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AVR 14 Pin 20MHz 8K 12A/D - ATtiny84
Price: $5.50
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Sparkfun Item #: COM-11232 -

The ATtiny84 is another of Atmel's little tiny 8-Bit Processors. 8K of program space, 12 I/O lines, and 8-channel 10 bit ADC. It will run up to 20MHz with an external crystal and can be programmed in circuit. Documents: Datasheet Product Card ATtiny Arduino Cores

AVR 28 Pin 20MHz 32K 6A/D - ATMega328P
OOD!
Price: $7.21
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Sparkfun Item #: COM-09061 -

Atmel's ATmega328P 8-Bit Processor in 28 pin DIP package. It's like the ATmega168, with double the flash space. 32K of program space. 23 I/O lines, 6 of which are channels for the 10-bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. 1.8V to 5V operating voltage! Documents: Datasheet Low Power Mode Tutorial ...

AVR 8 Pin 20MHz 8K 4A/D - ATtiny85
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Price: $5.50
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Sparkfun Item #: COM-09378 -

Atmel's itty-bitty ATtiny85 8-Bit Processor. 8K of program space, 6 I/O lines, and 4-channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. Documents: Product Card Arduino Board Definitions