AVR 14 Pin 20MHz 8K 12A/D - ATtiny84
Cost: $2.95 each
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Description: 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.