The regulated power supply used to power the microcontroller and other components on the board. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. 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). Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. The power source is selected automatically.Įxternal (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. You can find here your board warranty information. Need any help with your board please get in touch with the official Arduino User Support as explained in our Contact Us page. Need Help?Ĭheck the Arduino Forum for questions about the Arduino Language, or how to make your own Projects with Arduino. The Getting started with the Arduino Leonardopage contains all the information you need to configure your board, use the Arduino Software (IDE), and start tinkering with coding and electronics.įrom the Tutorials section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software. If you are interested in boards with similar functionality, at Arduino you can find:įind inspiration for your projects with Leonardo board from our tutorial platform Project Hub. It also has other implications for the behavior of the board these are detailed on the Getting started with the Arduino Leonardo. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. 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. There is also a tutorial here although I found it a bit complex when getting started.The Arduino Leonardo is a microcontroller board based on the ATmega32u4 ( datasheet). Waiting for the first SOF.Īll tests passed. Reset number 99 Time to stabilize - 319 cycles Reset number 2 Time to stabilize - 318 cycles Reset number 1 Time to stabilize - 318 cycles Reset number 0 Time to stabilize - 318 cycles Connect GPIN0 to GPOUT7, GPIN1 to GPOUT6, and so on The serial console output should look like this. In the IDE, File | Examples | USB Host Library 2.0 | board_qc. If the reader still does not work, run the board_qc program. Ideally, use a 9V 1A power supply with the correct connector and polarity. The solution is to plug in power via the Uno's barrel connector. USB devices such as barcode readers and RFID readers, draw hundreds of mA so may fail when the Uno is powered via its USB connector. This must power the Uno, the USB host shield, and the barcode reader. When the Uno is powered via USB, it has access to at most 500 mA from the USB connector. If it does not work the problem may be a lack of power. StartĪssuming everything works so far, unplug the keyboard and plug in the barcode reader. This shows what happens when the '=' key is pressed. In the IDE, File | Examples | USB Host Library 2.0 | HID | USBHIDBootKbd. To get USB keyboard input, run the USBHIDBootKbd example. In the IDE, use the library manager to install "USB Host Shield Library 2.0 by Oleg Mazurov, et al.". It is best to start with a simple USB device such as a keyboard to make sure the Uno and the shield are working. Plug a USB keyboard into the USB host shield.
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