Leonardo R3 Development Board ATMEGA32U4
For Arduino, with USB to Micro USB cable.
Keyestudio Leonardo R3 is a microcontroller board based on the ATmega32u4 (datasheet). It is an easy-to-use open source hardware.
It has 20 digital input/output pins (of which 7 can be used as PWM outputs), 12 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.
Note that ICSP (In-Circuit Serial Programming) header can not only program the firmware to Atmega32u4, but also be used as SPI communication interface.
The keyestudio Leonardo can be powered via the micro USB connection, or via an external power supply jack (DC 7-12V) or even with female headers Vin /GND (DC 7-12V).
The Leonardo differs from other Arduino boards using separate USB-Serial chip 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.
Microcontroller:ATmega32u4
Operating Voltage:5V
Input Voltage (recommended):7-12V
Input Voltage (limits):6-20V
Digital I/O Pins:20
PWM Channels:7
Analog Input Channels:12
DC Current per I/O Pin:40 mA
DC Current for 3.3V Pin:50 mA
Flash Memory:32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM:2.5 KB (ATmega32u4)
EEPROM:1 KB (ATmega32u4)
Clock Speed:16 MHz
