The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. ... Zero - Arduino Try Out. From the circuit diagram of the module, it is ...

Arduino Uno - The World's Most ... shield compatibility and 5 V power supply of the popular UNO R3, the UNO R4 adds a 32-bit ... which allows users to minimize wiring and execute different tasks ...

IO connections are in physically similar positions to Uno R3, and IO remains 5V. USB connector changed to Type-C. 6 – 24Vin (barrel jack – higher than Uno R3) 5Vin (USB-C) 14x digital GPIOs, D0-D13 ..