M-DUINO 21 I/Os PLUS (Optoisolated Output)
Arduino-based industrial PLC with 21 I/Os, optoisolated output, multiple communication ports, and support for remote programming and module expansion.
Start wiring
USB · 5 V · 3.3 V
Arduino
75 other optionsAbout 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.
Related groups
4 groups
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Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
Boards · Other MCU boards · 226 parts
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The Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.
Boards · Pico & RP2040 boards · 44 parts
