The Arduino Uno is the old standby of the Arduino world, with the Arduino Due picking up where the Mega left off ... configurable as a UART, I2C, or SPI. USB device and host are also implemented ...

Each of the 14 digital pins on the Arduino Uno can be used as an input or output ... Provide 8-bit PWM output with the analogWrite() function. SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins ...

The Arduino Mega's PWM pins are digital output pins located ... If your board has no printed labels, check out its pinout diagram documentation (found on the board's Arduino Store page).