The SPDuino is a clone of Arduino Mainboard with ATMEGA328 (Uno Bootloader). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a 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. This board can be powered via the USB connection or with an external power supply. The power source is selected automatically using auto reselect circuit.

Features:

• 100% Arduino (Uno)-compatible board

• Direct USB interface, no extra converters are required

• Comes with Atmega328 for more memory

• Auto select the power source (from USB cable or battery)

Specifications:

Microcontroller	ATmega328
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limits)	6-17V
Digital I/O Pins	14 (of which 6 provide PWM output)
Analog Input Pins	6
DC Current per I/O Pin	40 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	32 KB (ATmega328) of which 2 KB used by bootloader
SRAM	2 KB (ATmega328)
EEPROM	1 KB (ATmega328)
Clock Speed	16 MHz