EC Pro2 Controller Normal

4pplet·EC-Pro-2·PCB/Controllers/EC_Pro2_Controller_Normal/EC_Pro2_Controller_Normal.kicad_pcb

EC Pro2 Controller Normal PCB layout, top view — open source board by 4pplet

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About the EC Pro2 Controller Normal PCB

EC Pro2 Controller Normal is an open source PCB design by 4pplet, published on GitHub under the MIT license. It is a 2-layer board measuring 141.5 × 36 mm, with 48 components from 17 distinct parts.

Other key parts include the MIC2026-2BM, SRV05-4 and FE1.1. By type, the board carries 22 capacitors, 12 resistors, 5 ICs, 3 connectors, 3 inductors and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Open source replacement PCB kit for the HHKB Pro 2 keyboard.

Open source HHKB Pro2 Controller and mainboard.

This project is a continuation of my development of open source EC boards.

The supported layout options are the following:

- Layout size: HHKB Pro2 ANSI and some additions - Compatible switches: EC switches (Topre and NIZ) - Microcontroller: STM32F401 - Connector: JST connector for controller board - Firmware compatibility: QMK (with VIA/VIAL support) - Protection hardware (present on both the mainboard and both controller versions): - Fused - ESD protection

EC Pro2 Controller Normal, from the project README — From the project README

Main components on the EC Pro2 Controller Normal

MIC2026-2BM SRV05-4 FE1.1

EC Pro2 Controller Normal bill of materials (BOM)

48 components, 17 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	MIC2026-2BM	SOIC-8_3.9x4.9mm_P1.27mm	U1
3	SRV05-4	SOT-23-6-routable	U2, U3, U4
1	FE1.1	LQFP-48_7x7mm_P0.5mm	U5
1	12MHZ 12MHz	Crystal_SMD_3225-4pin_3.2x2.5mm	Y1
1	C145956 JST	JST-SR-4	J1
2	C718022 USB_A	USB-SMT-04F-S1-B1-R9A	J2, J3
1	500MA 500mA	Fuse_1206_3216Metric	F1
1	HRO-TYPE-C-31-M-12	HRO-TYPE-C-31-M-12-Assembly	USB1
3	C85832 220 @ 100MHz, 2A	L_0603_1608Metric	L1, L2, L3
13	100N 100n	C_0603_1608Metric	C1, C2, C5, C10, C11, C12, C16, C17 +5
4	10U 10u	C_0603_1608Metric	C3, C6, C14, C15
2	100U 100u	CP_Elec_6.3x5.9	C4, C7
2	30P 30p	C_0603_1608Metric	C8, C9
1	1u	C_0603_1608Metric	C13
2	5.1K 5.1k	R_0402_1005Metric	R1, R2
9	10K 10k	R_0603_1608Metric	R3, R4, R5, R6, R7, R8, R9, R10 +1
1	2.7K	R_0603_1608Metric	R12

EC Pro2 Controller Normal design files

The KiCad project lives in the 4pplet/EC-Pro-2 repository on GitHub; these links point at the commit this page was built from.

EC Pro2 Controller Normal: common questions

How big is the EC Pro2 Controller Normal PCB?

The EC Pro2 Controller Normal measures 141.5 × 36 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EC Pro2 Controller Normal?

48 components, from 17 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 EC Pro2 Controller Normal design files?

From the 4pplet/EC-Pro-2 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 EC Pro2 Controller Normal design in my own project?

Yes, under the terms of its MIT license, which 4pplet chose for the repository.

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