Optical keyboard mx

girishji·optical-keyboard-mx-old

Optical keyboard mx PCB layout, top view — open source board by girishji

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About the Optical keyboard mx PCB

Optical keyboard mx is an open source PCB design by girishji, published on GitHub under the MIT license. It is a 2-layer board measuring 324.8 × 186 mm, with 413 components from 14 distinct parts.

Other key parts include the BlackPill_STLINK and IS31FL3731-QF. By type, the board carries 74 modules, 74 transistors, 74 switches, 74 diodes, 6 resistors and 5 capacitors.

It belongs with the keyboards designs in this gallery.

From the project

Optical keyboard PCB based on Gateron MX optical switches (KiCad project)

Optical keyboard PCB based on Gateron MX optical switches (KiCad project).

Keyboard matrix uses column-to-row scanning approach. The IR (infra-red) led's in each column is connected to a GPIO pin configured as output. A column is powered by setting the pin HIGH. Each row is connected to a GPIO pin configured as input so that voltage drop across the load register of PT (Phototransistor) can be read.

Optical keyboard mx, from the project README — From the project README

Main components on the Optical keyboard mx

BlackPill_STLINK IS31FL3731-QF

Optical keyboard mx bill of materials (BOM)

413 components, 14 distinct parts.

Qty	Part	Footprint	Refs
1	BlackPill_STLINK	BlackPill_STLINK_Down	U1
1	IS31FL3731-QF	QFN-28-1EP_4x4mm_P0.4mm_EP2.3x2.3mm	U2
74	LED	D_0603_1608Metric	M1, M2, M3, M4, M5, M6, M7, M8 +66
74	Q_Photo_NPN	Everlight_PT_PT12-21C_TR8	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +66
17	MountingHoleStdoffM2	SMTSO_M2	H1, H2, H3, H4, H5, H6, H7, H8 +9
8	MountingHoleSprt	SMTSO_M2	HS1, HS2, HS3, HS4, HS5, HS6, HS7, HS8
74	560R	R_0603_1608Metric	RL1, RL2, RL3, RL4, RL5, RL6, RL7, RL8 +66
5	6.8k	R_0805_2012Metric	RP1, RP2, RP3, RP4, RP5
74	Gateron_Optical	Gateron_Sw_1u	S1, S2, S3, S4, S5, S6, S7, S8 +66
74	IR_LED	Everlight_IR_IR12-21C_TR8	D1, D2, D3, D4, D5, D6, D7, D8 +66
2	C_tant	C_1206_3216Metric	C1, C2
2	C_filt	C_0603_1608Metric	C3, C5
1	C_aud_filt	C_0603_1608Metric	C4
6	R_a	R_0603_1608Metric	R1, R2, R3, R4, R5, R6

Optical keyboard mx design files

The KiCad project lives in the girishji/optical-keyboard-mx-old repository on GitHub; these links point at the commit this page was built from.

Layoutoptical-keyboard-mx.kicad_pcb
Schematicoptical-keyboard-mx.kicad_sch

Optical keyboard mx: common questions

How big is the Optical keyboard mx PCB?

The Optical keyboard mx measures 324.8 × 186 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Optical keyboard mx?

413 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Optical keyboard mx design files?

From the girishji/optical-keyboard-mx-old repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Optical keyboard mx design in my own project?

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

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