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Product: SunFounder R3 Board for Arduino ATMEGA328P ATMEGA16U2 Technical Details:
Microcontroller: ATmega328
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

Package included:
1x SunFounder R3 (compatible for Arduino )
For more information, please view at
http://wiki.sunfounder.cc/index.php?title=Main_Page R3 board compatible with Arduino
The board for Arduino use ATMEGA16U2 chip, Faster transfer rates and more memory
Control using r3 ATmega328P chip
Includes new pin configuration (SCL, SDA, IOREF)
Clearly print on the female header connector, more precise and easier to use the wire SunFounder R3

Product: Arduino UNO WiFi REV2 [ABX00021] Add WiFi to your devices with the Arduino Uno WiFi. It's basically an Arduino Uno with more kick: It comes with an 8-bit microprocessor from Microchip, and an onboard IMU (Inertial Measurement Unit). The WiFi connection is made secure with the new ECC608 crypto chip accelerator. The Wi-Fi Module is a self-contained SoC with integrated TCP/IP protocol stack that can provide access to a Wi-Fi network, or act as an access point. The easiest way to build a connected Arduino project. Works for WiFi and Bluetooth Low Energy applications.
Safe wireless connection to the Internet thanks to its onboard cryptochip.
Ideal for IoT (Internet of Things) industries such as automotive, agriculture, consumer electronics, smart home projects, or logging data.
Includes a 6 axis accelerometer/gyroscope and temperature sensor to accurately measure movement: make step counters, fall sensors, door opening alarms, etc.
Communicate directly with your phone or tablet via BLE: send sensor information or build a remote controlled robot! Arduino

Product: ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino Clear prints on the female header connector, more precise and easier to use the wire.
The ELEGOO UNO R3 BOARD now uses an 16U2 instead of the ATMega8U2 chip. Faster transfer rates and more memory.
Control using ATMEL ATMEGA+328P chip(the same with Arduino UNO R3)
100% compatible with the Arduino IDE and RoHS Compliant
We have always cared about the customer experience and improve the product function details. ELEGOO