Truth tables AND Gate Input 1Input 2 00 10 01 11 output 0 0 0 1 ? ? ? ? Input 1Input 2 00 10 01 11 output ? ? ? ? 0 1 1 1 OR Gate.

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Presentation transcript:

Truth tables AND Gate Input 1Input output ? ? ? ? Input 1Input output ? ? ? ? OR Gate

Truth tables NAND Gate Input 1Input output ? ? ? ? Input 1Input output ? ? ? ? NOR Gate

INPUTPROCESSOUTPUT ThermisterLOGIC GATES Buzzer LDRBulb Switch PARTS OF A SYSTEM

Simple system – Alarm when it is hot and a window is closed Push Switch Down = ? Up = ? Thermister Hot = ? Cold = ? Down = 1 Up = 0 Hot = 1 Cold = 0 Gate? Buzzer

Simple system – Alarm when it is COLD and a window is closed Push Switch Thermister Down = 1 Up = 0 Hot = 1 Cold = 0 Gate? Buzzer

The most complicated diagram you could be asked Thermister On/off Switch LDR Light a bulb when it is HOT and DARK and a swtich is turned on Hot = 1 Cold = 0 Light = 1 On = 1 Dark = 0 off = 0 First step? Second step? Last step?

The Bistable or Latch gate You are only ever expected to say how it works like this: 1. When SET becomes on the output switches ON…….. SET RESET output 2. Even if SET becomes off the output stays ON 3. If the RESET becomes on the output becomes OFF