https://github.com/basilfx/dsmr-splitter

Active port expander for the P1 port on a Dutch Smart Meter (DSMR).
https://github.com/basilfx/dsmr-splitter

dsmr kicad p1 pcb port-expander port-splitter riot-os

Last synced: 3 months ago
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Active port expander for the P1 port on a Dutch Smart Meter (DSMR).

• Host: GitHub
• URL: https://github.com/basilfx/dsmr-splitter
• Owner: basilfx
• License: other
• Created: 2021-09-05T22:13:00.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2022-10-04T21:13:12.000Z (over 3 years ago)
• Last Synced: 2025-01-14T01:14:38.449Z (over 1 year ago)
• Topics: dsmr, kicad, p1, pcb, port-expander, port-splitter, riot-os
• Language: HTML
• Homepage:
• Size: 6.63 MB
• Stars: 3
• Watchers: 4
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

          
# DSMR Splitter

Active port expander for the P1 port on a Dutch Smart Meter (DSMR).

## Introduction

This is an active port expander for DSMR 5.0. Contrary to simple splitting

cables, this exapander buffers telegrams, and provides a dedicated port to

connected devices.

[](docs/Pictures/Photo1.jpeg)

[](docs/Pictures/Photo3.jpeg)

[](docs/Pictures/Photo5.jpeg)

### Advantages

This design solves two (potential) issues compared to other splitters:

* Some port splitters have a primary and a secondary port. Only the primary

  port has the data-request line connected to the DSMR. This means that the

  secondary port cannot request telegrams on its own and depends on the device

  connected to the master port.

* A device connected to the secondary port could receive out-of-sync, if it

  depends on the data-request line. This could lead to incomplete/corrupt

  telegrams.

See [this](docs/Problem-statement.md) for more information.

## Features

* 3-port splitter.

* DSMR 5.0.

* No external power supply needed.

The splitter provides galvanic isolation between ports, if the 5 V is not used.

To read more on how this was achieved, see [this](docs/Isolation.md).

Furthemore, it requires a DSMR 5.0 meter because it provides 5 V power. Do note

that the power (5 V, 250 mA) provided by the DSMR has to be shared among all

readers, and the splitter itself requires ~50 mA.

Older DSMR versions can be supported by changing the firmware and providing 5 V

externally.

## Contents

* The `3d/` folder contains a 3D-printable design for an enclosure.

* The `firmware/` folder contains the RIOT-OS firmware used for the

  microcontroller.

* The `pcb/` folder contains the Kicad schema and board design.

* The `tools/` folder contains additional tools, such as a DSMR simulator.

## License

The work in this repository is covered by CC BY-NC-SA 4.0. See the `LICENSE.md`

file for more information.