Pico numpad

blafr103·pico-numpad·hardware/numpad/numpad.kicad_pcb

About the Pico numpad PCB

Pico numpad is an open source RP2040/RP2350 PCB design by blafr103, published on GitHub under the MIT license. It is a 2-layer board measuring 83 × 127 mm, with 113 components from 43 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the NCP1117-3.3_SOT223, USBLC6-2SC6, W25Q128JVS and 74AHCT1G125. By type, the board carries 36 capacitors, 18 diodes, 17 LEDs, 11 resistors, 5 ICs and 3 connectors.

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

From the project

Hand-wired 17-key USB numpad on Pi Pico W. CircuitPython, diode matrix, event-driven scanning.

Custom two-layer PCB for a 17-key USB numpad with per-key RGB, a rotary encoder, and a 16x2 character LCD. This is the custom-board successor to the hand-wired CircuitPython numpad documented in the repository root, rebuilt around a bare RP2040 with hot-swap switches.

Status - Rev A. Design complete, DRC clean, full design review passed. Boards fabricated by PCBWay (ENIG) and hand-assembled. Electrical bring-up is in progress and incomplete - the board does not yet enumerate over USB and the 3.3 V rail is under investigation. The C firmware targeting this board has been started but is not…

Main components on the Pico numpad

NCP1117-3.3_SOT223 USBLC6-2SC6 RP2040 W25Q128JVS 74AHCT1G125

Pico numpad bill of materials (BOM)

113 components, 43 distinct parts.

Qty	Part	Footprint	Refs
1	NCP1117-3.3_SOT223	SOT-223-3_TabPin2	U1
1	USBLC6-2SC6	SOT-23-6	U2
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U3
1	W25Q128JVS	SOIC-8_5.3x5.3mm_P1.27mm	U4
1	74AHCT1G125	SOT-23-5	U5
2	BSS138	SOT-23	Q1, Q2
1	12MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	USB_C_Receptacle_USB2.0_16P	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1
1	Conn_01x03	PinHeader_1x03_P2.54mm_Vertical	J2
1	Conn_01x04	PinHeader_1x04_P2.54mm_Vertical	J3
1	NUM	SW_MX_HS_CPG151101S11_1u	MX1
1	DIV	SW_MX_HS_CPG151101S11_1u	MX2
1	MULT	SW_MX_HS_CPG151101S11_1u	MX3
1	MIN	SW_MX_HS_CPG151101S11_1u	MX4
1	7	SW_MX_HS_CPG151101S11_1u	MX5
1	8	SW_MX_HS_CPG151101S11_1u	MX6
1	9	SW_MX_HS_CPG151101S11_1u	MX7
1	PLUS	SW_MX_HS_CPG151101S11_1u	MX8
1	4	SW_MX_HS_CPG151101S11_1u	MX9
1	5	SW_MX_HS_CPG151101S11_1u	MX10

Show 23 more

Qty	Part	Footprint	Refs
1	6	SW_MX_HS_CPG151101S11_1u	MX11
1	1	SW_MX_HS_CPG151101S11_1u	MX12
1	2	SW_MX_HS_CPG151101S11_1u	MX13
1	3	SW_MX_HS_CPG151101S11_1u	MX14
1	0	SW_MX_HS_CPG151101S11_1u	MX15
1	PERIOD	SW_MX_HS_CPG151101S11_1u	MX16
1	ENTER	SW_MX_HS_CPG151101S11_1u	MX17
1	BOOTSEL	SW_SPST_PTS645Sx43SMTR92	SW1
1	RESET	SW_SPST_PTS645Sx43SMTR92	SW2
1	RotaryEncoder_Switch	RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	SW3
17	MX_SK6812MINI-E	LED_MX_6028R	LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +9
18	1N4148W	D_SOD-123	D1, D2, D3, D4, D5, D6, D7, D8 +10
2	10u	C_0805_2012Metric	C1, C2
3	1u	C_0603_1608Metric	C3, C5, C11
27	100n	C_0603_1608Metric	C4, C6, C7, C8, C9, C10, C12, C13 +19
2	27p	C_0603_1608Metric	C15, C16
2	22u	C_0805_2012Metric	C35, C36
2	5k1	R_0603_1608Metric	R1, R2
2	10k	R_0603_1608Metric	R3, R4
2	1k	R_0603_1608Metric	R5, R8
2	27	R_0603_1608Metric	R6, R7
1	470	R_0603_1608Metric	R9
2	4k7	R_0603_1608Metric	R10, R11

Pico numpad design files

The KiCad project lives in the blafr103/pico-numpad repository on GitHub; these links point at the commit this page was built from.

Layouthardware/numpad/numpad.kicad_pcb
Schematichardware/numpad/numpad.kicad_sch

Pico numpad: common questions

What microcontroller does the Pico numpad use?

The Pico numpad is built around the RP2040, from the RP2040/RP2350 family.

How big is the Pico numpad PCB?

The Pico numpad measures 83 × 127 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico numpad?

113 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pico numpad design files?

From the blafr103/pico-numpad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Pico numpad design in my own project?

Yes, under the terms of its MIT license, which blafr103 chose for the repository.

Can I test firmware for the Pico numpad 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.