Small (48mm x 18mm), robust and powerful board Based on the ATMega4809 AVR processor Clock 20MHz, Flash 48KB, SRAM 6KB, EEPROM 256byte. t and powerful board Based on the ATMega4809 AVR processor Clock 20MHz, Flash 48KB, SRAM 6KB, EEPROM 256byte. Power supply architecture based on a high efficiency DC-DC converter allows powering the board at up to 21V and to drive output peripherals with up to 950mA without overheating. Get started in minutes with thousands of sketches available in open source