Electronic modules from Espressif

For hobbyists, the world of electronics offers interesting microcontroller modules with which many demanding projects can be implemented. Microcontrollers that can be easily and easily programmed are of particular interest. Atmel offers a range of 8-bit microcontrollers with many additional functions integrated, such as program memory, data memory, counters, pulse-width modulated outputs (PWM outputs), analog-to-digital converters (AD converters), digital-to-analog converters (DA converter), serial interface (RS232), various bus systems (I2C) and much more, so that you can implement your own electronic projects without much additional effort.… Continue reading

WiFi battery monitor

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

While searching the Internet for a battery monitor for DC voltages, I came across the PZME-017. The Peacefair company is known for various inexpensive battery monitors with LCD displays such as the PZEM-015.

Fig: PZEM-017 (100A version, with shunt and USB-RS485 adapter)

Fig: PZEM-015 (300A version as a pure display variant)

The PZEM-017 has the following features:

  • Voltage measurement 0… 300V DC
  • Current measurement: 10A, 50A, 100A, 200A, 300A (from 50A via external shunt)
  • Display of the current power in watts
  • Energy display in kWh for the current day, previous day and total consumption display
  • Modbus RTU-Interface (RS485, 9600Bd, 8N2, binary data transmission)
  • Supported Modbus commands:
    • 0x03 Read memory register
    • 0x04 Read input register
    • 0x06 Write single register
    • 0x41 calibration
    • 0x42 Reset energy measurement
  • 7 devices can be used on the Modbus via adjustable ID 1… 7, ID 0 broadcast
  • USB-RS485 adapter (CH341)

In contrast to the PZEM-015, the PZEM-017 has no display and transmits the measurement data via the Modbus.… Continue reading

Instrument display

Video https://youtu.be/0G_1A66hpyE

Video used as voltage input with limit alarm: https://youtu.be/XZPPG5St0Ko


Standard built-in instruments with a diameter of 52mm are often used to display various measured values on boats. These can often only be used for very special tasks with very special sensors. Unfortunately, the display layout differs depending on the task and there is no consistent appearance. In the search for a modifiable display, I came across a built-in instrument for an oil pressure gauge of 0...150 psi.... Continue reading

Low budged energy monitor

Stefan Kaufmann has on his website https://obenschlaefer.com/ presented an inexpensive energy monitor that is also interesting for boat enthusiasts. He originally built the energy monitor for his camper in order to be able to monitor the energy supply. The system is based on components from Victron on. The centerpiece is a Raspi with the free Venus OS firmware from Victron, which is also included in commercial hardware runs, but in this case on an inexpensive Raspi3B.… Continue reading

Integrate Ruuvi Sensor Tag in SignalK

Video: https://youtu.be/NCJYmDuf2Jg

The Ruuvi sensor day is a small, smart sensor device. This allows the following data to be recorded:

  • temperature
  • Humidity
  • Air pressure
  • 3-axis acceleration sensor
  • waterproof case
  • Data storage in mobile phone app
  • Android and iPhone app available

The data is sent to a data terminal at defined intervals using Bluetooth Low Energy to save energy. This can be a cell phone, for example, where you can look at the data.… Continue reading

Weather forecast with AZ-Touch

The AZ touch Mod is a small 2.4 ″ touch color display with 320 x 240 pixels. On the base board can be used as a control unit ESP32C or a Wemos D1 mini be attached. A small breadboard allows you to set up your own circuits to expand the display.

The AZ-Touch has the following features:

  • Wall housing 120mm x 80mm x 35mm (W x H x D)
  • Resistive touchscreen 2.4 inch (6.14 cm) color TFT with 320 x 240 pixels (ILI9341)
  • For D1mini or ESP32 Dev-Kit C V2 / 4
  • built-in piezo buzzer
  • Integrated 5V voltage regulator (input voltage 9 - 35V DC)
  • power consumption approx.
... Continue reading

Multifunction display OBP 60

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

Display in action


open boat projects LIVE:
Video presentation in German on the OBP 60 multifunctional display (45min presentation, 30min discussion)

After we have dealt with the M5Stack as a multifunction display have been busy and were able to show some applications at Boot 2020, we are taking a new approach for a new multifunction display.… Continue reading

IR remote


After Christian at Boot 2020 in connection with his plotter had introduced a Bluetooth remote control there is now a new IR remote control. It turned out that Bluetooth is not really suitable for a remote control, as there were significant problems with Linux when creating the connection and the remote control did not work as expected.… Continue reading

I2C modules by Horter & Kalb


The I2CModules of the Horter company (LxW 65x45mm) can be used for boat automation because they can be connected to any microcontroller and the Rasperry Pi. The I2C bus is actually intended for communication between ICs on a circuit board. But there are also numerous Extensions with which the bus signals can be amplified and electrically isolated so that longer distances of up to 50m can be bridged with shielded cables.… Continue reading