Every Arduino Mega 2560 pin with its capabilities (digital, PWM, ADC, I2C, SPI, UART) and the wiring gotchas that bite. The big UNO: 54 digital pins (15 PWM), 16 analog inputs and 4 hardware serial ports. For projects that simply run out of pins.
| Pin | Capabilities | Watch out |
|---|---|---|
| D2 | DigitalPWMInterrupt | |
| D3 | DigitalPWMInterrupt | |
| D13 | DigitalPWMBuilt-in LED | |
| D14 (TX3) | DigitalUART3 TX | |
| D15 (RX3) | DigitalUART3 RX | |
| D16 (TX2) | DigitalUART2 TX | |
| D17 (RX2) | DigitalUART2 RX | |
| D18 (TX1) | DigitalUART1 TXInterrupt | |
| D19 (RX1) | DigitalUART1 RXInterrupt | |
| D20 (SDA) | DigitalI2C SDAInterrupt | |
| D21 (SCL) | DigitalI2C SCLInterrupt | |
| D44 | DigitalPWM | |
| D50 (MISO) | DigitalSPI MISO | |
| D51 (MOSI) | DigitalSPI MOSI | |
| D52 (SCK) | DigitalSPI SCK | |
| D53 (SS) | DigitalSPI SS | |
| A0 | Analog inDigital | |
| A15 | Analog inDigital | |
| 5V | Power out 5V | |
| 3.3V | Power out 3.3V | Max ~50 mA |
| VIN | Power in 7–12V | |
| GND | Ground |
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