Overview:

The Sainsmart Uno R3 is a microcontroller board based on the ATmega328 . It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, 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.

*Battery is NOT included in the Real Time Clock Model

Revision 3 of the board has the following new features:

1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Sainsmart Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.

Microcontroller	ATmega328P-PU
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limits)	6-20V
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 0.5 KB used by bootloader
SRAM	2 KB (ATmega328)
EEPROM	1 KB (ATmega328)
Clock Speed	16 MHz

Data comes from [link removed by eBay]

	ATmega328P-PU	ATmega8A-PU
Flash (Kbytes)	32 Kbytes	8 Kbytes

Pin Count	32	32

Max. Operating Freq. (MHz)	20 MHz	16 MHz

CPU	8-bit AVR	8-bit AVR

# of Touch Channels	16	12

Max I/O Pins	23	23

Ext Interrupts	24	2

SPI	2	1

TWI (I2C)	1	1

UART	1	1

ADC channels	8	8

ADC Resolution (bits)	10	10

ADC Speed (ksps)	15	15

Analog Comparators	1	1

Resistive Touch Screen	No	No

DAC Resolution (bits)	0	0

Temp. Sensor	Yes	No

Crypto Engine	No	No

SRAM (Kbytes)	2	1

EEPROM (Bytes)	1024	512

Self Program Memory	YES	YES

External Bus Interface	0	0

DRAM Memory	No	No

NAND Interface	No	No

picoPower	Yes	No

FPU	No	No

Timers	3	3

Output Compare channels	6	3

Input Capture Channels	1	0

PWM Channels	6	3

32kHz RTC	Yes	Yes

Calibrated RC Oscillator	Yes	Yes

Watchdog	Yes	Yes

	Sainsmart Uno R3	Sainsmart Uno R3 Improved Version
Picture review (Click the picture for the Item)
Microcontroller	ATmega328	MEGA328P-AU
Operating Voltage	5V	3.3V-5V (Switch)
Input Voltage (recommended)	7-12V	7-12V
Input Voltage (limits)	6-20V	6-20V
Digital I/O Pins	14 (of which 6 provide PWM output)	14 (of which 6 provide PWM output)
Analog Input Pins	6	8 (Add A6/A7 port)
DC Current per I/O Pin	40 mA	40 mA
DC Current for 3.3V Pin	50 mA	50 mA
Flash Memory	32 KB (ATmega328) of which 0.5 KB used by bootloader	32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM	2 KB (ATmega328)	2 KB (ATmega328)
EEPROM	1 KB (ATmega328)	1 KB (ATmega328)
Clock Speed	16 MHz	16 MHz

	Trade_spotting	Other Sellers
Core Chip	Atmega 16U2, ATmega328P-PU, 100% Imported from Atmel	Clone Chips are made from China
Technical Support	We have our own team to supply you the technology support	None
Service	To provide design, pre-sales and transportation logistics and distribution service	Cruddy service
Tracking	We will upload the tracking number after your purchase within 1 Biz day	Order more than $30
Expedited Shipping	We will update the Economy to Expedited Shipping via DHL / UPS/ EMS.. without additional fee for more than 20 PCS	None
Warranty	2 year warranty, 60 days return/exchange	None
Logistics	We have 2 warehouses China, 5 on North America and 8 on European Union	Only China

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1.Item will be shipped within 1-2 working days after full payment is cleared. Tracking number will be sent to all customers upon package shipment.

2.Delivery time is different in accordance to shipping address and shipping methods.

-Economy shipping from China: about 20-30 biz days.
-ePacket delivery (EUB) from China to US: about 10-15 biz days.
-Expedited shipping from China takes about 3-5 biz days via DHL/UPS and 9-15 biz days via EMS.

-Standard shipping (Royal Mail Tracked) from UK warehouse to local customers: about 3-5 biz days.

-Standard shipping from US warehouse: about 3-7 biz days.
-Expedited shipping from US warehouse: about 3-5 biz days.

3.Delivery time depends on destination,logistics mode and other factors. If you have not received your shipment within 30 days from payment, please feel free to contact us. We will track the shipment and get back to you as soon as possible with a reply. Customer`s satisfaction is our goal.

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1.60 days money back return policy. If you are not satisfied when you聽receive your item, please return it within 60 days for a replacement or money back. Please contact us for return address before you send it back.

2. If item defective,

in 3 months we will send you a replacement without extra charge, or offer refund upon faulty received.

after 3 months you are still welcomed to send it back to us for exchange.

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