4 layers85 × 50 mm
2 layers33 × 18.7 mm
ProtoCentral easyISO isolated Qwiic adapter — hardware design files (CERN-OHL-P v2)
- Size
- 33 × 18.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 9
- Pads
- 62
- Tracks, vias
- 75, 14
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Oct 2026
- Updated
- 6 Oct 2026
Overview
EasyISO is an open-source printed circuit board by Protocentral, from the Protocentral/protocentral_easyiso_hardware repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 33 × 18.7 mm with 25 parts on 9 nets, routed with 75 tracks and 14 vias.
It is built around the MIE1W0505BGLVH-3R-Z and ISO1640BD. Its parts include 6 capacitors, 5 resistors, 4 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
Main components
2README
README.mdProtoCentral easyISO — Isolated Qwiic Adapter
easyISO galvanically isolates a Qwiic / STEMMA QT I²C link — data and power — so a body-connected sensor never shares a ground with a mains-powered computer.
- I²C isolator: TI ISO1640 (8-pin SOIC), bidirectional SDA/SCL, hot-swappable, up to 1.7 MHz
- Isolated power: MPS MIE1W0505BGLVH isolated DC-DC module, 3.3 V out (about 75 mA)
- Connectors: one Qwiic port and one 0.1" 4-pin header (SCL, SDA, VCC, GND) on each side
- Pull-ups: 10 kΩ on SDA and SCL, on both sides
- Board: 33 × 18.7 mm, 2-layer, 4 × M2 mounting holes
The voltage ratings above are the manufacturers' component ratings. easyISO is a development tool, not a certified medical isolation barrier.
Repository contents
- /hardware — KiCad project (
easyISO.kicad_pro,.kicad_sch,.kicad_pcb) and the schematic PDF (pc_easyiso_v1_schematic.pdf)
Revisions
| Revision | Date | Notes |
|---|---|---|
| v1 | 2026-08 | First release |
License Information
Hardware
All hardware is released under the CERN-OHL-P v2 license.
This source describes Open Hardware and is licensed under the CERN-OHL-P v2.
You may redistribute and modify this documentation and make products using it under the terms of the CERN-OHL-P v2 (https://cern.ch/cern-ohl). This documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN-OHL-P v2 for applicable conditions.
Documentation
All documentation is released under Creative Commons Share-alike 4.0 International.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5 |
| 4 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C4, C5 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 2 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2, J5 |
| 2 | LOGO | SparkFun-Aesthetic:qwiic_4mm | G***, G*** |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | Qwiic_RA | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3, J4 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 22u | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | ISO1640 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | MIE1W0505BGLVH-3R-Z | kicad_protocentral_footprints:CONV_MIE1W0505BGLVH-3R-Z | PS1 |
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Questions
How big is the EasyISO PCB?
It measures 33 × 18.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the EasyISO use?
25 parts, built around the MIE1W0505BGLVH-3R-Z and ISO1640BD. 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 EasyISO KiCad files?
From the Protocentral/protocentral_easyiso_hardware repository on GitHub, at the commit this page was made from: the board is hardware/easyISO.kicad_pcb and its schematic hardware/easyISO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the EasyISO design in my own project?
Its repository publishes it under the CERN-OHL-P-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).