Arduino Leonardo R3 Compatible with Extra I/O Connections
The Arduino Leonardo still lives thanks to the open-source design, and PMD Way has you covered with a range of boards. Leonardos are popular as along with being a useful development board, they can also emulate a USB HID (Human Interface Device) - such as a keyboard or mouse.
We love this Leonardo-compatible as is has plenty of extra I/O connections. As you can see from the images above, all the I/O pins are connected to parallel rows of power, I/O and GND lines along the stacking headers.
This allows you to easily connect servos, sensors and other devices via useful jumper cables. Furthermore, the I2C and serial data lines are also connected to inline pins on the right-hand side of the board.
The Arduino Leonardo is a microcontroller board based on the ATmega32u4. 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. 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.
The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the getting started page.
This version of the Leonardo comes assembled and requires a micro USB cable.
|Input Voltage (recommended)||7-12V|
|Input Voltage (limit)||6-20V|
|Digital I/O Pins||20|
|PWM Digital I/O Pins||7|
|Analog Input Pins||12|
|DC Current per I/O Pin||40 mA|
|DC Current for 3.3V Pin||50 mA|
|Flash Memory||32 KB|
|Flash Memory for Bootloader||4 KB|
|Clock Speed||16 MHz|