![]() This board supports UART serial communication protocol with two pins Tx and Rx. The I2C protocol is used to develop communication between two or more integrated circuits. The SDA is a serial data pin used to carry the data while SCL is a serial clock line used to synchronize all data transfer over the I2C bus. The Nano 33 contains the I2C two-wire communication protocol. These pins are used to send or receive data by the controller. Two pins: MISO (Master Input Slave Output) and MOSI (Master Output Slave Input) are incorporated for SPI communication between devices. This is the serial peripheral interface that is used to develop communication between a controller and other peripheral devices like shift registers or sensors. These pins, when activated, generate analog results with digital means. These pins can receive any value in contrast to digital pins that receive only two values i.e. When pins receive 0V they are in a LOW state when they receive 5V they remain in the HIGH state. These pins receive only two values HIGH or LOW. The Nano 33 board contains 14 digital pins that you can use as input or output depending on the requirement. ![]() In this section, we will detail the pin description of each pin incorporated on the board. This is the little introduction to Nano 33. one is a built-in LED connected to pin 13 of the board and the other is the power LED that turns on when power is supplied to the board. The following figure shows the pinout diagram of Arduino Nano 33 IoT.
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