Serial: 0 (RX) and 1 (TX). 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. Input and Output :Įach of the 14 digital pins on the Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library). The ATmega328 has 32 KB (with 0.5 KB used for the bootloader). A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V. IOREF. This pin on the Arduino board provides the voltage reference with which the microcontroller operates.3V3. A 3.3 volt supply generated by the on-board regulator. ![]() Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. The board can be supplied with power either from the DC power jack (7 – 12V), the USB connector (5V), or the VIN pin of the board (7-12V).
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