ARDUINO MEGA PINOUT
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DIGITAL PINS (Basic, D0-D13)
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D0  - RX0 (Serial)
D1  - TX0 (Serial)
D2  - Digital
D3  - PWM
D4  - Digital
D5  - PWM
D6  - PWM
D7  - Digital
D8  - Digital
D9  - PWM
D10 - PWM
D11 - PWM
D12 - Digital
D13 - Digital/LED

COMMUNICATION PINS
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D14 - TX3          D15 - RX3
D16 - TX2          D17 - RX2
D18 - TX1          D19 - RX1
D20 - SDA (I2C)    D21 - SCL (I2C)

ADDITIONAL DIGITAL PINS
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D22-D53 - Digital I/O
PWM Pins: 2-13, 44-46

ANALOG PINS (A0-A15)
-------------------
A0-A15 - Analog Inputs
(All can be used as digital I/O)

SPI PINS
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50 - MISO
51 - MOSI
52 - SCK
53 - SS

POWER
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VIN  - Input Voltage (7-12V)
GND  - Ground (multiple pins)
5V   - 5V Output
3.3V - 3.3V Output
AREF - Analog Reference
RST  - Reset