
1
STM32F446RETX
STM32F446RETx
U2
1
TPS2553DBVR
U3
1
USBLC6-2SC6
U4
1
24LC64
U5
1
C700954
Q_PMOS_GSD AO3401A
Q1
2
C8545
Q_NMOS_GSD 2N7002
Q2, Q3
1
16MHZ
16MHz
Y1
1
Conn_01x25_Membrane
J1
1
Conn_01x04
J2
1
Conn_Solenoid_Driver
J3
1
Conn_01x01
J4
1
Conn_01x06
J6
3
MountingHole
H1, H2, H3
1
SolderJumper_2_Bridged
JP1
1
SolderJumper_2_Open
JP2
1
SW_Push
SW1
6
LED
D1, D2, D3, D4, D5, D6
1
C1015
Ferrite_Bead
FB1
10
100NF
100nF
C1, C2, C3, C4, C10, C11, C12, C15 +2
Show 9 more
QtyPartRefs
1
10NF
10nF
C5
3
1UF
1uF
C6, C14, C20
2
4.7UF
4.7uF
C7, C18
2
10PF
10pF
C8, C9
2
22UF
22uF
C13, C17
2
390
R1, R16
8
62K
62k
R2, R6, R7, R8, R9, R10, R11, R12
3
47
R3, R4, R5
5
2k
R13, R14, R15, R17, R18

Overnumpad controller 1xb design files

The KiCad project lives in the purdeaandrei/overnumpad_controller_1xb repository on GitHub; these links point at the commit this page was built from.

Overnumpad controller 1xb: common questions

What microcontroller does the Overnumpad controller 1xb use?

The Overnumpad controller 1xb is built around the STM32F446RETX, from the STM32 family.

How big is the Overnumpad controller 1xb PCB?

The Overnumpad controller 1xb measures 69.6 × 37.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Overnumpad controller 1xb?

65 components, from 29 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 Overnumpad controller 1xb design files?

From the purdeaandrei/overnumpad_controller_1xb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Overnumpad controller 1xb design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which purdeaandrei chose for the repository.

Can I test firmware for the Overnumpad controller 1xb without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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