2 layers38.1 × 52.2 mm
Ledusbc2key
yerriad/pcb-design
personal pcb learning. if i have time, i'll add resources to help you
24 parts
2 layers76.2 × 107.3 mm
Numpad
yerriad/pcb-designpersonal pcb learning. if i have time, i'll add resources to help you
- Size
- 76.2 × 107.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 53
- Pads
- 287
- Tracks, vias
- 303, 17
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 6 Sep 2022
- Updated
- 15 Oct 2022
Overview
Numpad is an open-source printed circuit board by yerriad, from the yerriad/pcb-design repository on GitHub. It is a 2-layer board of 76.2 × 107.3 mm with 55 parts on 53 nets, routed with 303 tracks and 17 vias.
It is built around the ATMEGA32U2-AU and PRTR5V0U2X. Its parts include 21 switches, 17 diodes, 6 capacitors, 6 resistors and 2 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U2-AU
TQFP-32(7x7)-40℃~+85℃ 16MHz 1KB 1KB 2.7V~5.5V 22 32KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Programmable watchdog TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontroller Units (MCUs/MPUs/SOCs)
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
README.mdpcb-design
personal pcb learning. if i have time, i'll add resources to help you
i am following ai03's guide to pcbs. i'll see how i'm do with that for the next while.
components required
all of these needs to be surface mount hand soldierable. i'll try to find them from the same company (mouser or jaycar) but amazon is pretty good. all of these don't include shipping.
| Component Name | Place(s) to purchase from | Price/part (lowest amount available) |
|---|---|---|
| ATMEGA32u2-AR | mouser, theres some wait | NZ$6.43 for one |
| Kailh Hotswap Sockets | aliexpress and | aliexpress: NZ$0.469 each for 30pcs, amazon: NZ$0.248 each for 50pcs |
| WS2812B | amazon | $1.798 for 1m |
| TSX-3225 | mouser | specific part not found using footprint, but varies from NZ$0.709 - 1.400 each |
| Resistors | jaycar, metal film and carbon film are available | NZ$1 each for most, if not usually cheaper |
| 1N4148W-TP (not needed for 2k or 3k) | mouser, has not been checked yet, just has the same name as the footprint i used | NZ$0.321 for one |
| TL3342F160QG | mouser same as above | NZ$1.03 for one |
| Molex 216990-0003 | mouser same as above | NZ$1.43 for one |
Resistors and diodes used
ledusbc2key
numpad
PCB statistics report
Auto generated by KiCad
Board
- Width: 43.8150 mm
- Height: 54.2925 mm
- Area: 2273.5889 sq. mm
Pads
- Through hole: 4
- SMD: 98
- Connector: 0
- NPTH: 16
Vias
- Through vias: 17
- Blind/buried: 0
- Micro vias: 0
Components
| Front Side | Back Side | Total | |
|---|---|---|---|
| THT: | 0 | 0 | 0 |
| SMD: | 2 | 22 | 24 |
| Total: | 2 | 22 | 24 |
Drill holes
| Count | Shape | X Size | Y Size | Plated | Via/Pad | Start Layer | Stop Layer |
|---|---|---|---|---|---|---|---|
| 17 | Round | 0.4000 mm | 0.4000 mm | PTH | Via | F.Cu | B.Cu |
| 4 | Round | 1.7500 mm | 1.7500 mm | NPTH | Pad | F.Cu | B.Cu |
| 4 | Round | 3.0000 mm | 3.0000 mm | NPTH | Pad | F.Cu | B.Cu |
| 4 | Round | 2.1000 mm | 2.1000 mm | NPTH | Pad | F.Cu | B.Cu |
| 2 | Round | 3.9878 mm | 3.9878 mm | NPTH | Pad | F.Cu | B.Cu |
| 2 | Round | 0.6500 mm | 0.6500 mm | NPTH | Pad | F.Cu | B.Cu |
| 2 | Slot | 0.6000 mm | 1.2000 mm | PTH | Pad | F.Cu | B.Cu |
| 2 | Slot | 0.6000 mm | 1.7000 mm | PTH | Pad | F.Cu | B.Cu |
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | D_Small | Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 17 | MX_SW_HS | marbastlib-mx:SW_MX_HS_1u | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 +1 |
| 3 | MX_stab | marbastlib-mx:STAB_MX_2u | S1, S2, S3 |
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R6 |
| 2 | 14pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R5 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | ATmega32U2-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | Crystal_GND24_Small | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | HRO-TYPE-C-31-M-12 | Type-C:HRO-TYPE-C-31-M-12-HandSoldering | USB1 |
| 1 | PRTR5V0U2X | random-keyboard-parts:SOT143B | U2 |
| 1 | Polyfuse_Small | Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 1 | SW_Push | random-keyboard-parts:SKQGADE010 | SW18 |
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Questions
How big is the Numpad PCB?
It measures 76.2 × 107.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Numpad use?
55 parts, built around the ATMEGA32U2-AU and PRTR5V0U2X. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Numpad KiCad files?
From the yerriad/pcb-design repository on GitHub, at the commit this page was made from: the board is numpad/numpad.kicad_pcb and its schematic ledusbc2key/ledusbc2key.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Numpad design in my own project?
Its repository states no licence, so its author keeps all rights: ask yerriad before reusing the design.