New version changes:
1) Use Atmega16U2 chip instead of 8U2. Means higher transfer rate and memory.
2) No need to install drivers on Mac and Linux systems. (IDE driver is required in windows system)
3) Added SDA and SCL interfaces.
Function:
1. Pin changes: Two I2C pins (SDA and SCL, just a copy of Analog 4 and 5, not an additional I2C interface) are added next to the
AREF pin, and two pins are also added next to RESET, one is IOREF , which can make the expansion board adapt to the onboard
voltage. This pin only tells the expansion board what the current onboard voltage is (for example, UNOs is 5V, which can be
regarded as a copy of the power pin, and does not provide level pull-up), and the other is the future Standby pins to be used.
2. More stable RESET circuit. The position of the RESET button has also changed, and it has been moved to the corner of the board
near the USB interface, making it easier to press.
3. ATmega16U2 replaces 8U2, this does not mean that R3 with 16K flash can make your code run faster, this update is for the
service of USB interface chip, theoretically it allows UNOs to simulate USB HID, such as MIDI/ Joystick/Keyboard.
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