A000057

A000057 Datasheet

Code A000057

Part	Datasheet
A000057	A000057 (pdf)

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ARDUINO LEONARDO WITH HEADERS Code A000057 Similar to an Arduino UNO, can be recognized by computer as a mouse or keyboard. The Arduino Leonardo is a microcontroller board based on the ATmega32u4 datasheet . 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, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a adapter or battery to get started. The Leonardo differs from all preceding boards in that the ATmega32u4 has in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual CDC serial / COM port. It also has other implications for the behavior of the board these are detailed on the getting started page. TECH SPECS Microcontroller Operating Voltage Input Voltage Recommended Input Voltage limits Digital I/O Pins PWM Channels Analog Input Channels DC Current per I/O Pin DC Current for 3.3V Pin Flash Memory SRAM EEPROM Clock Speed Lenght Width Weight ATmega32u4 5V 20 7 12 40 mA 50 mA 32 KB ATmega32u4 of which 4 KB used by bootloader KB ATmega32u4 1 KB ATmega32u4 16 MHz mm 20 g OSH Schematics The Arduino Leonardo is hardware! You can build your own board using the following files EAGLE FILES IN .ZIP SCHEMATICS IN .PDF Power The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. External power can come either from an adapter or battery. The adapter can be connected by plugging a 2.1mm plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The power pins are as follows: VIN. The input voltage to the Arduino board when it's using an external power source as opposed to 5 volts from the USB connection or other regulated power source . You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an regulator, or be supplied by USB or another regulated 5V supply. 3V3. A volt supply generated by the regulator. Maximum current draw is 50 mA. GND. Ground pins. IOREF. The voltage at which the i/o pins of the board are operating i.e. VCC for the board . This is 5V on the Leonardo. Memory The ATmega32u4 has 32 KB with 4 KB used for the bootloader . It also has KB of SRAM and 1 KB of EEPROM which can be read and written with the EEPROM library . Input and Output Each of the 20 digital i/o pins on the Leonardo can be used as an input or output, using pinMode digitalWrite and digitalRead functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal resistor disconnected by default of kOhms. In addition, some pins have specialized functions: Serial 0 RX and 1 TX . Used to receive RX and transmit TX TTL serial data using theATmega32U4 hardware serial capability. Note that on the Leonardo, the Serial class refers to USB CDC communication for TTL serial on pins 0 and 1, use the Serial1 class. TWI 2 SDA and 3 SCL . Support TWI communication using the Wire library. External Interrupts 3 interrupt 0 , 2 interrupt 1 , 0 interrupt 2 , 1 interrupt 3 and 7 interrupt These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt function for details. PWM 3, 5, 6, 9, 10, 11, and Provide PWM output with the analogWrite function. SPI on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a ICSP connector that connects to the Leonardo's ICSP header, the shield will not work. LED There is a LED connected to digital pin When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. Analog Inputs A6 A11 on digital pins 4, 6, 8, 9, 10, and The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins appear in the same locations as on the Uno inputs are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution i.e. 1024 different values . By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference function. There are a couple of other pins on the board: AREF. Reference voltage for the analog inputs. Used with analogReference . Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board. See also the mapping between Arduino pins and ATmega32u4 ports. Communication The Leonardo has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL 5V serial communication, which is available on digital pins 0 RX and 1 TX . The 32U4 also allows for serial CDC communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB device, using standard USB COM drivers. On Windows, a .inf file is required. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer but not for serial communication on pins 0 and A SoftwareSerial library allows for serial communication on any of the Leonardo's digital pins. The ATmega32U4 also supports I2C TWI and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus see the documentation for details. For SPI communication, use the SPI library. The Leonardo appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes.

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ARDUINO LEONARDO WITH HEADERS

Code A000057

Similar to an Arduino UNO, can be recognized by computer as a mouse or keyboard.

The Arduino Leonardo is a microcontroller board based on the ATmega32u4 datasheet . 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, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a adapter or battery to get started.

The Leonardo differs from all preceding boards in that the ATmega32u4 has in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual CDC serial / COM port. It also has other implications for the behavior of the board these are detailed on the getting started page.

TECH SPECS

Microcontroller Operating Voltage Input Voltage Recommended Input Voltage limits Digital I/O Pins PWM Channels Analog Input Channels DC Current per I/O Pin DC Current for 3.3V Pin

Flash Memory

SRAM EEPROM Clock Speed Lenght Width Weight

ATmega32u4 5V
20 7 12 40 mA 50 mA 32 KB ATmega32u4 of which 4 KB used by bootloader KB ATmega32u4 1 KB ATmega32u4 16 MHz mm 20 g

OSH Schematics

The Arduino Leonardo is hardware! You can build your own board using the following files EAGLE FILES IN .ZIP

SCHEMATICS IN .PDF

Power

The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. External power can come either from an adapter or battery. The adapter can be connected by plugging a 2.1mm plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector.

The power pins are as follows:

VIN. The input voltage to the Arduino board when it's using an external power source as opposed to 5 volts from the USB connection or other regulated power source . You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an regulator, or be supplied by USB or another regulated 5V supply.
3V3. A volt supply generated by the regulator. Maximum current draw is 50 mA.

GND. Ground pins.

IOREF. The voltage at which the i/o pins of the board are operating i.e. VCC for the board . This is 5V on the Leonardo.

Memory

The ATmega32u4 has 32 KB with 4 KB used for the bootloader . It also has KB of SRAM and 1 KB of EEPROM which can be read and written with the EEPROM library .

Input and Output

Each of the 20 digital i/o pins on the Leonardo can be used as an input or output, using pinMode digitalWrite and digitalRead functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal resistor disconnected by default of kOhms. In addition, some pins have specialized functions:

Serial 0 RX and 1 TX . Used to receive RX and transmit TX TTL serial data using theATmega32U4 hardware serial capability. Note that on the Leonardo, the Serial class refers to USB CDC communication for TTL serial on pins 0 and 1, use the Serial1 class.

TWI 2 SDA and 3 SCL . Support TWI communication using the Wire library.

External Interrupts 3 interrupt 0 , 2 interrupt 1 , 0 interrupt 2 , 1 interrupt 3 and 7 interrupt These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt function for details.

PWM 3, 5, 6, 9, 10, 11, and Provide PWM output with the analogWrite function.

SPI on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a ICSP connector that connects to the Leonardo's ICSP header, the shield will not work.

LED There is a LED connected to digital pin When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.

Analog Inputs A6 A11 on digital pins 4, 6, 8, 9, 10, and The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins appear in the same locations as on the Uno inputs are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution i.e. 1024 different values . By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference function.

There are a couple of other pins on the board:

AREF. Reference voltage for the analog inputs. Used with analogReference .

Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

See also the mapping between Arduino pins and ATmega32u4 ports.

Communication

The Leonardo has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL 5V serial communication, which is available on digital pins 0 RX and 1 TX . The 32U4 also allows for serial CDC communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB device, using standard USB COM drivers. On Windows, a .inf file is required. The

Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer but not for serial communication on pins 0 and A SoftwareSerial library allows for serial communication on any of the Leonardo's digital pins. The ATmega32U4 also supports I2C TWI and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus see the documentation for details.

For SPI communication, use the SPI library. The Leonardo appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes.

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Datasheet ID: A000057 518292