Iteaduino Leonardo

From ITEAD Wiki
Revision as of 07:33, 20 May 2014 by Ivy (Talk | contribs)

Jump to: navigation, search


Iteaduino Leonardo1.jpg

Iteaduino Leonardo is a microcontroller board based on the ATmega32u4, it's 100% campatible with Arduino Leonardo. It has 20 digital input/output pins, 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 an AC-to-DC adapter or battery to get started.

Iteaduino Leonardo differs from all preceding boards in that the ATmega32u4 has built-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.


  • Efficient DC-DC Power supply with wide range input.
  • 3.3V/5V Operating Voltage selection
  • All pins out for Sensor and Servo
  • UART/IIC interface breakout
  • All electronic brick socket are broken out


Microprocessor ATmega32U4
PCB Size 68.58mm X 58.42mm X 1.6mm
Indicators Power,TX,RX,L
Power supply(recommended) 7-23V DC
Power supply(limits) 23 VDC(max)
Communication Protocol UART,SPI,IIC
Clock Speed 16MHz
RoHS Yes

Electrical Characteristics

Specification Min Type Max Unit
Input voltage 7 - 23 VDC
Operating Voltage - 3.3/5 - VDC
DC Current per I/O Pin - 40 - mA


Iteaduino Leonardo.jpg

Digital/Servo Interface: D0~D13 pin

Sensor Interface: A0 A1 A2 A3 A4 A5 pin

Pin Map

Index Name of Arduino Alternate Function Pin of Atmega32u4
5 D4 External Interrupt 0/A6 PD4
6 D5 External Interrupt 1/PWM PC5
7 D6 PWM PD7
8 D7 A7 PE6
9 D8 A8 PB4
10 D9 PWM/A9 PB5
11 D10 PWM/A10 PB6
12 D11 PWM PB7
13 D12 A11 PD6
14 D13 PWM PC7
15 A0 PF7
16 A1 PF6
17 A2 PF5
18 A3 PF4
19 A4 PF1
20 A5 PF0

Power Supply

The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically.

External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive 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 board can operate on an external supply of 7 to 23 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable.

The power pins are as follows:

  • VIN. The input voltage to the Iteaduino 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 on-board regulator, or be supplied by USB or another regulated 5V supply.
  • 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 250 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 Iteaduino Leonardo.


The ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

Input and Output



Automatic (Software) Reset and Bootloader


USB Over-current Protection

Physical Characteristics


Datasheet for Iteaduino Leonardo

Schematic for Iteaduino Leonardo

Fritzing Parts for Iteaduino Leonardo

Useful Link

<Fritzing Parts: ITEAD Development Board>