source). You can supply voltage through this pin, or if supplying voltage via the

power jack, access it through this pin.



5V. This pin outputs a regulated 5V from the regulator on the 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). Supplying voltage via the 5V

or 3.3V pins bypasses the regulator, and can damage your board if it is not

sufficiently regulated. We don't advise it.



3.3V. A 3.3 volt supply generated by the on-board regulator. Maximum current

draw is 1500 mA. This regulator also provides power to the Curie microcontroller.



GND. Ground pins.



IOREF. This pin on the Arduino board provides the voltage reference with which

the microcontroller operates. 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.

Memory

The Intel Curie module memory is shared between the two microcontrollers, so

your sketch can use 196 kB out of 384 kB (flash memory) and 24 kB out of 80 kB

(SRAM)

Input and Output

Each of the 20 general purpose I/O pins on the 101 can be used for digital input or

digital output using pinMode(), digitalWrite(), and digitalRead() functions. Pins that

can be used for PWM output are: 3, 5, 6, 9 using analogWrite() function. All pins

operate at 3.3 volts. Each pin can source or sink a maximum of 4 mA.

In addition, some pins have specialized functions:



Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data.

These pins are connected to the Serial1 class.



External Interrupts on all pins. Can trigger an interrupt on a low value, high value, a

rising or falling edge, or a change in value (change is only supported by pins 2, 5, 7,

8, 10, 11, 12, 13). See the attachInterrupt() function for details.



PWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with

the analogWrite() function.