Mikrobus riser

OpenSuperRF: the ISNO Super radio board, open

(Version française : README.fr.md)

OpenSuperRF is the open design of the ISNO Super: a sub-GHz radio board built around an ESP32-S3, made to cleanly run open radio firmwares such as OpenProfalux (Profalux 868 MHz shutters in Home Assistant, no gateway).

This is the v1.0 (EVT), the version that was manufactured, assembled and measured. It is published here as open hardware. The board sold as a pre-order is the v1.1, a refinement (see v1.0 open, v1.1 sold).

⚠️ Open points (v1.0 EVT). This prototype has known open points, including a J2 mikroBUS pinout that is destructive with a straight IDC cable. Read KNOWN_ISSUES.md before building.

What it is

• ESP32-S3 over USB-C, powered by a 3.3 V LDO.
• Two CC1101 radios, 433 MHz and 868 MHz, driven over SPI.
• On the v1.0, the two radios are combined onto a single SMA through an LC diplexer.
• Qwiic (I2C) and mikroBUS (2x8) for expansion.
• BOOT and RESET buttons, status LED.
• 4 layers, 67 x 55 mm. Board marking: ISNO Super IoT HW REV 1.0.

Firmwares

The Super is not tied to one firmware, it is a board for radio firmwares. It notably runs:

• OpenProfalux : Profalux 868 MHz shutters in Home Assistant, no gateway.
• OpenRFTest : radio test firmware (TX/RX).

RF measurements (v1.0, tinySA)

The v1.0 was measured: single, clean carriers, low noise floor, no spurious emissions over the observed window.

Schematic and pinout

mikroBUS (left column): AN 8, RST 40, CS 34, SCK 36, MISO 37, MOSI 35, 3.3 V, GND. mikroBUS (right column): PWM 38, INT 39, RX 18, TX 17, SCL 13, SDA 12, 5 V, GND. Qwiic: GND, 3.3 V, SDA 12, SCL 13.

The full schematic is in docs/isno-super-v1.0-schematic.pdf.

Enclosure

A 3D-printable enclosure is provided in enclosures/ (boitier_super.stl). The board also fits DIN-rail and IP65 enclosures.

Accessories

Open here as well (produced, unchanged since). KiCad sources in hardware/accessories/.

• mikroBUS riser: raises and offsets the mikroBUS socket.
• mikroBUS adapter.

v1.0 open, v1.1 sold

To be clear, and honest:

• v1.0 (here, open): the two radios combined onto a single SMA through an LC diplexer. This is the tested and measured version, published as open hardware to study, build and modify.
• v1.1 (sold as a pre-order): same radio chain (ESP32-S3 + dual CC1101), but the diplexer is removed in favour of two dedicated antenna connectors (one per band). It is the refined, ready-to-use and supported evolution.

DIY therefore stays fully possible and free; the v1.1 is the "ready and reliable" option for those who would rather not build it.

Repository contents

• hardware/super/ : KiCad source of the Super v1.0 (schematic + PCB).
• hardware/accessories/ : KiCad source of the accessories (mikroBUS riser, adapter).
• hardware/OpenProfalux.pretty/, hardware/lib/ : custom footprints and symbols needed to open the project in KiCad. The .pretty library keeps its historical name (the board started under the OpenProfalux project); it is just the footprint library.
• fab/ : the manufactured EVT outputs (Gerbers, BOM, CPL, 3D render, EMC and thermal reports).
• enclosures/ : 3D-printable enclosure.
• docs/ : schematic PDF, BOM, production notes.
• images/ : photos, RF measurements, renders.

Licence

Hardware: CERN-OHL-S v2 (see LICENSE). Associated firmwares: see their own repos.

Links

• Ready-to-use board (v1.1): https://www.isno.fr/boutique/isno-super
• Project article (context, measurements, design choices): https://www.isno.fr/projets/isno-super
• Profalux shutters firmware: https://github.com/Isno-Open/OpenProfalux