This CP2104 USB to Serial Converter is super tiny, a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating and programming.
There huge kind of USB to Serial converters on the market, while we Makerfabs design this module specially:
1. 3.3V/5V compatible, with a switch on the boards, to select;
2. DTR pins available, which is essential for Arduino auto-programming;
3. Super tiny, with a micro USB connector.
With this easy/cheap module, it would be the most ever easy for communication between your PC with Arduino, both for serial port communication of Arduino auto-programming, such as the Lora moisture sensor and Lora 30A relay.