Connect your M-Bus installations with Moduino ESP32

Moduino ESP32 is a compact, powerful and versatile IoT device that can be used for various industrial automation and control applications. One of the communication protocols it supports is the M-Bus (Meter-Bus) protocol. This protocol is used for communication between energy meters, heat cost allocators and other devices in the energy management and building automation systems.

In this article, we will discuss how to use Moduino ESP32 with the M-Bus protocol using RS-232 communication.


  • Moduino ESP32
  • M-Bus devices (e.g energy meters)
  • RS-232 to RS-232 cable

Hardware Connections

  1. Connect the Moduino ESP32 to the M-Bus device using an M-Bus cable.
  2. Connect the Moduino ESP32 to a computer using an RS-232 to RS-232 cable.

Software Setup

  1. Download and install the Arduino IDE from the official website.
  2. Open the Arduino IDE and go to File -> Preferences.
  3. In the Additional Board Manager URLs field, add the following URL:
  4. Go to Tools -> Board: -> Board Manager and search for “esp32”.
  5. Install the “ESP32 by Espressif Systems”.
  6. Go to Tools -> Board and select “ESP32 Dev Module”.
  7. Go to Sketch -> Include Library -> Manage Libraries.
  8. Search for “MBus library” and install it.


  1. Create a new sketch in the Arduino IDE.
  2. Include the M-Bus library by adding the following line at the top of the sketch:
cCopy code#include <MBus.h>
  1. Define the M-Bus object and the serial port for communication:
scssCopy codeMBus mbus;
HardwareSerial mbusSerial(2);
  1. In the setup() function, initialize the serial port for communication and start the M-Bus:
scssCopy codevoid setup() {
  mbusSerial.begin(2400, SERIAL_8N1, 16, 17);
  1. In the loop() function, read the M-Bus data and print it to the serial monitor:
scssCopy codevoid loop() {
  if (mbus.available()) {
    MBusDataFrame data =;
  1. Upload the code to the Moduino ESP32 using the Upload button in the Arduino IDE.


With the above steps, you have successfully set up Moduino ESP32 with the M-Bus protocol using RS-232 communication. This will allow you to communicate with M-Bus devices and receive data from them, which can be further processed for industrial automation and control applications.

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eSIM support for Rasperry Pi based ModBerry industrial device

eSIM support for Rasperry Pi based ModBerry industrial device

The embedded SIM card (eSIM) is a form of programmable SIM card that is directly built in the device. eSIM is a global GSMA specification that enables remote SIM delivery to any supported device, and GSMA defines eSIM as the SIM card for the next generation of connected consumer / professional devices and network solution with the use of eSIM technology.

Easy SIM operator swap

In Industrial IoT applications in which there is no need to change the SIM card, the need of using a connector is avoided, which increases reliability and data security. eSIM can be remotely configured – users can add or change operators without having to physically swap the SIM card from the device. It is often a crucial requirement for the installations where factors such as temperature, water and shock resistance, as well as lack of access forces user to choose remote solutions.

eSIM Raspberry Pi Connvectivity

Raspberry Pi & ESP32-based devices

TECHBASE company is now developing eSIM support for Raspberry Pi and ESP32 industrial devices, such as ModBerry and Moduino X to improve the handling of wireless modem connectivity. To receive an offer for ModBerry/Moduino device with eSIM-based modem, contact our Sales Department via e-mail or Live Chat.

Economical Moduino X3 with ESP32 on-board available NOW

Moduino X3 ESP32

New version of Moduino ESP32, model X3 designed for various economical applications

Moduino X3 model offers new approach to Industrial IoT by upgrading mainboard elements to ensure high performance and ultra-low cost of implementation. In comparison with X2 version, new X3 limits additional ExCard expansion modules, drasticly changing the price of the device, but maintaining the 3-terminal I/Os of previous model. An important change is providing opto-isolation for DIO interface (optionally interchangeable with Relay interface for that I/O).

New version of Moduino ESP32, model X3 is designed for various economical applications, such as Industrial IoT installations, data management & remote edge-devices control. Basic configurations of X3 can be purchased for a price even lower than X1/X2 models for development purposes. Please contact our Sales Department (via Chat or e-mail) to get best price for these devices.

To read more about Industrial Moduino X solution, check here: 

PDF Datasheet  

Full comparison below:

Moduino ESP32 Comparison

To order configurable devices, choose Moduino X3 option in Moduino X product configurator here:



Moduino ESP32 controller now powered with Pycom modules

New base platforms for Moduino device

Revised version of TECHBASE’s Moduino edge controller offers now support and compatibility with wide range of Pycom’s compute modules with built-in communication interfaces, e.g. LoRa, Sigfox, NarrowBand-IoT / LTE cat. M1/NB1 and WiFi/BT4.2, similarly to standard Moduino devices, powered by Espressif’s ESP32-WROVER module.

With new Moduino platform you can choose from variety of Pycom modules to power the unit, in order to receive specific wireless features. At the present day Moduino supports these models:

    • WiPy 3.0 with WiFi & Bluetooth 4.2
    • SiPy with WiFi/BT and Sigfox
    • LoPy4 with WiFi/BT and LoRa, Sigfox
    • GPy with WIFi/BT and NarrowBand-IoT / LTE cat.M1/NB1
    • FiPy with WIFi/BT and LoRa, Sigfox, NarrowBand-IoT / LTE cat.M1/NB1

If physical network connection is a must, you can always choose standard Moduino ESP32 with Ethernet expansion module to ensure communication via LAN. Of course the possibility to choose wired-to-wireless communication is also available with the Moduino configurator.

All Pycom-based Moduino solutions are compatible with wide range of interface expansions for standard Moduino ESP32 platform, e.g. RS-232/485, Analog I/Os, Digital I/Os, Relay, CAN and many more, including SuperCap & OLED screen options. You can find the whole list of available expansions here:

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