2 layers98 × 68 mm
Rpi1-adapter
noisebridge/rfid-access-control
Little system to handle RFID access control at Noisebridge
53 parts47GPL-2.0
2 layers70 × 30 mm
Multi interface
noisebridge/rfid-access-control47Little system to handle RFID access control at Noisebridge
- Size
- 70 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 31
- Pads
- 104
- Tracks, vias
- 220, 11
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 2 Aug 2014
- Updated
- 15 Feb 2023
Overview
Multi interface is an open-source printed circuit board by noisebridge, from the noisebridge/rfid-access-control repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 70 × 30 mm with 24 parts on 31 nets, routed with 220 tracks and 11 vias.
It is built around the SP3232EEN and RJ45. Its parts include 11 capacitors, 11 connectors and 2 ICs. It belongs with the interfaces and adapters boards of this library.
Main components
2README
hardware/multi-interface/README.mdMulti serial line driver RJ45
Features
- 4 interfaces with RJ45 plugs (uses a combined 4-block of RJ45 I found in an old switch. Standard distance would need to pull these apart 50 thou/mil)
- TTL compatible with 3.3V, so can interface with Rasberry Pi or Beaglebone Black.
- Creates RS232 line voltages from a single 3.3V supply.
- Uses a SP3232E, essentially a MAX232 compatible chip for 3.3V supply voltage and only 100nF capcitors needed.
- Allows to power external terminals on Line 7 and 8 (see
../terminalfor details) - FYI M3 mounting holes are 18mmx64mm apart.
TODO
Learnings from first board, possibly add to second revision
- It would be useful to have a four line voltage/ground connector, directly compatible with the corresponding 4-pin connector on the terminal side.
- Silk-screen marking RX/TX
- 3-Pin connector for 12v: [GND-12v-GND] to allow turn-agnostic plug.
- Possibe protection circuit: reverse polarity protection diode; PTC fuse
- optional 12V power LED ? Maybe optional 3.3V power LED
- RX/TX LEDs. Check connection of RJ45 plugs, some have built-in LEDs (usually to indicate Ethernet 100Mbps/1Gbps), would be cool to re-use these. Also optional space for discrete diodes.
- All LEDs: also provide pads on the bottom of the board if that is the part visible.
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | C | SMD_Packages:SMD-0805 | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 |
| 4 | CONN_1 | Connect:1pin | P4, P5, P6, P7 |
| 4 | RJ45 | Connect:RJ45_8 | J1, J2, J3, J4 |
| 2 | CONN_2 | Connect:SIL-2 | P2, P3 |
| 2 | SP3232E | SMD_Packages:TSSOP-16 | U1, U2 |
| 1 | CONN_4X2 | Pin_Headers:Pin_Header_Straight_2x04 | P1 |
| 1 | CP | Capacitors_Elko_ThroughHole:Elko_vert_DM6-3_RM2-5 | C11 |
Questions
How big is the Multi interface PCB?
It measures 70 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Multi interface use?
24 parts, built around the SP3232EEN and RJ45. 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 Multi interface KiCad files?
From the noisebridge/rfid-access-control repository on GitHub, at the commit this page was made from: the board is hardware/multi-interface/multi-interface.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Multi interface design in my own project?
Its repository publishes it under the GPL-2.0 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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