Microchip ATtiny85-20PU, an 8-bit AVR microcontroller rated to 20 MHz in an 8-lead 0.300-inch PDIP package.
| Pin | Position | Type |
|---|---|---|
| PB5 (RESETADC0dWPCINT5) | 1 | Analog, Control |
| PB3 (ADC3CLKIXTAL1PCINT3) | 2 | Signal |
| PB4 (ADC2CLKOXTAL2PCINT4) | 3 | Signal |
| GND | 4 | Ground |
| PB0 (MOSIAIN0OC0AOC1ADIPCINT0) | 5 | Analog, Signal |
| PB1 (MISOAIN1OC0BOC1BDOPCINT1) | 6 | Analog, Signal |
| PB2 (SCKUSCKSCLADC1T0INT0PCINT2) | 7 | Analog, I2C, Signal |
| VCC | 8 | Power |
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