M-DUINO PLC Arduino Ethernet 38R I/Os Relay / Analog / Digital PLUS


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4.13 out of 5

12 Inputs

(8x) Analog (0-10Vdc) or Digital (5-24Vdc) | (4x) Digital Interrupt (5-24Vdc)

22 Outputs

(16x) Relay (220Vac – 5A)| (6x) Analog (0-10Vdc) or Digital (Optoisolated)

Ethernet, USB, RS485, RS232, I2C, Modbus bus



Arduino MEGA included

(8x) 10bit – Analog (0-10Vdc) / Digital (24Vdc) Inputs, configurable by software

(4x) Interrupt Input (24Vdc). “Can work like Digital Input (24Vdc)”


Arduino MEGA included

(16x) Relay outputs (220Vac –‐ 5A)

(6x) Analog (0–‐10Vdc, 8bit ) / Digital (24Vdc) Output


– (1x) Ethernet port.

– (1x) USB port (type B).

– (1x) I2C port. (Interface with other Industrial Shields, sensors, I/Os modules)

– (3x) TTL ports.

– (1x) RS-232 port.

– (1x) HALF/FULL Duplex RS-485 port.

– (1x) SPI external port (Using MOSI,MISO, SS pins of Arduino)

– TCP IP / Modbus TCP. / Modbus RTU

– WebServer capacity

– Industrial Protocols

Other technical specifications

RTC (Real Time Clock. NOTE: I2C port used. See pinout modification)

µSD Socket (using SPI port, chip select D53 pin. See pinout modification).


DIN Rail mounting.

Max consum.: 1.2A

Flash Memory: 256kB (8kB for bootloader)



Clock Speed: 16MHz

*Rx,Tx pins are not available using RS485. For SPI you need to choose another pin for Select Function (You can choose, SDA, SCL, Rx, Tx, Pins of Arduino)

Documents & Files


Modular PLC
This is the first equipment based on the Arduino technology designed for a professional use. This PLC has 34I/Os1. It also contains several communication systemswhich provide more flexibility and control. The M-DUINO family offers the possibility to expand up to 127 modules through I2C, which means that you can have until 7100 Inputs / Outputs in Master-Slave connections, additionally to sensors, etc…

Programming Software
This PLC can be programmed using the Arduino IDE platform. See the Documentation menu below to download the software for free.

Instantantaneous connection and coding.
The PLC M-DUINO is programmed through the USB ports. This PLC can also be programed through Ethernet port remotely. This offers and immediate access to program, mantain and control. Also you can continuously monitor the status for all the variables, inputs, outputs, etc. It is compatible with the Arbosx and the Touchberry Pi with instantaneous connection.

1 See technical specs



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In additional of the basic M-duino. PLUS version include:
– Full/Half duplex RS485 port.
– µSD Socket
– Possibility to use MODBUS RTU using RS485 port working as a hardware Serial.
– RTC (Real time clock available).

8 reviews for M-DUINO PLC Arduino Ethernet 38R I/Os Relay / Analog / Digital PLUS

  1. Rated 5 out of 5

    H. Gustaffson

    Bra produkt och bra service. Grattis!

  2. Rated 4 out of 5

    Michael Needam

    We started with the mduino 21 and now the relay 38. We had to load the library twice in the IDE because the link wasn’t working.
    The plc works really good.

  3. Rated 4 out of 5

    Jean Piedrix

    The shipping was slow 🙁 but I am really happy with this product.

  4. Rated 3 out of 5

    Charlie Muñoz

    Después de algunos problemas con la configuración del puerto Ethernet ya tenemos el autómata funcionando. Es una instalación que está en un ambiente algo hostil, en un centro meteorológico de media-alta montaña. Confiamos en que el equipo no tenga incidencias y así poder empezar a usarlo en serie.

  5. Rated 4 out of 5


    Prima esperienza con questo “arduino”, per il momento senza problemi.

  6. Rated 4 out of 5

    Philippe J.

    La programmation… ce n’est pas facile au début.. Maintenant il marche très bien!
    Merci bien 🙂

  7. Rated 5 out of 5

    Jose Ignacio

    Instalado en una pequeña estación meteo como paso previo a un data miner. Sin problemas y envío rápido.

  8. Rated 4 out of 5

    Manu Hernan

    programacon algo complicada pero hemos instalado ya el automata. Funciona todo bien. Enviado en 2 dias.

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