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Those citizens pushed the nation forward into the most integrated and powerful “super power” in the World. The foundation for the UGRR was a systematic and persistent fight by brave citizens who were destined to abolish enslavement in America. The Hockessin Heritage Foundation created a top eight list of sites likely used in the UGRR by their owners and workers to free enslaved Americans. Although Hockessin’s role in the Underground Railroad has eluded our text books, the foundations of the UGRR are easy to see. The Underground Railroad (UGRR) was a network of secret routes and safe houses used by 19th-century enslaved Americans to escape to freedom. Hockessin Heritage lists the top eight sites in Hockessin where abolitionists lived and were likely part of the Underground Railroad. (1<is written in C and compiled with AVR-GCC compiler(WinAVR). Let’s write a simple example of using the AVR comparator module. If Multiplexer is enabled (bit ACME in SFIOR register) and ADC is off, then MUX2.0 in ADMUX register selects the input pin(refer to datasheet). The second comparator pin can be connected to any pin where ADC input is by using a multiplexer. Then positive input of the comparator becomes 1.23V. As I mentioned, the comparator can compare voltage to reference voltage if bit ACBG is set.

Also, interrupt from the comparator should be disabled. If the comparator is not used ACD bit should be set to 1 because it will reduce power consumption. The result is stored in ACSR register bit ACO.

If the voltage in input of AIN0 is bigger than in AIN1, then the result of comparing is equal to 1 and 0 otherwise. In general Comparator, the module is a simple comparator. 0 – AIN0 to the positive input of comparator 1- reference voltage to positive comparator inputĬonnect comparator to timer/counter T1 (1- connected, 0-not)