220VAc 4000W SCR Voltage Regulator Motor Speed Controller Dimming Thermostat

Microcontroller: ATmega2560 Operating Voltage: 5VDC Input Voltage (recommended): 7-12V through DC jack Input Voltage (limits): 6-20V through DC jack Digital I/O Pins: 54 (of which 14 provide PWM output) Analog Input Pins: 16 DC Current per I/O Pin: 40 mA DC Current for 3.3V Pin: 50 mA Flash Memory: 256 KB of which 8 KB used by the bootloader SRAM: 8 KB EEPROM: 4 KB Clock Speed: 16 MHz CH340 as USB to UART IC USB B type socket for USB power and interface