Arduino Pro Mini Atmega328
Board Power Supply: 6 - 12 V
Circuit Operating Voltage: 3.3V; Check the backside of the board for voltage marking.
To find the model, supply RAW pin with 6V-12V and measure using multi-meter the VCC voltage (5V = 5V Arduino, 3.3V = 3.3V Arduino)
One GND pins to the GND of the power source and one GND pins to the GND of the multimeter ...
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