1. Stitching changes: beside the AREF are two extra I2C pins (SDA and SCL which are copy of Analog 4 and 5, not additional I2C interface). Beside the RESET also are two extra pins, one is IOREF which supports the extension board stand load voltage. The stitching just shows extension board the current on-board voltage. The other one is backup placeholder pins.
2. The RESET circuit is more stable. RESET button position is changed, and moved to near the USB interface of voids, which is more convenient.
3. ATmega16U2 replaced 8U2, but it does not mean that the 16k flash of R3 can make your code run faster. This upgrade works to the USB interface chip, which enables UNO simulate USB HID in theory, such as MIDI/Joystick/Keyboard.
General
Model
KIT02
Quantity
1Piece
Color
White + Light Blue + Multi-Colored
Material
Plastic + PCB
Specification
English Manual / Spec
No
Dimensions & Weight
Dimensions
5.91 in x 3.94 in x 1.77 in (15 cm x 10 cm x 4.5 cm)
Weight
10.58 oz (300 g)
Packing List
1 x Box 65 x Jumper wires 1 x Bread board 1 x UNO R3 board 1 x USB cable (61cm) 1 x 9V battery pack 1 x infrared remote control (Include 1 x CR1220 cell battery) 1 x 74 hc595 chip 1 x 4 digital tube 1 x 5V buzzer 1 x IR receiver sensor 1 x DS18B20 temperature sensor 1 x Photoresistor 1 x 1 digital tube 1 x 10k potentiometer 1 x 8*8 dot matrix LED screen 5 x button switches 5 x 5 mm red led lights 5 x 5 mm green led lights 5 x 5 mm yellow led lights 3 x 10 uf electrolytic capacitor 10 x 10 k resistor 10 x 1 k resistor 10 x 330R resistor
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