User manual

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supply voltage through this pin, or, if supplying voltage via the power jack, access it through

this pin.

2. AREF. Reference voltage for the analog inputs. Used with analogReference().

SainSmart UNO R3

What’s UNO R3?

The Arduino Uno 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.

Performance

Revision 3 is the last SainSmart UNO development board version.

Parameter

 3.3V/5V Supply Voltage and IO Voltage can be switched at the same time.

 More 3.3V modules supported, such as Xbee module, Bluetooth module, RF module, GPRS

module, GPS module, LCD5110 Backlight and so on, but the original version can only support

5V IO.

 Controller uses SMD MEGA328P-AU chip. Add A6/A7 port.

 5V Electric current : 500MA

 3.3V Electric current : 50MA

 Input Voltage: 7-12V

Improvement of R3

 Working voltage 3.3V/5V is optional.

 Arduino can only work at 5V voltage. When it comes to 3.3V Level module, IO can’t be

connected to it. The Level should be changed, like the SD card, Bluetooth module and so on.

 Sainsmart UNO R3 can work at 3.3V voltage by switching on the button. At this time, IO port

is 3.3V and it can work with 3.3V Level module. (R3 can directly use the electronic building

blocks on I / O port and elicit G, V, S)

SainSmart MEGA2560 R3

Description:

This is the new MEGA2560 R3. In addition to all the features of the previous board, the MEGA

now uses an ATMega16U2 instead of the ATMega8U2 chip. This allows for faster transfer rates

and more memory. No drivers needed for Linux or Mac (inf file for Windows is needed and

included in the Arduino IDE), and the ability to have the Uno show up as a keyboard, mouse,