Iteaduino Leonardo

Overview

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.

Features

• 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

Spec

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

Hardware

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
1	D0	UART DIN	PD2
2	D1	UART DOUT	PD3
3	D2	IIC_SDA	PD1
4	D3	IIC_SCL/PWM	PD0
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.

Download

Datasheet for Iteaduino Leonardo

Schematic for Iteaduino Leonardo

Fritzing Parts for Iteaduino Leonardo

Useful Link

<Fritzing Parts: ITEAD Development Board>