wokwi-arduino-mega

Arduino Mega 2560 board reference - powered by ATmega2560 with 54 digital pins and 16 analog inputs

Arduino Mega 2560. Powered by the ATmega2560 chip, which has 256K bytes of Flash program memory, 8k bytes of SRAM and 4K bytes of EEPROM. The board features 54 digital pins, 16 analog input pins, and 4 serial ports. It runs at 16MHz.

Pin names

Pins 0 to 53 are digital GPIO pins. Pins A0 to A15 double as analog input pins, in addition to being digital GPIO pins.

There are five ground pins: GND.1 (next to pin 13), GND.2/GND.3 (next to the Vin pin), and GND.4/GND.5 (at the bottom of the dual-row female header connector)

Pins VIN / 5V are connected to the positive power supply. There are also two additional power supply pins, 5V.1/5V.2, at the top of the dual-row female header connector.

Pins 3.3V / IOREF / AREF / RESET are not available in the simulation.

Digital pins 2 … 13, 44, 45, and 46 have hardware PWM support (total of 15 PWM channels).

Some of the digital pins also have additional functions:

Pin	Function	Signal	External interrupt
0	Serial	RX
1	Serial	TX
2			INT4
3			INT5
19	Serial1	RX	INT2
18	Serial1	TX	INT3
17	Serial2	RX
16	Serial2	TX
15	Serial3	RX
14	Serial3	TX
20	I2C	SDA (Data)	INT1
21	I2C	SCL (Clock)	INT0
50	SPI	MISO
51	SPI	MOSI
52	SPI	SCK (Clock)

On board LEDs

The board includes four LEDs:

LED	Function
L	Connected to digital pin 13
RX	Serial RX Activity
TX	Serial TX Activity
ON	Power LED. Always on while the simulation is running

In general, only the “L” LED can be controlled by the user’s code. You can use the LED_BUILTIN constant to reference it from your code:

pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);

See Blink for a complete code example.

Simulation features

The Arduino Mega 2560 is simulated using the AVR8js Library. The table below summarizes the status of features:

Peripheral	Status	Notes
Processor	✔️
GPIO	✔️	Including External/Pin Change Interrupts
8-bit timers	✔️	Timer0, Timer2
16-bit timers	✔️	Timer1, Timer3, Timer4, Timer5 *
Output Compare Modulator	❌
Watchdog Timer	✔️
USART	✔️	USART0, USART1, USART1, USART3
SPI	🟡	Master mode only
I2C	🟡	Master mode only
EEPROM	✔️
Clock Prescale	✔️
ADC	✔️	Used by analogRead()
Analog Comparator	❌
GDB Debugging	✔️	See the GDB Debugging Guide

Legend: ✔️ Simulated 🟡 Simulated, but see notes ❌ Not implemented

* Input Capture is not implemented in the 16-bit timers.

If you need any of the missing features, please open an issue on the AVR8js repo or reach out on Discord.

Serial Monitor

You can use the Serial Monitor to receive information from your Arduino code, such as debug print. You can also use it to send information to your code, such as textual commands.

For more information and code samples, check out the Serial Monitor guide. It also explains how to connect the serial monitor to a different pin (e.g. to Serial2 instead of Serial), and how to configure the line ending characters.

Libraries

The simulator supports many popular Arduino libraries. For a complete list, see the Libraries guides.

Simulator examples

• Arduino Mega Blink