The analog inputs measure from ground to VCC. Four of them are on the headers on the edge of the board two (inputs 4 and 5) are on holes in the interior of the board. The Pro Mini has 8 analog inputs, each of which provides 10 bits of resolution (i.e. Typically used to add a reset button to shields which block the one on the board. Reset: Bring this line LOW to reset the microcontroller.Support I2C (TWI) communication using the Wire library. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off. There is a built-in LED connected to digital pin 13. These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language. Provide 8-bit PWM output with the analogWrite function. See the attachInterrupt function for details. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. These pins are connected to the TX-0 and RX-1 pins of the six-pin header. Used to receive (RX) and transmit (TX) TTL serial data. In addition, some pins have specialized functions: Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. It has 2 kB of SRAM and 1kBs of EEPROM (which can be read and written with the EEPROM library.Įach of the 14 digital pins on the Pro Mini can be used as an input or output, using pinMode, digitalWrite, and digitalRead functions. The ATmega328 has 32 kB of flash memory for storing code (of which 0.5kB is used for the bootloader). If you’re supplying unregulated power to the board, be sure to connect to the “RAW” pin, not VCC. There is a voltage regulator on board so it can accept voltage up to 6VDC. The Arduino Pro Mini can be powered with an FTDI or CH340G cable or breakout board connected to its six-pin header, or with a regulated 3.3V supply on the Vcc pin.
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