Despite the differences in size and microcontroller, the Arduino Nano and Micro share some ... Their onboard LEDs are connected to pin D13, and their serial RX/TX pins are on pins D0 and D1 ...

This isn’t an ESP8266 shield, either: you can write code for the ESP module, connect the serial pins, and hit the program button. The basic functions of the Arduino IDE – pinMode, digitalRead ...

You’ll find an FTDI chip on Arduino boards that have a USB connector. It’s used to handle the USB communications on one side, and TTL serial communications on the other. The serial pins from ...