LOGIc gates Objectives: George Boole, ( )

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LOGIc gates Objectives: George Boole, (1815-1864) To understand the functions of logic gates. To apply gained knowledge and design your own girlfriend or boyfriend chooser using the logic gates. George Boole, (1815-1864) About G. Boole: http://www.google.co.uk/imgres?imgurl=http://library.thinkquest.org/C0126120/boole.jpg&imgrefurl=http:// http://www.kerryr.net/pioneers/boole.htm

A logic gate is a digital circuit which either allows a signal to pass through it or to stop it. There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR. NOT GATE OR GATE AND GATE http://www.kpsec.freeuk.com/gates.htm Note that logic gates are not always required because simple logic functions can be performed with switches or diodes:Switches in series (AND function)Switches in parallel (OR function)Combining IC outputs with diodes (OR function) Did you know? Logic gates allow the computer to do things such as add, divide, multiply, do simple yes and no reasoning in certain situations along with other things.

ON/OFF ON/OFF ON /OFF Input Y = A OR B OR Output Input OR An OR gate can have two or more inputs. The output will be positive (True) if at least one input is true. Y = A OR B OR GATE Output Input ON/OFF ON/OFF FRONT DOORBELL SWITCH OR GATE DOORBELL BACK DOORBELL SWITCH ON /OFF The output is "true" if either or both of the inputs are "true." If both inputs are "false," then the output is "false.” It is doesn’t matter if one input will be off- the output will be on http://www.kpsec.freeuk.com/gates.htm

ON/OFF ON/OFF ON /OFF Input AND Output Input AND BURGLAR ALARM GATE An AND gate can have two or more inputs. The output will be positive (true) when both inputs (the input one AND the input two) are positive (true). Y = A AND B Input AND GATE Output Input ON/OFF c ON/OFF MOTION SENSOR AND GATE BURGLAR ALARM ON SWITCH FOR ALARM The output is "true" when both inputs are "true.” Otherwise, the output is "false." If one input will be off – the output will be off as well. http://whatis.techtarget.com/definition/0,,sid9_gci213512,00.html ON /OFF

To add more sensors to alarm GATE AND BEDROOM SENSOR FRONT ROOM BURGLAR ALARM ON SWITCH FOR ALARM ON or OFF ?

ON OFF NOT Output Input CENTRAL NOT HEATING A NOT gate (inverter) has only one input. It reverses the logic state. Y = NOT A NOT GATE Input Output NOT GATE HEAT DETECTOR (ABOVE 20 C) CENTRAL HEATING ON OFF NOT gate has only one input. It reverses the logic state. If the input will be on – the output will be off If the input will be off –the output will be on.

ON OFF Is the Final Output ON (True) or OFF (false) ? OR AND GATE AND NOT ON OFF FINAL OUTPUT ON ? OFF ?

Test 1: ? ? ? ? ? ? 1. 4. ON OFF ON OFF 5. 2. ON ON OFF 6. ON OFF 3. 1- off, 2- on, 3-off, 4- on, 5-off, 6-on 3. ? ON OFF Is the output ON or OFF ?

Test 2: ? ? ? ? Is the output ON or OFF ? 7. 10. OFF ON ON OFF OFF 8. 9. ON ? ON 7- on, 8-off, 9-off, 10- on ON ON ON ON Is the output ON or OFF ?