This is why you can communicate with the board serially using a USB cable and the Serial Monitor feature of the Arduino IDE. The Arduino UNO has its own FTDI chip whose function is to convert TTL signal levels to USB. The Arduino act as a USB serial bridge between the computer’s USB port and the MCU’s serial port. Overview ESP-12 is a low power consumption of the UART-WiFi module, with very. I always use this method to communicate with an ESP8266 module. ESP-12E: ESP8266 Serial Port WIFI Wireless Transceiver Module for Arduino. Here we will learn how to use Arduino as a USB Serial converter. Or for some other reason, we need a USB to serial converter. There are always USB-TTL adapters available for Serial communication but sometimes we are in a dire need of these adapters but can’t find it. It has to do serial/parallel conversion and the timing input and output the bits. It has to do a lot more work than using the hardware USART. The software serial library creates a UART in software and should be able to use any digital I/O pins. USB is the universally accepted port these days, and if you are into Microprocessor Programming you must be dealing with Serial communication to communicate with your device. One thing I could not get to work was using a real serial port on the PC to program an ESP8266.
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