Hardware I2C / SPI capability for breakout & sensor interfacing. The 2 shared I/O pins have 2 more analogue inputs and one more PWM output. The 3 independent I/O pins have 1 analogue input and 2 PWM output as well. On-board green power LED and red pin #1 LED - Reset button for entering the bootloader or restarting the program - 5 GPIO pins - 2 shared with the USB interface. Up to 16 V input, reverse-polarity protection, thermal and current-limit protection.
Whats on board? - Dimensions: 27 x 15 x 4 mm - ATtiny85 on-board, 8K of flash, 512 bytes of SRAM, 512 bytes of EEPROM - Internal oscillator runs at 8 MHz, but can be doubled in software for 16 MHz (only with 5 V version) - USB bootloader with LED indicator - Micro-USB jack for power and/or USB uploading - Roughly 5.25K bytes available for use (2.75K taken for the bootloader) - On-board 3.3 V or 5.0 V power regulator with 150 mA output capability and ultra-low dropout.
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