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Feature:

1. PIN CHANGES: Two I2C pins are added beside the AREF pin (SDA and SCL are just a copy of analog 4 and 5, not an additional I2C interface)
2. ADD TWO PINS BESIDE RESET: In addition, two pins are added beside RESET, one is IOREF, which can let the expansion board adapt to the on board voltage. This pin just tells the expansion board what the current on board voltage is (for example, it is 5V, which can be regarded as a copy of the power pin, and does not provide level pull up), and the other is placeholder pins for future use
3. MORE STABLE RESET CIRCUIT: The position of the RESET button has also been changed, and has been moved to the corner of the board near the USB interface, making it easier to press
4. BETTER CHIP TO SIMULATE USB: Replaces for 8U2, this does not mean that R3 with 16K flash can make your code run , this update is for USB interface chip, theoretically it can simulate USB, such as MIDI, Joystick, or Keyboard
5. ENVIRONMENTALLY FRIENDLY MATERIAL: Made of resin material, possess heat resistance, low temperature resistance, environmentally friendly

Specification:

Item Type: Open Source Controller Development Board
Material: Resin
Input Voltage: 6-12V
Working Voltage (output current): 5V (500mA)
3.3V Maximum Output Current: 150mA
Main Frequency: External crystal oscillator 16M
Flash: 32K (0.5k for boot)
SRAM: 2K
ERROM: 1K
Number of Digital IOs: 14
PWM: 6
ADC: 6 Channels 10Bit
Reference Voltage And Accuracy: 1.1V±0.2%
DAC: None
I Or O DC Output Capability: 20mA
For Bootloader Burning Method: SPI

Package List:

1 x Open Source Controller Development Board

1 x Connecting Cable

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