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The Iteaduino Leonardo is a microcontroller board based on the ATmega32u4, it's 100% compatible 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.

The 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

Power Supply:

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).

Input and Output:

Each of the 20 digital i/o pins on the Iteadino can be used as an input or output, using pinMode(), digitalWrite(), anddigitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 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 the ATmega32U4hardware 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 2 and 3. 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 13. Provide 8-bit 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 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work.
• LED13 There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
• Analog Inputs A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provides 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.

Programming:

The Iteaduino Leonardo can be programmed with the Arduino software . Select "Arduino Leonardo" from the Tools > Board menu .

Der ATmega32u4 auf dem Iteaduino Leonardo kommt mit einem vorinstalliereten Bootloader welcher das Heraufleden von neuem Code ohne externe Hardware erlaubt. Der Bootloader kommuniziert mit dem AVR109 Protokoll.

Sie können den Mikrokontroller auch über den ICSP (In-Circuit Serial Programming) Header programmieren, ohne Verwendung des Bootloaders.

Spezifikation:

• Mikrokontroller: ATMega32u4
• Max Frequenz: 16MHz
• RAM Kapazität: Nein
• FLASH Kapazität: 32K
• Externe Anschlüsse: Electronic Brick Interface
• Stromversorgung
  • Extern 12V
  • Extern 7V
  • Extern 9V
  • USB 5V
• I/O Pegel
  • 3.3V
  • 5V
• Board Grösse: 68mm x 58.5mm
• Model: IM120724001
• Version: 1.0
• Gewicht: 50.0g
• Zubehör: No

Dokumente:

• Schema
• Datenblattt
• Datenblatt ATmega32u4