Output devices : Relay, LED, buzzer, LCD and others. Digital pins (70): Digital pins (0-53) + Analog (0-15) = Total Digital I/O pins.ĭigital Pins: From 0-53(digital) and 0-15(analog) can be use as input or output for digital transducer and output devices by pinMode() for pin direction, digtalWrite() to write pin and digitalRead() to read pin status. XTAL1,XTAL2: Crystal (16Mhz) is connected to supply clock for controller with 2 bypass capacitor to ground.ĪREF: This pin is used, when we use Adc for analog to digital conversion with external reference voltage for conversion and don’t want to use internal 1.1V or 5v reference. Arduino Mega has inbuilt reset circuit with push button to reset system and this pin can be used by other devices to reset controller. RESET: (Reset input) A low level on this pin for longer than the 4 clock cycle will generate a reset. Arduino Mega Pinout Arduino Mega Pinout Power pins : Arduino Megaįor External hardware device power supplyįor External low voltage hardware device power supplyĪrduino Mega Pin Diagram Arduino Mega Pin Configuration Controller Pins: USB (Programming with ATmega 8), ICSP (programming), SPI, I2C and USARTĪrduino Mega – Advanced Features Arduino MegaĪrduino Mega 2560 is also packed with additional features like Analog Comparator, External Interrupt & Software Interrupt, Power Saving Mode, Inbuilt Temperature Sensor, RTC and more. Arduino Mega 2560 SpecificationsĪrduino Mega – Basic Features Arduino Mega Due to the many numbers of pins, it is not usually used for common projects but you can find them in much more complex ones like Radon detectors, 3D printers, temperature sensing, IOT applications, real-time data monitoring applications etc. The Arduino Mega 2560 is a replacement of the old Arduino Mega, and so in general reference, it will be called without the ‘2560’ extension. It supports ICSP as well as USB microcontroller programming with PC. It is also compatible with the different type of boards like high-level signal (5V) or low-level signal (3.3V) with I/O ref pin.īrownout and watchdog help to make the system more reliable and robust. With large FLASH memory and SRAM, this board can handle large system program with ease. Other features include JTAG support for programming, debugging and troubleshooting. It has more than 5 pins for Vcc and Gnd to connect other devices to Arduino Mega. Secondly, it has inbuilt RTC and other features like analog comparator, advanced timer, interrupt for controller wakeup mechanism to save more power and fast speed with 16 Mhz crystal clock to get 16 MIBS. First feature is the large I/O system design with inbuilt 16 analog transducers and 54 digital transducers that supports with USART and other communication modes. *out |= bit // set the bit e.g.When cheaper boards are available, why go with Arduino Mega? The main reason behind this is the additional features that are inbuilt with this board. SREG = oldSREG // restore state register (enable interrupts) Set the Arduino pin 13 as output (equivalent to pinMode(13,OUTPUT)) DDRB |= 1 0101 You don't need to care about MCUCR, unless you want to disable pull-up on all pins. Port B and bit 7.īit 7 in DDR B controls the direction (input/output)īit 7 in PORT B controls the output (high/low) You can find which Arduino pin is connected to which ATMega pin in schematic.Įxample: Controlling Arduino pin 13 find the port and bit for Arduino pin 13īy looking at the pinout map above, you will find "PB7" next to pin 13.Īrduino pin 13 is connected to ATMega2560 pin P B7 on the Arduino circuit board. The pinout map above is derived from the schematic. Look at the schematic for Arduino Mega and the ATMega2560 Datasheet The tan box in the pinout map below shows the pin name assigned by Atmel (who makes the chip). To toggle a given Arduino pin, you will need the x (port) and n (bit) to locate the registers and bits. “x” represents the numbering letter for the port, and “n” represents the bit number.įinding the registers for a given Arduino pin PUD in MCUCR disables all pull-up resistors if it is set to 1. PORTxn bit in PORTx register controls the output (high/low digitalWrite()) Three bits in three registers control the state of a GPIO pin:ĭDxn bit in DDRx register controls the direction (input/output pinMode()) The I/O section from the ATMega2560 datasheet (linked below) explains how to configure and toggle a GPIO (General Purpose Input/Output) pin. 4 pinMode() and digitalWrite() under the hood.3.3 set the Arduino pin 13 as input (equivalent to pinMode(13,INPUT)).3.2 set the Arduino pin 13 as output (equivalent to pinMode(13,OUTPUT)).3.1 find the port and bit for Arduino pin 13. 2 Finding the registers for a given Arduino pin.
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