![]() ![]() It stands for Input Output voltage REFerence. The multiple SPI devices in Arduino are able to share the same SS, MOSI, and MISO lines. The MISO, MOSI, and SS support SPI communication. It is the Slave Select line, which is used by the master. The slave line in MOSI is used to send data to its peripherals. The MOSI line Arduino carries the data from Arduino to the control devices of SPI. It stands for Master Output/ Slave Input. The slave line in MISO is used to send data to the master. SPI can even have various devices on the bus. In slave, it works as the input of the clock generator. It is popularly used by the microcontrollers to communicate with one or more peripheral devices quickly. It stands for Serial Peripheral Interface. The digital pins have the value either HIGH or LOW. The 15 pins from the digital I/O are PWM (Pulse Width Modulation) pins numbered from D2 - D13 and D44 - D46. There are 54 digital Input/Output pins from pin numbered from 0 to 53. It can also act as GPIO (General Purpose Input Output) pins. The function of Analog pins is to read the analog sensor used in the connection. There are total of 16 Analog pins from A0 - A15. ![]() ![]() The SCL is a clock line, while SDA is a data line. The I2C is a serial communication protocol that uses SCL (Serial Clock) and SDA (Serial Data) to receive and send data between two devices. It is the two-wire serial communication protocol. The structure of the ICSP header is shown below: The program or firmware with the advanced functionalities is received by microcontroller with the help of the ICSP (In-Circuit Serial Programming) header. The adapter is plugged-in to the power jack of the Arduino Mega board. The power jack is used to supply the power to the board. It permits the Arduino to communicate with serial devices. It stands for Universal Asynchronous Receiver and Transmitter. We usually plug the USB cable in the USB port to load the sketch to the board. It is essential for the programming of the Arduino Mega board. It allows the board to connect to the computer. The ground pins are used to ground the circuit. It is recommended for complex projects, such as Robotics, etc. It is used for the boards that require more memory, sketch, and I/O lines. Here, AVR stands for Audio Video Recorder and RISC stands for Reduced Instruction Set Computing. The Mega 2560 is based on AVR RISC Architecture. ![]() ATmega2560 Microcontroller - The Atmega2560 is a CMOS (Complementary Metal Oxide Semiconductor) low powered 8-bit microcontroller.The description of pins present on the Arduino board are listed below: The Pinout of Arduino Mega is shown below: The advantage of using the Arduino Mega board over other boards is that it gives the advantage of working with more memory space. Also, if I use the shield, can I not use them (50 - 53) for digital IO.The Arduino Mega is based on ATmega2560 Microcontroller. So how can Mega use these pins to communicate with the shield. The shield is compatible with UNO and Mega, so placed over and extends the same pins (0 - SCL & A5 - IOREF), it can't be placed over 50, 51, 52 on Mega. On the Mega, the hardware SS pin, 53, is not used to select either the W5500 or the SD card, but it must be kept as an output or the SPI interface won't work. These pins cannot be used for general I/O. On both boards, pin 10 is used to select the W5500 and pin 4 for the SD card. This is on digital pins 10, 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. On the Mega, the hardware SS pin, 53, is not used to select the Ethernet controller chip, but it must be kept as an output or the SPI interface won't work.Īrduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. The Arduino board communicates with the shield using the SPI bus. Just starting with Mega and bit confused about the documentation. ![]()
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