The 16u2 pinout is the same for Arduino Uno/Mega. Keep in mind that the Leds have inverted logic. Writing LOW means turn them on. 16u2 Pinout [NC] = Not connected on an Arduino Uno/Mega R3 D0 - [NC] ...

PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

There are plenty of Arduino compatible boards with WiFi based on ESP8266 WiSoC going for around $5 to $10, ... 2.4GHz ISM, and an RTC for $24. Winkel board specifications: MCU – Microchip/Atmel ...

16u2 Bootloader to reprogram 16u2 + 328/2560 with Arduino IDE - Arduino Uno Mega 16u2 Pinout · NicoHood/HoodLoader2 Wiki. 16u2 Bootloader to reprogram 16u2 + 328/2560 with Arduino IDE - ...