Details:
Arduino Leonardo is a microcontroller board based on ATmega32u4. It has 20 digital input / output pins (of which 7 can be used for PWM outputs, 12 analog inputs can be used), a 16 MHz crystal oscillator, a Micro USB port, a DC jack, an ICSP interface, a reset button. It contains everything needed to support the microcontroller and you can simply connect it to your computer via the USB port, or use AC-DC adapter or battery again to drive it.
Unlike all previous Leonardo arduino controller, he used the ATmega32u4 direct USB communication capabilities, eliminating the USB-to-UART chip. This makes it not only as a virtual Leonardo's (CDC) serial / COM port, but also can be used as a mouse or keyboard is connected to the computer. It also has a lot of different places, we will introduce in the entry page.
Arduino Leonardo by Micro
Interface or an external power supply. Power supply can be selected automatically.
External (non-USB) power supply can be used AC-DC adapter (wall-wart) or battery. Adapter can be plugged into a standard 2.1 mm center positive power outlet, in order to connect to the controller power supply. The information from the battery, you can plug in the power connector
GND and VIN pin head.
Can enter 6V-20V external power source. However, if less than 7V, 5V pin will provide less than 5V power, the control panel may be unstable. If you use more than 12V power regulator may overheat and damage the circuit board. The recommended range is 7V-12V.
Power supply pin as follows:
VIN using an external power source (not from the USB connection or other regulated power input 5V). You can provide the voltage through this pin, or by using the power seat of the pin input voltage.
5V regulated power supply circuit board is a microcontroller and other components used in power supplies. From VIN input via on-board regulator, or via USB or other 5V regulated power supply.
3V3-board regulator generates a 3.3V power supply. The maximum current is 50 mA.
GND Ground pin.
IOREF voltage board I / O pins work (connected to the board VCC, the Leonardo for the 5V).
Memory
ATmega32u4 has 32KB of Flash (which 4KB used by bootloader). It also has 2.5KB of SRAM and 1KB of EEPROM (EEPROM EEPROM read and write can be found in libraries).
Input and Output
By using pinMode (), digitalWrite (), and digitalRead () function, Leonardo the 20 I / O pins in each can be used as input and output ports. Each pin has a 20-50 kohm internal matter resistor (default off), you can output or input maximum 40ma of current. Also part of the pin and special features:
UART: 0 (RX) and 1 (TX) using ATmega32U4 hardware serial ports for receive (RX) and transmit (TX) a TTL serial data. Note that, Leonardo, the Serial category refers to USB (CDC) communications, and pin 0 and 1 TTL serial port to use Serial1 classes.
TWI: 2 (SDA) and 3 (SCL) by using the Wire library to support TWI communication.
External interrupts: 2 and 3, these pins can be configured
PWM: 3,5,6,9,10,11,13 can use analogWrite () function supports 8-bit PWM output.
SPI: ICSP pin. Through support SPI communication using the SPI library. Note that, SPI pin is not connected to any of the UNO as digital I / O pins, they can only work on the ICSP port. This means that if your expansion board is not connected 6 pin ICSP pin, then it will not work.
LED: 13. There is a built-in LED on the digital pin 13, when the pin is high things, LED lights, when the pin is low, LED is not lit.
Analog input: A0 ~ A5, A6 ~ A11 (digital pins 4,6,8,9,10,12), Leonardo has 12 analog inputs, A0 to A11, can be used as digital I / O port. Pin A0-A5 with the UNO same position; A6-A11, respectively, the digital I / O pins 4,6,8,9,10 and 12. Each analog input has 10-bit resolution (ie 1024 different values). By default, the analog input is 0-5V, AREF pin can also change this limit.
ARDUINO Introduction
Arduino is a convenient and flexible, easy to use open-source electronics prototyping platform, including hardware (various models arduino board) and software (arduino IDE). It is suitable for artists, designers, hobbyists, and for the "Interactive" Interested friends.
Arduino through a variety of sensors to sense the environment by controlling lights, motors and other devices to feedback, affect the environment. Microcontroller on the board through the Arduino programming language to write programs, compiled into a binary file, burn into the microcontroller is programmed using the Arduino Arduino programming language (based on Wiring) and the Arduino development environment (based on Processing) to achieved. Arduino-based items, may contain only Arduino, Arduino, and can also contain some other software running on a PC, for communication between them (eg Flash, Processing, MaxMSP) to achieve.
You can own it yourself, you can also buy product suite; Arduino to use software can be downloaded for free. Hardware reference designs (CAD files) also follow availableopen-source protocol, you can quite freely according to your own requirements to modify them.
Arduino developed can be used for electronic components such as sensors or other controllers, or Switch, LED, stepper motors, or other output device. Arduino can also operate as an independent software can communicate with the interface, for example, said: flash, processing, Max / MSP, VVVV ... or other interactive software. Arduino IDE interface is based on open source developers original, allowing you to download free to develop more stunning interactive work.
ARDUINO Features
1, open source schematic design, programming interface free download, also follow their own needs modification.
2, the use of low-cost microprocessor controller (AVR series controller), you can use the USB interface powered, no external power supply, you can also use an external 9VDC input.
3, Arduino ISP online support burning, can be a new "bootloader" firmware burned into the AVR chip. With the bootloader, you can through the serial port or USB to Rs232 cable to update the firmware.
4, can be based on the official form provided by Eagle PCB and SCH simplified schematic Arduino module operates independently complete microprocessor control; may be simply the sensor, a wide range of electronic components connected (example: infrared, ultrasonic, thermal , light dependent resistor, servo motors, ... etc.)
5, support a variety of interactive programs, such as: Flash, Max / Msp, VVVV, PD, C, Processing and so on.
6, applications using Arduino, a breakthrough in the past can only use the mouse, keyboard, CCD input devices such as interactive content, you can more easily reach a single or multiplayer interactive games.
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