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CentIoT - Pro Mini ATMega328P - 3.3V 8MHz
•Microcontroller ATmega328P
•Board Power Supply: 6 - 12 V
•Circuit Operating Voltage: 3.3V; Check the backside of board for voltage marking.
•To find the model, supply RAW pin with 6V-12V and measure using multimeter the VCC voltage (5V = 5V, 3.3V = 3.3V)
•Flash Memory: 32KOne GND pins to the GND of the power source and one GND pins to the GND of the multimeter (you can take any of the Arduin pins labeled with GND)B (ATmega328) (of which 2 KB used by bootloader) SRAM: 2KB (ATmega328) EEPROM: 1KB (ATmega328) Clock Speed: 16MHz USB to Serial Converter: CH340