Hydra 83

BuzzL123·Hydra_83·PCB/kicad/Hydra83.kicad_pcb

About the Hydra 83 PCB

Hydra 83 is an open source RP2040/RP2350 PCB design by BuzzL123, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 357.2 × 106.1 mm, with 211 components from 26 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the XC6206PXXXMR, SRV05-4 and W25Q128JVS. By type, the board carries 83 diodes, 16 capacitors, 13 resistors, 5 ICs, 4 connectors and 3 switches.

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

From the project

An 83% Keyboard with PS/2 functionalitly

The Hydra 83 is a custom 83-key mechanical keyboard that can switch between USB HID and PS/2 via a hardware toggle. The name comes from two things:

- 83 — the total key count - Hydra — the multi-headed creature of myth, representing the board's ability to switch between protocols. In PS/2 mode it's a standard PS/2 keyboard; in USB mode it's a USB keyboard that also accepts a PS/2 mouse on the PS/2 connector

Main components on the Hydra 83

XC6206PXXXMR SRV05-4 RP2040 W25Q128JVS

Hydra 83 bill of materials (BOM)

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

Qty	Part	Footprint	Refs
1	XC6206PXXXMR XC6206PxxxMR	SOT-23-3	U1
2	SRV05-4	SOT-23-6-routable	U2, U6
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm_ThermalVias	U3
1	W25Q128JVS	SOIC-8_5.3x5.3mm_P1.27mm	U4
2	BSS138	SOT-23	Q1, Q2
1	12MHZ 12MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	USB_C_RECEPTACLE_USB2.0_16P USB_C_Receptacle_USB2.0_16P	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J2
1	SSD1306	SSD1306-0.91-OLED-4pin-128x32	J3
1	Debug	PinHeader_1x05_P2.54mm_Vertical	J4
1	MINI-DIN_6PINS Mini-DIN_6pins	Connector_Mini-DIN_Female_6Pin_2rows	P1
1	C83798 Fuse_Small	Fuse_1206_3216Metric	F1
80	MX_SW_solder	SW_MX_1u	MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +72
1	RotaryEncoder_Switch	RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	MX16
2	MX_SW_solder	SW_MX_1.75u	MX72, MX77
1	C318884 BOOTSEL	SW_SPST_TL3342	SW1
1	C318884 RST	SW_SPST_TL3342	SW2
1	C221530 Mode Sel	SW_Slide_SPDT_Angled_CK_OS102011MA1Q	SW3
83	C83528 D_Small	D_SOD-123	D1, D2, D3, D4, D5, D6, D7, D8 +75
9	100N 100n	C_0402_1005Metric	C1, C2, C4, C5, C6, C7, C8, C9 +1
4	1u	C_0402_1005Metric	C3, C10, C12, C13

Show 6 more

Qty	Part	Footprint	Refs
1	10U 10u	C_0603_1608Metric	C11
2	22P 22p	C_0402_1005Metric	C14, C15
8	5K1 5k1	R_0402_1005Metric	R1, R2, R7, R8, R9, R10, R12, R13
2	27	R_0402_1005Metric	R3, R4
1	5.1K 5.1k	R_0402_1005Metric	R5
2	1k	R_0402_1005Metric	R6, R11

Hydra 83 design files

The KiCad project lives in the BuzzL123/Hydra_83 repository on GitHub; these links point at the commit this page was built from.

Hydra 83: common questions

What microcontroller does the Hydra 83 use?

The Hydra 83 is built around the RP2040, from the RP2040/RP2350 family.

How big is the Hydra 83 PCB?

The Hydra 83 measures 357.2 × 106.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hydra 83?

211 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 Hydra 83 design files?

From the BuzzL123/Hydra_83 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 Hydra 83 design in my own project?

Yes, under the terms of its GPL-2.0 license, which BuzzL123 chose for the repository.

Can I test firmware for the Hydra 83 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.