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  1. Parts
  2. /Interfaces
  3. /Breakout Boards

Arduino Leonardo ATmega32u4 without headers

OverviewPinoutWiringRelated groups
Arduino Leonardo ATmega32u4 without headers — Adafruit — 883

Note: This product is discontinued, but you can purchase the Seeeduino Lite, which is an equivalent alternative that can be used instead.

Offers

  • Adafruit$22.50

Offers

  • Adafruit$22.50

Pinout

  • Digital I/O D0-D13

    Arduino Leonardo board digital input/output header pins; Arduino states the Leonardo has 20 digital input/output pins total.

    Type · digital ioVoltage · Logic level 5V board; input voltage and operating voltage sourced from Arduino store specifications.
  • PWM D3, D5, D6, D9, D10, D11, D13

    Seven digital pins can be used as PWM outputs according to Arduino Leonardo specifications.

    Type · pwmVoltage · 5V logic board
  • Analog inputs A0-A5 and D4/D6/D8/D9/D10/D12 as A6-A11

    Twelve analogue input channels are available on the Leonardo board.

    Type · analog inputVoltage · 5V logic board
  • I2C SDA/SCL

    Board exposes I2C/TWI communication via the Leonardo header; Arduino documentation describes I2C/TWI support.

    Type · i2cVoltage · 5V logic board
  • SPI / ICSP header

    SPI communication is available through the ICSP header on Leonardo.

Start wiring

PWM · I2S · I2C · Logic level 5V board; input voltage and operating voltage sourced from Arduino store specifications. · 5V logic board

Confirm the data interface matches your host board.

Module pins: Power jack / VIN, 5V, 3.3V, GND, PWM D3, D5, D6, D9, D10, D11, D13, I2C SDA/SCL, SPI / ICSP header. Schematik maps them to your board in the app.

Related groups

4 groups
SparkFun Qwiic Pro Micro BoogieBoard visual preview
9V to Barrel Jack Adapter visual preview
SparkFun 16x2 SerLCD - RGB Backlight (Qwiic) visual preview
MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter | Kiwi Electronics visual preview

Connectors

Sort passive connector adapters from Qwiic boards, LCD modules and microSD card adapters before assuming anything with the right plug will substitute safely.

Connectors & cables · Connectors · 28 parts

RGB backlight positive LCD 16x2 visual preview
SparkFun 16x2 SerLCD - RGB Backlight (Qwiic) visual preview
I2C 20x4 Arduino LCD Display Module visual preview
Gravity: I2C 16x2 Arduino LCD with RGB Backlight Display V2.0 visual preview

Displays

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 35 parts

MQ-2 Gas Sensor visual preview
MQ-3 Gas Sensor visual preview
MQ-135 Gas Sensor visual preview
Grove - Air quality sensor visual preview

Air quality

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 31 parts

Arduino Uno visual preview
Raspberry Pi Pico visual preview
Adafruit Feather nRF52840 Express visual preview
Pan-Tilt HAT kit visual preview

MCUs and boards

ESP32, Arduino Uno, Raspberry Pi Pico, and compatible add-on boards for running builds.

Boards · Microcontroller boards · 27 parts

Parts tray full · 5 max · remove a part to add another
Type · spiVoltage · 5V logic board
  • Micro USB

    Micro USB connection used for programming, serial/USB HID, and board power.

    Type · usbVoltage · USB 5V input
  • Power jack / VIN

    External power input through the board power jack or VIN rail.

    Type · powerVoltage · Recommended input voltage 7-12V; limits 6-20V per Arduino store specifications.
  • 5V

    Regulated 5V board rail.

    Type · powerVoltage · 5V
  • 3.3V

    3.3V output rail; Arduino store specifies 50 mA DC current for the 3.3V pin.

    Type · powerVoltage · 3.3V, 50 mA max
  • GND

    Board ground pins.

    Type · groundVoltage · 0V reference
  • RESET

    Reset pin/button resets the ATmega32u4 board.

    Type · reset
  • AREF

    Analogue reference pin for ADC reference voltage.

    Type · analog reference
  • PinPositionTypeFunctionVoltage
    Digital I/O D0-D13digital ioArduino Leonardo board digital input/output header pins; Arduino states the Leonardo has 20 digital input/output pins total.Logic level 5V board; input voltage and operating voltage sourced from Arduino store specifications.
    PWM D3, D5, D6, D9, D10, D11, D13pwmSeven digital pins can be used as PWM outputs according to Arduino Leonardo specifications.5V logic board
    Analog inputs A0-A5 and D4/D6/D8/D9/D10/D12 as A6-A11analog inputTwelve analogue input channels are available on the Leonardo board.5V logic board
    I2C SDA/SCLi2cBoard exposes I2C/TWI communication via the Leonardo header; Arduino documentation describes I2C/TWI support.5V logic board
    SPI / ICSP headerspiSPI communication is available through the ICSP header on Leonardo.5V logic board
    Micro USBusbMicro USB connection used for programming, serial/USB HID, and board power.USB 5V input
    Power jack / VINpowerExternal power input through the board power jack or VIN rail.Recommended input voltage 7-12V; limits 6-20V per Arduino store specifications.
    5VpowerRegulated 5V board rail.5V
    3.3Vpower3.3V output rail; Arduino store specifies 50 mA DC current for the 3.3V pin.3.3V, 50 mA max
    GNDgroundBoard ground pins.0V reference
    RESETresetReset pin/button resets the ATmega32u4 board.
    AREFanalog referenceAnalogue reference pin for ADC reference voltage.