KEYESTUIDO Mega plus R3 2560 Board, whose processor core is 2560-16AU, is fully compatible with MEGA REV3 2560. USB to TTL chip adopts more economic and stable CP2012. This plus board consists of 54-channel digital input and output ports, of which 15 pins are served as PWM output, 16 analog inputs, 4 serial communication ports, one 16MHz crystal oscillator, 1 USB port, 1 power socket, 1 ICSP interface and 1 reset button.
Before using the KEYESTUDIO Mega Plus Board, you must install the driver of it, otherwise it will not communicate with computer.
Unlike the USB series chip (ATMEGA8U2) of the mega, the KEYESTUDIO Mega Plus Board is used the CP2102 chip USB series.
Note:
1. Please make sure that your IDE is updated to 1.8.0 or newer version, since the driver of the CP2102 chip is included in 1.8.0 version and newer version of IDE.
2.If the version of IDE you download is lower than 1.8, you should download the driver of CP2102 and install it manually.
1.Download the Windows Driver
https://fs.keyestudio.com/CP2102-WIN
2. How_to_Install_the_Driver_of_CP2102_on_MAC_System
https://wiki.keyestudio.com/How_to_Install_the_Driver_of_CP2102_on_MAC_System

Specifications:
Microcontroller: 2560-16AU
USB to TTL chip：CP2102
Operating Voltage: 5V
Input Voltage (recommended):DC 7-12V
Digital I/O Pins: 54 (D0-D53)
PWM Digital I/O Pins：15(D2-D13 D44-D46)
Analog Input Pins: 16(A0-A15)
DC Current per I/O Pin: 20mA
DC Current for 3.3V Pin: 50mA
Flash Memory: 256 KB of which 8 KB used by bootloader
SRAM: 8KB
EEPROM: 4KB
Clock Speed: 16MHz
LED_BUILTIN:D13

Special Interfaces Description
Serial communication interface(4 channel): Serial（D0 =RX0, D1 =TX0）, Serial1（D19 is RX1, D18 is TX1)
Serial2 （D17 is RX2, D16 equals to TX2）, Serial3（D15 is RX3, D14 is TX3), D0 and D1 are connected to ATMEGA16U2-MU