I/O modules that connect a microcontroller to the physical world: 12/24 V sensors, relays, valves, pumps, motors, 0–10 V, ±10 V and 4–20 mA signals.
🔌 Isolated digital in, relay, latching relay, SSR, NPN, MOSFET, analog, combo
📐 One 47×56 mm form factor, isolation per channel
🔗 GPIO or I²C (Qwiic)
🧩 IoTsmart, IoTbase, Raspberry Pi, Pico, Nano, ESP32
📖 Open hardware, schematics on GitHub
#IoTextra #IIoT #ESP32 #RaspberryPi #OpenHardware #NodeRED #Tasmota #HomeAssistant