Leads from a battery can be inserted in the GND and Vin pin headers of the Arduino. The adapter can be connected by plugging the male jack into the board's female power jack. The Arduino Leonardo can be powered via a micro USB connection or with an external power supply.Įxternal (non-USB) power can come either from an AC-to-DC adapter or battery. The Leonardo varies from the previous boards in that the ATmega32u4 includes a built-in USB connection, removing the need for a secondary processor. It comes with everything you need to support the microcontroller simply connect it to a computer through USB or power it using an AC-to-DC converter or battery to get started. It contains 20 digital I/O pins (seven PWM outputs and twelve analog inputs), a 16 MHz crystal oscillator, a micro USB connector, a power jack, an ICSP header, and a reset button. Reset Pin: Making this pin LOW, resets the microcontroller.ĪTmega32u4 processor. They measure between 0 and 5 volts, although this limit may be raised by utilizing the AREF pin with the analog Reference() function.Īnalog pin 4 (SDA) and pin 5 (SCA) are also used for TWI communication using the Wire library.ĪREF: Used to provide a reference voltage for analog inputs with analogReference() function. In-built LED Pin 13: This pin is connected with a built-in LED, when pin 13 is HIGH – the LED is on and when pin 13 is LOW, it's off.Īlong with 14 digital pins, there are six analog input pins, each of which has a resolution of 10 bits, allowing for a total of 1024 distinct values. SPI Pins 10 (SS), 11 (MOSI), 12 (MISO), and 13 (SCK): These pins are used for SPI communication. PWM Pins 3, 5, 6, 9, 10, and 11: These pins provide an 8-bit PWM output. They are connected with the corresponding ATmega328P USB to TTL serial chip.Įxternal Interrupt Pins 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. Serial Pins 0 (Rx) and 1 (Tx): Rx and Tx pins are used to receive and transmit TTL serial data. Some of these 14 pins have special roles, which are detailed below: It also contains an inbuilt pull-up resistor of 20-50 KOhms that is disconnected by default. Each pin works at 5V and may provide or receive up to 20mA of current. The 14 digital input/output pins can function as both input and output pins. To provide reference voltage for input voltage. Used to receive and transmit TTL serial data.ġ0 (SS), 11 (MOSI), 12 (MISO) and 13 (SCK) 3.3V: 3.3V supply generated by the onboard voltage regulator. The maximum current draw is 50mA. 5V: Regulated power supply used to power microcontroller and other components on the board. Vin: Input voltage to Arduino when using an external power source. The Arduino Uno contains 14 digital I/O pins (six of which can be used as PWM outputs), six analog I/O pins, a USB connection, a power barrel jack, an ICSP header, and a reset button. It includes other components to support the microcontroller, such as a crystal oscillator, serial communication, a voltage regulator, and so on. Today, I'm going to give you an overview of the Difference between Arduino Uno and Arduino Leonardo.Īrduino Uno is a microcontroller board based on an 8-bit ATmega328P microcontroller.
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