Keyestudio REV4 is a microcontroller board based on the ATmega328. It includes 14 digital input/output pins (with 6 capable of PWM output), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. This board contains everything necessary to support the microcontroller; you just need to connect it to a computer via a USB cable or power it using an AC-to-DC adapter or battery to get started.
One key difference of the REV4 from previous models is that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2, which is programmed to act as a USB-to-serial converter.
Features
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1. Microcontroller core: AVRmega328P-PU ( Processing speed 20MIPS)
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2. Working voltage: +5V
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3. External input voltage：+7V~+12V（suggest）
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4. External input voltage ( extremum ): +6V≤ Vin ≤ ＋20V
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5. Digital signal I/O interface: 14 ( 6 PWM input interface)
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6. Analog signal input interface: 6
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7. DC I/O interface current: 40mA
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8. Flash capacity: 32KB( other 2k used in hootloader)
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9. SRAM static storage capacity
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10. EEPROM storage capacity: 512bytes
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11. Clock frequency：16MHZ