“Hopefully everybody will agree with me that the Arduino Serial is a great tool for debugging your projects. Well, it’s basically the only option for debugging an Arduino. But sometimes, it is not possible or practical to run a USB cable from the Arduino or any other microcontroller into your computer.
So I made this UART-WiFi board, based on the ESP8266-01, which is dirt cheap these days. The boards is small, you can plug it into a breadboard, connect power, RX, TX and ground and it will transmit everything it receives from the UART to you computer via WiFi and vice versa.
Features:
baudrates up to 115200 (theoretically even up to 921600, but this is not tested) receives/sends data from UART and sends/receives data via WiFi directly to your computer using port 23 (Telnet) 18 components, parts cost about USD 3.5020 x 45 mm dual sided PCB, breadboard compatible 5 V tolerant RX pin voltage input from 12 V to 3.3 V, current draw about 80 mA on averageI have been using these boards for about half a year now and I found them extremely useful. I even prefer them to USB-UART bridges, because with my board, I just plug one of them into a breadboard and I do not need to worry about running cables all across my desk. You also do not any any other hardware, no free USB ports and these boards provide full galvanic isolation from your computer, which is a good safety precaution and you do not need to worry about different ground potentials.”