Logic Gates and Memory

Logic Gate Operation A logic gates senses inputs, in the form of voltage, and determines the output based on a predetermined set of rules

Gates The two most basic types of Gates are “OR” and “AND”

OR - Gates “OR” gates output a voltage if EITHER input senses voltage

AND - Gates “AND” gates output a voltage when BOTH inputs sense voltage

Wiring

Wiring For an “OR” gate, EITHER pins 6 or 7 being HIGH could turn on the LED For an “AND” gate, BOTH would need to be HIGH

Wiring Each Logic Gate chip contains multiple individual Logic Gates

Wiring

Wiring

Wiring

Wiring

Symbols Logic gate types can be shown using specific symbols

Logic Tables Every logic gate has a table summarizing its logic

NOTES A lack of 5V does not constitute 0V The output of one logic gate can be the input to another

NOTES Gates can be designed with multiple inputs

NOTES There are many ways to produce a gate’s inputs, such as a button, or Arduino pin

Complete the Logic Gate Lab

Memory

Memory How Flip-Flop Memory Works A voltage (HIGH or LOW) is placed on the ‘D’ pin When the ‘Clock’ pin goes LOW → HIGH, the state of the ‘D’ pin will be stored in the ‘Q’ pin