What is Node-Red?

Node-Red is a visualized programming environment that comes from the IoT area. It is primarily used to connect sensor hardware and the corresponding data visualization. Node-Red consists of so-called nodes, which are connected to one another using rubber band technology and thus determine the flow of data.

What do sailors get out of it?

Node-Red offers nodes to read sensors, to process NMEA-0183 data via serial interfaces or to read and process SignalK data streams.… Continue reading

AIS data exchange

ship spotting

Popular services like or do rely on numerous AIS station around the world.
Volunteers are collecting AIS-data within reach of their receivers and pass them to the servers. There are still areas, not yet covered!
A receiving station can be set up inexpensively: Internet connection, RaspberryPI, DVB-T stick and an old TV antenna on the roof are sufficient.… Continue reading

Open workshops

Shared economy

Don't have your own machines and tools? No handicraft basement? Or just looking for like-minded people?
The so-called maker scene has been booming for several years. Open workshops, FabLabs, MakerSpaces, HackerSpaces, hands-on and self-help workshops and repair cafes are being built in many cities. All with the aim of sharing expensive machines and tools, exchanging experiences, and using resources efficiently.
Modern 3D printers, CNC milling machines, laser cutters, soldering stations and know-how are often available.… Continue reading

Marine Control Server


GeDaD MCS // Marine Control Server


The MCS is an interface module for marine applications. With its six serial interfaces (NMEA0183 compatible), its CAN interface (NMEA2000 compatible), its 1-wire interface and its I2C interface, it offers ideal integration options in all systems. A Raspberry Pi is used as the brain of the system, via which all data can be processed. Ready-made programs for “Openplotter” and “Signal K” are available for the system, so that integration and data processing becomes child's play.

... Continue reading

NMEA2000 and ESP32

First of all, a few important notes that you should definitely pay attention to.

NMEA2000 is increasingly replacing NMEA0183 as the standard. Unfortunately, NMEA2000 is a very complex protocol and for a long time it was hardly possible to realize your own projects. That has changed with the NMEA2000 library by Timo Lappalainen (

The library supports different microcontrollers, including the ESP32. The ESP32 from Espressiv is very powerful and, thanks to the WLAN and CAN bus interface, is ideal for your own projects.… Continue reading

LiPoFe4 batteries imported from China

Link to the manufacturer

Link to the product

Data sheet BMS

Lifepo4 Battery Instruction

Worth knowing (German translation)

  • Cheap LiFePo4 batteries imported from China
  • Well-known Chinese manufacturer Bejing XD Batteries with experience in battery construction since 2006
  • 60% Savings compared to products from German retailers
  • CE, UL, ISO9001, RohS certification
  • 5 year guarantee from the Chinese manufacturer
  • By default, a waterproof BMS with 100A is installed at 12V, peak load 300A (+ 50A / 3sec),
    At 24V and 48V standard BMS 150A (peak 450A)
  • higher output possible
  • Up to 4 batteries can be connected and charged in parallel
  • Series connection is not possible (then use the appropriate battery type with a higher voltage)
  • Consists of prismatic cells from Chinese manufacturers
  • Closed, waterproof housing
  • Batteries with flat terminals (screw-on round terminals can be ordered)
  • The configuration of the batteries is variable
    • 12V 100Ah: 326 X 170 X 220 14kg
    • 12V 200Ah: 521 X 238 X 218 22kg
    • 24V 100Ah: 528 X 238 X 218 23kg
    • 24V 200Ah: 483 X 430 X 227 45kg
    • 48V 100Ah: 483 X 225 X 383 46kg
    • 48V 200Ah: 450 X 320 X 250 90kg
  • There were quality problems with some batteries regarding:
    • Incorrect installation position of the cells
    • Fixation of the charging electronics with adhesive tape
    • Space wasted due to oversized housing with foam filling
    • Soldered power cables instead of connections with compression sleeves
    • Loose compression sleeves on power cables
    • Uneven cell charge level on delivery
    • Incorrect display of the battery capacity in the app
    • Sale of user batteries with 1000 charge cycles according to the app
  • Also available with Bluetooth for displaying voltage, current and capacity via an iPhone or Android app (Liontron LX Smart BMS)
    • The Android app is very rudimentary and can do no more than shown in the picture
    • A lot more is possible with the iPhone app


Android app from Liontron


iPhone app

Pictures of the inside of the battery.… Continue reading

DIY boat automation

  • Use of components from home automation
  • Connection via WLAN
  • Operation via web browser with mobile phone or tablet
  • Design of your own operating pages with HTML code using predefined widgets and CSS
  • Free configuration of symbols and names via configuration file
  • No JavaScript programming necessary
  • Special open source firmware required for control units (Tasmota)
  • No cloud connection necessary
  • Devices are controlled directly with HTTP commands
  • Device Manager available for device management
  • Big community
  • Well-tested firmware with a wide range of uses
  • Diverse device hardware available
    • 1-channel switch without current measurement
    • 1-channel switch with current measurement 230V AC
    • 4-channel switch potential-free
    • 4-channel switch potential-free with 433MHz radio remote control
    • Valve drive
    • LED light control
    • Temperature sensor
    • Fan
  • Own hardware can be integrated via generic modules
  • Inexpensive from approx.
... Continue reading

3D printing for useful parts

Since 3D printers are cheap these days, it's worth printing out one or the other useful part yourself. The imagination knows no limits. Basically anything you need can be printed. But you have to be a little careful when it comes to the strength and sun tolerance of the parts. Not all plastics are suitable for outdoor maritime applications.… Continue reading


Fig.: Linux program for PC NAVTEX PC

Jürgen from the Segeln-Forum took the trouble to create a Linux program for reading out the data for NASA's PC NAVTEX USB. The PC NAVTEX program is used to display NAVTEX messages that are sent with the NAVTEX receiver "PC NAVTEX USB” of the company NASA were received. The data is transmitted via the serial interface.… Continue reading