Micro LEONARDO Atmega32u4 5V 16MHz + Micro USB Cable

SKU: FA1020 Tags: , ,
Weight 0.036 kg

Overview

The Micro is a microcontroller board based on the ATmega32U4 (datasheet), developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard.

The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.

Related Boards

If you are looking at upgrading from previous Arduino designs, or if you are just interested in boards with similar functionality, at Arduino you can find:

Getting Started

Find inspiration for your projects from our tutorial platform Project Hub.

You can find in the Getting started with the Arduino Micro section all the information you need to configure your board, use the Arduino Software (IDE), and start tinkering with coding and electronics.

From the Tutorials section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software.

Tech specs

Microcontroller ATmega32U4
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Digital I/O Pins 20
PWM Channels 7
Analog Input Channels 12
DC Current per I/O Pin 20 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega32U4) of which 4 KB used by bootloader
SRAM 2.5 KB (ATmega32U4)
EEPROM 1 KB (ATmega32U4)
Clock Speed 16 MHz
LED_BUILTIN 13
Length 48 mm
Width 18 mm
Weight 13 g

ATmega32U4-Arduino Pin Mapping

A diagram showing the correspondence between the pins on an Arduino board and those of the ATmega32U4 microcontroller.ATmega32U4 pin mapping.

Arduino Leonardo pin mapping table

Pin Number Pin Name Mapped Pin Name
1 PE6 (INT.6/AIN0) Digital pin 7
2 UVcc +5V
3 D- RD-
4 D+ RD+
5 UGnd UGND
6 UCap UCAP
7 VUSB VBus
8 (SS/PCINT0) PB0 RXLED
9 (PCINT1/SCLK) PB1 SCK
10 (PDI/PCINT2/MOSI) PB2 MOSI
11 (PDO/PCINT3/MISO) PB3 MISO
12 (PCINT7/OC0A/OC1C/#RTS) PB7 Digital pin 11 (PWM)
13 RESET RESET
14 Vcc +5V
15 GND GND
16 XTAL2 XTAL2
17 XTAL1 XTAL1
18 (OC0B/SCL/INT0) PD0 Digital pin 3 (SCL)(PWM)
19 (SDA/INT1) PD1 Digital pin 2 (SDA)
20 (RX D1/AIN1/INT2) PD2 Digital pin 0 (RX)
21 (TXD1/INT3) PD3 Digital pin 1 (TX)
22 (XCK1/#CTS) PD5 TXLED
23 GND1 GND
24 AVCC AVCC
25 (ICP1/ADC8) PD4 Digital pin 4
26 (T1/#OC4D/ADC9) PD6 Digital pin 12
27 (T0/OC4D/ADC10) PD7 Digital Pin 6 (PWM)
28 (ADC11/PCINT4) PB4 Digital pin 8
29 (PCINT5/OC1A/#OC4B/ADC12) PB5 Digital Pin 9 (PWM)
30 (PCINT6/OC1B/OC4B/ADC13) PB6 Digital Pin 10 (PWM)
31 (OC3A/#0C4A) PC6 Digital Pin 5 (PWM)
32 (ICP3/CLK0/)0C4A) PC7 Digital Pin 13 (PWM)
33 (#HWB) PE2 HWB
34 Vcc1 +5V
35 GND2 GND
36 (ADC7/TDI) PF7 Analog In 0
37 (ADC6/TDO) PF6 Analog In 1
38 (ADC5/TMS) PF5 Analog In 2
39 (ADC4/TCK) PF4 Analog In 3
40 (ADC1) PF1 Analog In 4
41 (ADC0) PF0 Analog In 5
42 AREF AEF
43 GND3 GND
44 AVCC1 AVCC

Circuit

The circuit.

Programming the Board

In this tutorial, we will be using the Keyboard library, which is already included when downloading the Arduino IDE, or using the Cloud Editor.

Before we begin, let’s take a look at the functions used in this program:

  • Keyboard.press(97)

    – simulates pressing the ‘a’ key.

  • Keyboard.release(97)

    – simulates releasing the ‘a’ key.

The sketch can be found in the snippet below. Upload the sketch to the board.

Note: Remember to choose the right port and board. The board is located under Tools > Board > Arduino AVR boards > Arduino Micro.

#include “Keyboard.h”

//declaring button pins
const int buttonPin = 2;

int previousButtonState = HIGH;

void setup() {
//declare the buttons as input_pullup
pinMode(buttonPin, INPUT_PULLUP);
Keyboard.begin();
}

void loop() {
//checking the state of the button
int buttonState = digitalRead(buttonPin);

//replaces button press with UP arrow
if (buttonState == LOW && previousButtonState == HIGH) {
// and it’s currently pressed:
Keyboard.press(97);
delay(50);
}

if (buttonState == HIGH && previousButtonState == LOW) {
// and it’s currently released:
Keyboard.release(97);
delay(50);
}

previousButtonState = buttonState;

}

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