The Adafruit Metro RP2350 is a Raspberry Pi RP2350 development board that closely follows the Arduino UNO form factor for compatibility with existing Arduino shields. Key features include 37 GPIOs, a ...

The controller also features a 2.33-inch touchscreen display, a 10A relay, a 12V to 24V DC screw terminal for power, 5V USB-C port for programming ... and external antenna LILYGO provides Arduino code ...

Of course he could modify a refrigerator and humidifier to be controlled separately, but [Mike] decided the best course of action would be to control line voltage with an Arduino. [Mike] started ...