ChapPad

CHAPARII·ChapPad·PCB/chappad.kicad_pcb

About the ChapPad PCB

ChapPad is an open source RP2040/RP2350 PCB design by CHAPARII, published on GitHub. It is a 2-layer board measuring 95.8 × 85.5 mm, with 26 components from 5 distinct parts.

Its main chip is the XIAO-RP2040-DIP, from the RP2040/RP2350 family. By type, the board carries 12 switches, 12 diodes, 1 IC and 1 connector.

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

From the project

This hackpad have 11keys and 1 rotary encoder, I've used XIAO RP2040 microcontroller in this and a 0.9'' OLED Display. I've done the BOM and made it from one supplier "Amazon" to make clean or else it could become messy. I've some keys in my home as well (1-2 keys) which I'll use in if it's needed. :b For the CAD I made it in two parts "top" and "bottom". I also thought to make a top plate but that would look over artificial and I wanted my Hackpad to look like "YES!! This is coustom hackpad, which I made by myself". I'll order the PCB in red or blue color because will match with my setup…

Main components on the ChapPad

XIAO-RP2040-DIP

ChapPad bill of materials (BOM)

26 components, 5 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	XIAO-RP2040-DIP	XIAO-RP2040-DIP	U1
1	OLED_128X32 OLED_128x32	OLED_128x32	J1
11	SW_PUSH_45DEG SW_Push_45deg	MX_PCB_1.00u	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +3
1	RotaryEncoder_Switch_MP	Encoder_EC11_MX	SW12
12	1N4148	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D3, D4, D5, D6, D7, D8 +4

ChapPad design files

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

ChapPad: common questions

What microcontroller does the ChapPad use?

The ChapPad is built around the XIAO-RP2040-DIP, from the RP2040/RP2350 family.

How big is the ChapPad PCB?

The ChapPad measures 95.8 × 85.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ChapPad?

26 components, from 5 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 ChapPad design files?

From the CHAPARII/ChapPad 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 ChapPad design in my own project?

The repository has no license, so all rights stay with CHAPARII. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the ChapPad 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.