The Keyestudio UNO is a board based on the Arduino board with the ATmega328P microcontroller which, unlike the standard version, incorporates the three-pin interface (VCC, GND and Signal) for each of the inputs and outputs of the Arduino.
Keyestudio UNO incorporates the 3-pin interface or socket that facilitates the connection of sensors and actuators, connecting the VCC and GND power supply for each of the elements, even going so far as to avoid the need to work with a test board. To facilitate the connection, it has a 3-pin interface that corresponds to the 14 digital pins, 6 analogue pins, 1 pin cap for serial communication and 1 for IIC or I2C communication. It also has a reed switch to select 5 V or 3.3 V power supply.