Arduino pro micro pinout serial#

The standard 5V Pro Micro runs at 16MHz, and is very comparable to an Arduino Leonardo, while the 3.3V version of the Pro Micro runs at half the speed (to remain in the safe operating zone at the lower voltage) - 8MHz. Pro Micros come in two flavors, which vary by system voltage and operating frequency. A yellow LED represents USB data coming into (RX) the the Pro Micro, and a green LED indicates USB data going out (TX). The other two LEDs help indicate when data is transferring over USB. One red LED indicates whether power is present. If you attach an interrupt to an interrupt-enabled pin, you'll need to know the specific interrupt that pin triggers: pin 3 maps to interrupt 0 (INT0), pin 2 is interrupt 1 (INT1), pin 0 is interrupt 2 (INT2), pin 1 is interrupt 3 (INT3), and pin 7 is interrupt 4 (INT6). The Pro Micro has five external interrupts, which allow you to instantly trigger a function when a pin goes either high or low (or both).

Arduino pro micro pinout serial#

These can be used to interface with digital devices like serial LCDs, XBees, IMUs, and other serial sensors.

There are hardware UART (serial), I 2C, and SPI pins available as well. These pins are indicated on-board with a faint, white circle around them. There are five pins with pulse width modulation (PWM) functionality, which allows for a form of analog output using the analogWrite(, ) function. These are useful for reading potentiometers or other analog devices using the analogRead() function. Nine pins feature analog to digital converters (ADCs) and can be used as analog inputs. (The A0-A3 pins can be referenced digitally using either their analog or digital pin number). These pins are referenced in the Arduino IDE via an integer value between 0 and 21. Every pin can be used as a digital input or output, for blinking LEDs or reading button presses. The Pro Micro's I/O pins - 18 in all - are multi-talented. GND, of course, is the common, ground voltage (0V reference) for the system.The Pro Micro will remain 'off' until the reset line is pulled back to high. This pin is pulled high by a 10k&Ohm resistor on the board, and is active-low, so it must be connected to ground to initiate a reset. RST can be used to restart the Pro Micro.If the board is powered through the 'RAW' pin (or USB), this pin can be used as an output to supply other devices. This voltage is regulated by the voltage applied to the RAW pin.

This voltage will depend on whether you're using a 3.3V/8MHz Pro Micro or a 5V/16MHz version, it'll be either 3.3V or 5V respectively.

VCC is the voltage supplied to the on-board ATmega32U4.

On the other hand, if the board is powered externally, through this pin, the applied voltage can be up to 12V. If the board is powered via USB, the voltage at this pin will be about 4.8V (USB's 5V minus a schottkey diode drop).

RAW is the unregulated voltage input for the Pro Micro.

There are a variety of power and power-related nets broken out: Delving a little further into which pins do what.