RS-232 with Arduino and ESP32 based PLCs Jun 19, 2026 Introduction RS-232 is a widely used communication protocol for serial data exchange between devices, offering simplicity and reliability in industrial applications. Industrial Shields PLC families, i... Read more
MQTT on M-Duino with OpenPLC and Raspberry PLC Jun 18, 2026 En este blog configuraremos un M-Duino Arduino PLC como esclavo MQTT y un Raspberry PLC como maestro. Si seguiste nuestro blog anterior en el que usamos Node-RED como maestro, puedes reutilizar los mi... Read more
HTTP on M-Duino with OpenPLC Jun 18, 2026 OpenPLC no soporta el protocolo HTTP de forma nativa, pero existe una solución alternativa. En este blog aprenderemos a crear una extensión de Arduino para OpenPLC y usarla para enviar o recibir infor... Read more
MQTT on M-Duino with OpenPLC Jun 18, 2026 In this post, we will configure an M-Duino Arduino PLC as an MQTT slave and a computer as the master. First, we will configure the M-Duino Arduino PLC to send the value of I0.0 to the master; then we ... Read more
Mapping any M-Duino PLC for OpenPLC Jun 18, 2026 Note: this post was created before M-Duino Arduino PLC was officially supported in OpenPLC. For an updated guide on using M-Duino Arduino PLC with OpenPLC, see this post: Using ESP32 PLC, M-Duino Ardu... Read more
OpenPLC on M-Duino 42+ Jun 18, 2026 Note: this blog was made before M-Duino Arduino PLC was officially implemented into OpenPLC. For an updated guide on how to use M-Duino Arduino PLC with OpenPLC, visit this blog: Using ESP32 PLC, M-Du... Read more
Node-RED: How to make a custom design gauge for your dashboard Jun 18, 2026 Introduction Node-RED is a powerful, open-source visual programming tool designed to simplify the process of wiring together hardware devices, APIs, and online services in new and innovative ways. Nod... Read more
ACS712 current sensor with Arduino-based PLC: wiring and sketch Jun 18, 2026 The ACS712 is a Hall-effect current sensor by Allegro MicroSystems that outputs an analog voltage proportional to the AC or DC current flowing through it. Connecting one to an Arduino-based PLC gives ... Read more
FZ0430 voltage sensor module with Arduino-based PLC: wiring and sketch Jun 18, 2026 The FZ0430 is a resistive voltage divider module that scales DC voltages up to 25 V down to the 0-5 V range readable by an Arduino analog input. Connecting one to an Arduino-based PLC gives you direct... Read more
Controlling ESP32 PLC digital outputs with Arduino Cloud Jun 15, 2026 This article is the second in a series on using the Industrial Shields ESP32 PLC with Arduino Cloud. It shows how to add a cloud variable, configure the network, upload the sketch, and build a dashboa... Read more
Detecting RFID tags with the RC522 reader and M-Duino PLC Jun 15, 2026 RFID (Radio Frequency Identification) technology enables automatic identification of objects and people via tags that transmit a unique UID when brought near a reader. This article shows how to connec... MDuino Open-Source SPI Read more
Reading the IE5345 inductive proximity sensor with M-Duino PLC Jun 15, 2026 The IE5345 is an IFM inductive proximity sensor that detects metallic objects at a range of 5 mm and outputs a digital signal. Because inductive sensors respond only to metal, they work reliably in we... MDuino Sensor Read more