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Intelligent Light and Temperature Sensitive Switches for Automated Control Systems

Learn about how light-sensitive and temperature-sensitive switches work using transistors, LDRs, and thermistors to enable automatic lighting and temperature control. Find out the principles behind their operation and applications.

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Intelligent Light and Temperature Sensitive Switches for Automated Control Systems

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Presentation Transcript

  1. Transitors

  2. Light sensitive switch

  3. How it works • LDR • When the LDR is put in the dark the bulb lights up • Automatics lights at night

  4. Time delay switch

  5. How it works • The capacitor charges up slowly • It is several seconds before the voltage across it is high enough to switch the transistor on • The switch next to the capacitor when closed causes the capacitor to discharge • More capacitance – more delay

  6. Temperature sensitive switch • Resistance falls when temperature increases • Part of a potential divider circuit • At low temp the thermistor has high resistance • At high temp the thermistor has a low voltage • The transistor is switched on

  7. Temperature switch

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