SMD
About the SMD PCB
SMD is an open source AVR/Arduino PCB design by hulkco, published on GitHub. It is a board measuring 34.7 × 21.5 mm, with 20 components from 14 distinct parts.
Its main chip is the AP2112-3.3, from the AVR/Arduino family. Other key parts include the MCP73831T-2ACI/OT. By type, the board carries 5 connectors, 5 inductors, 3 capacitors, 2 ICs, 2 diodes and 2 resistors.
It belongs with the wearables designs in this gallery.
From the project
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Main components on the SMD
SMD bill of materials (BOM)
20 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AP2112-3.3 ATtiny85-20SU | SOIJ-8_5.3x5.3mm_P1.27mm | U1 |
| 1 | MCP73831T-2ACI/OT LM340MP-5.0/NOPB | SOT-223-3_TabPin2 | U2 |
| 3 | CONN_01X03 | PinSocket_1x03_P2.54mm_Vertical_SMD_Pin1Left | J1, J2, J4 |
| 1 | CONN_02X03 | PinSocket_2x03_P2.54mm_Vertical_SMD | J3 |
| 1 | CONN_01X02 | JST_PH_B2B-PH-SM4-TB_1x02-1MP_P2.00mm_Vertical | J5 |
| 1 | CAPSENSE_CIRCLE | CAPSENSE-CIRCLE2-D10MM | CAP1 |
| 1 | MBRA120 ON | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
| 1 | MBRA140 | D_SMA_Handsoldering | D2 |
| 5 | WS2812B-2020 | WS2812_2020 | L1, L2, L3, L4, L5 |
| 1 | 22nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 1 | 1UF 4.7uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 1 | 4.7uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3 |
| 1 | 100K 1K | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
| 1 | 10K 1K | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R2 |
SMD design files
The KiCad project lives in the hulkco/oshwi repository on GitHub; these links point at the commit this page was built from.
SMD: common questions
What microcontroller does the SMD use?
The SMD is built around the AP2112-3.3, from the AVR/Arduino family.
How big is the SMD PCB?
The SMD measures 34.7 × 21.5 mm and is 1.6 mm thick.
How many components are on the SMD?
20 components, from 14 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 SMD design files?
From the hulkco/oshwi repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the SMD design in my own project?
The repository has no license, so all rights stay with hulkco. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the SMD without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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