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. The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. There is a built-in LED connected to digital pin 13. 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. These pins support SPI communication using the SPI library. Provide 8-bit PWM output with the analogWrite() function. See the attachInterrupt() function for details. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. Support TWI communication using the Wire library.
#Arduino leonardo led serial#
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. Used to receive (RX) and transmit (TX) TTL serial data using the ATmega32U4 hardware serial capability. In addition, some pins have specialized functions: 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.
It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).Įach of the 20 digital i/o pins on the Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. The ATmega32u4 has 32 KB (with 4 KB used for the bootloader).
The voltage at which the i/o pins of the board are operating (i.e.
A 3.3 volt supply generated by the on-board regulator. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply. 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). If using more than 12V, the voltage regulator may overheat and damage the board. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. The board can operate on an external supply of 6 to 20 volts. 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. Schematic: arduino-leonardo-schematic-rev3b.pdf It also has other implications for the behavior of the board these are detailed on the getting started page.ģ2 KB ( ATmega32u4) of which 4 KB used by bootloaderĮAGLE files: arduino-leonardo-reference-design.zip 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. The Arduino Leonardo is a microcontroller board based on the ATmega32u4 ( datasheet).
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