4 layers149 × 95 mm
2 layers50.9 × 19.6 mm
Smart 7 segment
dwillmore/smart_7segSmart 7 segment display driver board
- Size
- 50.9 × 19.6 mm
- Copper layers
- 2
- Thickness
- 0.89 mm
- Parts
- 10
- Nets
- 24
- Pads
- 76
- Tracks, vias
- 338, 144
- Pours
- 127
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Nov 2024
- Updated
- 11 Nov 2024
Overview
Smart 7 segment is an open-source printed circuit board by dwillmore, from the dwillmore/smart_7seg repository on GitHub, published under the MIT licence. It is a 2-layer board of 50.9 × 19.6 mm with 10 parts on 24 nets, routed with 338 tracks and 144 vias.
It is built around the AO3400A. Its parts include 4 transistors, 3 ICs, 2 connectors and 1 capacitor. It belongs with the lEDs and displays boards and the RISC-V boards of this library.
Main components
1README
README.mdsmart_7seg
Smart 7 segment display driver board
This board carries two 2 digit 7 segment displays and multiplexes them to display up to four characters. Input is serial ASCII at 115200 baud. The board will display the first four characters it sees after a newline or carrage return. It will then pass through any remaining characters until the next carrage return or newline. This allows boards to be cascaded from left to right to add more digits to the display in a manner that is invisible to the user.
The board is based off of the WCH CH32V003 chip in a TSSOP20 pin package. It has an 0604 1uF capacitor as a decoupling cap and four AO3416 mosfets for the digit drivers. It is designed to run at 3.3V and works with standard red and green displays. It may also work with modern GaN displays, but that has not been tested.
The boards were fabricated by JLCPCB and designed with KiCAD 8.0.
Schematic:
Front Copper:
Back Copper:
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4 |
| 2 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J1, J2 |
| 2 | DC56-11CGKWA | Display_7Segment:DA56-11CGKWA | U2, U3 |
| 1 | C | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | CH32V003FxPx | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
Questions
How big is the Smart 7 segment PCB?
It measures 50.9 × 19.6 mm and has 2 copper layers, 0.89 mm thick.
What parts does the Smart 7 segment use?
10 parts, built around the AO3400A. 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 Smart 7 segment KiCad files?
From the dwillmore/smart_7seg repository on GitHub, at the commit this page was made from: the board is board/Smart 7 segment.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Smart 7 segment design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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