Logic gate
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This presentation discusses basic logic gates used in digital electronics. It explains that a logic gate either allows a signal to pass through or stops it, and there are three main types: AND, OR, and NOT. Examples are given for each gate, such as an OR gate triggering a doorbell if either the front or back doorbell switch is pressed, and an AND gate activating a burglar alarm only if both the person sensor and alarm switch are on. A NOT gate inverts the input signal.
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Logic gate
- 1. Presentation 153-19-1822 A B D U L L A H - A L - M A M U N Department Of ETE Digital Electronics
- 2. LOGIC GATES AND GATE OR GATE NOT GATE
- 3. A logic gate is a digital circuit which either allows a signal to pass through it or to stop it. There are three basic logic gates: AND, OR and NOT. AND GATE OR GATE NOT GATE
- 4. OR GATE A B X INPUT OUTPUT INPUT The output will be positive (True) if at least one input is true.
- 5. OR GATE Front Doorbell Switch Back Doorbell Switch Doorbell ON/OFF ON/OFF ON/OFF If either the Front Doorbell Switch OR the Back Doorbell Switch is pressed then the Doorbell rings.
- 6. AND GATE A B X INPUT OUTPUT INPUT The output will be positive (true) when both inputs (the input one AND the input two) are positive (true).
- 7. AND GATE Person Sensor Alarm Switch Burglar Alarm ON/OFF ON/OFF ON/OFF If both the Person Sensor AND the Alarm Switch are on then the Burglar Alarm is activated.
- 8. NOT GATE A XINPUT OUTPUT A NOT gate (inverter) has only one input. It reverses the logic state.
- 9. NOT GATE Temperature Detector (Above 20°C) Central Heating ON/OFF ON/OFF If the temperature is above 20°C then the Central Heating is switched off. If the temperature is below 20°C then the Central Heating is switched on.
- 10. Thank You For Your Time